September 1997 Page 1 | |||
The OFFICERS: | |||
President:
Ken Myers 1911 Bradshaw Ct. Walled Lake, MI 48390 Phone: (248) 669-8124 |
Vice-President:
Richard Utkan 240 Cabinet Milford, MI 48381 Phone: (248) 685-1705 |
Secretary/Treasurer:
Debbie McNeely 4733 Crows Nest Ct. Brighton, MI 48116 Phone: (810) 220-2297 | |
Board of Directors:
Jim McNeely 4733 Crows Nest Ct. Brighton, MI 48116 Phone: (810) 220-2297 |
Board of Directors
Jeff Hauser 18200 Rosetta Eastpoint, MI 48021 Phone: (810) 772-2499 |
Newsletter Editor:
Ken Myers 1911 Bradshaw Ct. Walled Lake, MI 48390 Phone: (248) 669-8124 | |
Ampeer Subscriptions
are $10.00 a year US & Canada and $17 a year world wide. |
The Next Meeting
Date: Thursday, September 4 Time: 7:30 or ASAP The Rushton Rd. Flying Field, South Lyon, MI Located between 9 Mi. & 8 Mi., east side of Rushton | ||
Ken,
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What's in this issue? --- Seniorita Mods - .pdf tip/battery tip/all up/last down? - 10 Inch Props - High Resolution Tach (cont.) - Seniorita Power - Double Impact - Lehigh Valley Meet/TS power - Gulf States E-fly Info - Aveox responds to Bob Jacquot’s letter - Some "Tailless"News - ElectroStreak Rating - Upcoming Events |
September 1997 | Page 2 |
The specs of the plane are: Motor Astro 25G, Prop MA Electric 11x9, Weight 96 oz., Battery 16 1700mAh, Speed Control Astro 210, Radio Futaba 4 ch FM (3)S148 servos 500 mAh Rx battery. The mods on the fuselage: I left out all the heavy stuff in the front of the fuse. The basic stick frame is sheeted with 1/16th back to the back of the cabin area. The fuse is the same size until the back of the wing where it begins to taper to a point at the rudder hinge line. Just put the fuse over the plan and shorten the cross pieces as needed. I tried to maintain the same downthrust as the plan shows and I used an Astro round mount bolted to the firewall. It also has a bit of right thrust. The landing gear is mounted so the axle is right on the leading edge of the wing. The way the the wing was built: I think barn door ailerons are nice. Build the wing main panels as the plan shows. Do what you want with the wingtips. I cut down the center 3 ribs so that I could sheet them to handle the wing bolts and heavier airplane. Now decide how big you want the ailerons. Mine are about 3 to 3.5 inches wide and 4 ribs bays long. With a razor saw, cut the ribs straight (perpendicular to the bottom of the rib). Cut the trailing edge just inside the ribs that are not part of the aileron. You will now have to add the aileron ribs and reinforce them so the covering doesn't cause them to bend. I also reinforce the wing ribs at the trailing edge for the same reason. You will now have to glue a 3/16 to 1/4 inch balsa piece to make the hinge area to the back of the wing. In order to have the aileron fit properly the thickness of the the two balsa pieces must also be cut from the front of the aileron ribs. Make sure you cut the aileron ribs on about a 60 degree angle for clearance. The hinges are then put in at the very top of the surface. I use Sig easy hinges and put them in at about a 30 degrees down angle into both the wing and the aileron. Flying The most enjoyable time I have is in flying. I have been flying the Seniorita for about 3 years now and it still looks about the same. The wing sits just a little crooked and I am always going to fix it later. It still flies very well. I have noticed that with the lower amount of dihedral to make a nice scale looking turn I have to use a bit of rudder. As well I have to use the |
rudder when I am increasing power from a dead stick glide. I have flown with many different propellers, and my particular favorite is not the size one would think to be the best. I have found that I like the most pitch in a propeller I can get. I like to prop an electric to about the maximum load or maybe even a bit more on the ground and then I try to stay below full power as much as possible during the flight. I then know that I am able to use the system's maximum power if needed. I have learned that with electric flight, you must manage the power. At most flying fields, watch how the guys with glow engines mostly fly around under full power for about 10-15 minutes and then land. Well we quiet guys know that at full power the best electric can go for about five minutes. Also note that most glow fliers are excited when they have enough power to go out of sight vertically. We all know that unless we are talking about the F5B stuff, vertical is "Hey, it can loop from level flight." I always say, if you want extreme power get wet. Now where does that leave electrics. I have taken about 3 years to learn how to fly the electric at all times at the power level required. It takes quite a time to get used to the fact that when I shut the throttle down it will absolutely come back up if needed. Many of the glow flyers leave the throttle open because the engine will die if the throttle is changed. I now only use full power when required; take offs, hammerheads, loops. Just by power management awareness, the Seniorita flies for maybe 3 to 5 minutes longer doing the same basic maneuvers that the wet guys think are so important. Please don't misunderstand me. I love all things that have wings and fly, no matter how they are powered; glow, electric, rubber, CO2, thermal. It is just that with the Seniorita, I think electric is very compatible. Hello Mr. Myers, My name is Martin Vargas. I wrote to you some time ago about trying to print "PDF" files from your Website and the problems I had. I have discovered some things that may be useful for all that |
September 1997 | Page 3 |
use your Website. 1) I was using Acrobat Ver. 2.1, this version doesn't print the pictures, tables or graphs. All you get are "Big Black Ink Blocks" where the graphic should have been. I tried it with all kinds of printers, all with the same result, so only use version 3.0. (I find this odd, since I use Acrobat Exchange 2.1 to publish and view my own work on and off line, but if you are having a problem like this, you might want to try version 3 of the Acrobat Reader. I have found that the printer setting must be set up correctly for graphics, and then it works just fine. The paper version is printed from the Acrobat version. By the way, do you realize the .pdf version is indexed? On the tool bar, click the second icon from the left. That will give you the index. km) 2) In your Ampeer JUNE '97, Mr. Bernard Cawley said he was very interested in obtaining "N-1250SCR" NiCads from B&T R/C Supplies. Panasonic has made 1200 N size (The call it "2/3 Sub C") for the last 5 to 6 years. It came out when the red SCR cells came out. These cells are of a SCR type. (They don't call them that.) They call them "High Rate Discharge & Rapid Charge Types". They are available from Digikey Catalog Sales (A big, hard-core electronics mail order catalog out.) By the way, I am a power electronics engineer. I work with batteries, MOSFETs & etc. There phone number is (800) 344-4539. Minimum order is $25.00. The cells cost $5.16 ea for 1-9, $4.65 ea for 10-29 and $136.29 for a 30 piece package. They are out of Minnesota. They take credit cards of all types. They do not charge freight if you send a check. There address is 701 Brooks Ave. South, P.O. Box 677, Three River Falls, MN 56701-0677 I bought my first 7 cell pack 5 years ago. I still use it in my Eclipse (Airtronics). These batteries are plain-wrapped. The part # for the battery is P232-ND on page 416 in the April/June catalog. This catalog is FREE, even if you don't order. Folks who are using 8 "A size" or the 1000 2/3 sub C should switch to this cell. The weight for each cell is 1.38 oz. 3) This is my comment about electric contests or fun flies. I have been doing this hobby for 18 year. I am an old fashion kind of modeler. I don't use CA glue, |
mostly white glue. My models are painted, (plastic film cracks and fades badly after 3 or 4 year.) I work with all kinds of new concepts, ie. vacuum bagging, foam, cardboard, etc. I have had 8 to 10 crashes in my time, but my models just start to wear out. I fly everything; 1/3 scale sailplanes, 1/4 scale gas, pattern, free flight rubber, rudder only R/C, and electrics - large scale through Speed 400, you name it... The issue of the All up/Last down came up when I went to KRC '96. I thought All up/Last down should be done on pilot skill, not on how long can you throttle your plane to get maximum flight time or what kind of power system you engineered to get the duration. On that day, at KRC, this was my first time to an electric fly. I go to the meet...I am going to see electrics at their best, and then I see all these sailplanes. I go "What's this, a thermal contest?"...This event should be radically changed. It must have continous motor run, not who has the best sailpalne, or who know how to thermal. I hope this changes in the future. I also spoke to Mr. Bob Kopski. He agreed also. 4) Finally, I am making a Speed 400 controller for the use with 4 or more cells with a BEC. It will have a switching power supply that will step up the voltage to 5v when the motor battery is lower than 5v to a minimum of 3.3v and yet step down the voltage when the voltage is higher, due to freshely charged pack or larger amount of cells. It will be fully isolated source to the radio. It will have motor cut off with also a brake and it will be cheap. It will be solder on to the back of the motor type. This controller will permit you to use 800AR for Speed 400 pylon. The weight of 4 "A size cells", compared to six or seven cells of the 500AR size will be about the same. The controller will be available in late summer, in time for KRC... I greatly appreciate you putting up this site. It takes hours to go through everything on your site. Your Ampeernewsletter is top notch. The information is priceless. The format well thought out. I hope the info I gave you will help you. Thank you, Martin Vargas |
September 1997 | Page 4 |
Why does it seem like everyone ignores the 10" prop for use with a reducer? (See the info on my TigerShark in the August issue of the Ampeer. km) I am running a Master Airscrew 05 with 2.5:1 box and a M.A. 10x8 nylon prop. I originally picked the prop because it was not too large for my Modified CG Mirage 550. I got a shareware timed copy of Motocalc and it confirmed that a 10x8 was the best prop for the motor/gear drive I was using. Why is a 11x7 always recommended over the 10x8? (It isn’t. When a 3:1 ratio is used on a glider type, or when more thrust is needed on a slow flying sport plane, then some will recommend the 11x7. The folks at Model Electronics Corp. extract a great deal of power on sport planes by using a 13" prop, but for the size of the planes they are using these on, landing gear must be left off. km) Also, I see people always recommending the 3.0:1 box. My Mirage is 46 oz. using the Futaba Attack E system and 3 133's on BEC. Has anybody done any comparisons between static and flight times? (With good power management on a sport plane, it is about double the time. kmThe Mirage seems to be extremely popular. I picked the original after seeing 2 in the same issue of MAN in the readers pics! I have read about dozens of them (Mirages) and they always pop up in the beginning electric article of electric homepages. My mirage can lift off in under 30 feet and runs for 4 minutes 14 seconds static with 7 1400 ma cells at 24+ ounces thrust (This indicates an average of about 20 amps - not a bad area to fly in if you are happy with the performance, and sounds like you are. km) By the way the turbo 550 (Mabuchi 540 SH I believe) seems to be nuetrally timed and really benefits from a 2.5 to 1 box. It's really close in performance to the M.A. motor, even with the stator ring left on. At $11.99 for the M.A. gear box in Tower Hobbies it should be recommended for all Mirage 550 builders as a modification. You have to raise the motor bearers about a quarter inch, and rebend the landing gear for an additional inch of height. Rubber band the motor to the bottom of the bearers. I also built mine with 1-1/2" ailerons, but you should use 1-1/4" instead. 1" ailerons don't seem to be large enough on the Mirage from what I have read, and mine are too |
sensitive. I must not have been careful enough when I built my ailerons, as the wing weighs 10.5 oz. about 3 oz. more than it should. Go with built up ailerons and be careful how you redesign the center wing section. I did not change the dihedral. I sent a letter to Goldberg and suggested they update the Mirage and they never responded. Guess they are resting on their laurels instead of looking to the future!
Specs for Richard’s Mirage 550: Span: 52" - Chord: 9.5" - Area: 494 ailerons added some area Weight: 46 oz Motor: Master Airscew 05 geared 2.5:1 Prop: MA nylon 10x8 (His Bee below) |
September 1997 | Page 5 |
(note: The first part of this information appeared in the June ‘97 issue of the Ampeer. Please also note that Tom’s e-mail address has been changed. km) For motor/reduction setups that spin props at 2000 to 7000
rpm's, 100 rpm resolution is unacceptable. Only one tach on the market will give better than an
unacceptable 100 rpm resolution, but it costs about $130.00. To avoid purchasing an expensive
piece of equipment that can only do one thing, I purchased a Digital Multimeter with frequency
measurement capability to serve as a high resolution tach. It is a Techtronix DMM870, but any
multimeter with frequency measurement capability will work. I simply use an NPN Phototransistor
with a resister and a single cell 3.6v lithium cell. This setup give me a tach with better than
1 rpm resolution.
Be careful to observe the correct polarity for the photo-transistor. As shown in the diagram all |
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September 1997 | Page 6 |
Steve cont. Thanks again for the recent Ampeer (again, I like the HTML format). I appreciate the work you've been doing on this publication. I did want to make a comment on something in the recent Ampeer, though. In a letter from Matt Dyer in Maine, he commented that he wants to build a Seniorita and wondered if he needed a 25 (apparently he has a geared 15), to which you responded "yep". I haven't owned or flown a Seniorita, but I understand they fly pretty well with a geared 15. But whether it flies well on the standard geared 15 or not, I was thinking that mating up his 15 with one of the new Astro superboxes would be cheaper and give him more torque than a geared 25, as well as being lighter (sounds like it would be a great choice for a slower, draggy plane like the Seniorita). Might be something for him to try if he doesn't want to invest in a new motor. (Interesting idea here, Steve. It probably will work. km) First off the wet design is a Dick Sarpolus orignal, the "Double Impact" published in Flying Models, 8/95. The span is 76" and wing area 1000 sq.in. The wet version weight is 8.5 lbs. and the electric 9.0 lbs. The electric’s wing loading is 20.75 oz./sq.ft. Wet version used two ST 40's, while the electric used two Astro 15G running in series on 24 1400SCR cells. Props are Master Airscrew 11-9 electric. (Bench data showed 7300 rpm at 27 A, or 720 W input for two.) |
These are the weights of things for the electric: Framed up and covered aircraft --- 51 oz. Motors --- 17 oz. Battery --- 48 oz. Receiver battery --- 03 oz. Servos --- 06 oz. Speed control and receiver --- 3.5 oz. props, spinners wheels, etc. --- 15.5 oz. Total --- 144 oz. The electric version flies well, nothing marginal about the power, even at 7000 ft. altitude. When I build another, I believe I will have the design of the fuselage and nacelles the same as the wet version. I have thought of splitting up the battery pack so that six cells are in each nacelle and 12 in the fuselage, this will permit that design and will also have the advantage of spreading the battery weight around. Hi Ken,
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September 1997 | Page 8 |
geared (must have 2.3mm shaft and non-replaceable brushes....maximum 7 cells.) Ninety seconds will be allowed for the motor run and the task will be eight minute precision duration flights and spot landings. We also have two All-Up-Last-Down events. One will be for Half A Sailplanes and the other will be Anything Goes. We have awards for the Best Scale airplanes. Models will be judged so bring some documentation if you have it. On Sunday we will be judging the most impressive aircraft and we have a special award for the person who travels the farthest. Please plan to have dinner with us on Saturday evening. Our Cajun Cook-out is free to all participants, their families and helpers. New Flying Field For eight years we have enjoyed flying at the Louisiana Polo Field in Folsom, Louisiana. Recently we were informed that the property was being sold for development into home sites. Fortunately we have found another field, comparable to the Polo Field. The new site is known as the Covington Model Airport. The Ozone R/C Club is leasing the field from the City of Covington. The grounds are unobstructed, high and dry and easy to get to. We need to do a little work on the grass, but it should be in good shape for the event. The facility even includes a thirty-five foot by three hundred foot pond that looks perfect for float planes. To locate the new field travel north of Covington on Highway 25. One and seven tenths miles past the intersection of Highway 190 you will find M.L. Planche Road. Turn left and follow the road eight tenths of a mile to the gates of our new field. Southern Electric Championship Presented to the High Point contestant of this event and the Deaf Electric Fly-In, this is one of the most prestigious awards in electric competition. AMA Rule Book events and All-Up-Last-Down (Everything goes) are included in the scoring. (Half-A Sailplane LMR and Half-A Sailplane All-Up-Last-Down are not included.) NEAC Electric Achievement Award The National Electric Aircraft Council, our special interest group that represents us to AMA, is sponsoring a special award at this year's event. |
"What we are looking for is an exceptional modeler with an exceptional model." "This could very easily go to a very young or new-to-the-hobby person; someone who has made great strides in a short time, or someone whose long-term contributions have been especially supportive of electric flight, said Doug Ward," NEAC President. The decision will be made by NEAC representatives at the meet. Saturday's Schedule Fun Flying all day Class A Sailplane LMR (Event 610) Awards to 3rd Place Half-A Sailplane LMR (Speed 400 type) Awards to 3rd Place Scale Demonstration Flights All-Up-Last-Down (Half-A Sailplane) Contestants may have to qualify for frequencies. Cajun Cookout Free to Entrants their Families and Helpers Fun Flying all day Class B Sailplane LMR (Event 612) Awards to 3rd Place Class B Old Timer LMR (Event 620) Extended motor run for 7 cell entrants Awards to 3rd Place Scale Awards to 3rd Place All-Up-Last-Down (Anything goes) Contestants may have to qualify for frequencies. Paul Perret, 1780 Prytania Street New Orleans, LA 70130 (504) 524-3442 PaulCPerret@worldnet.att.net or Ben Mathews, 101 Mulberry Drive Metairie, LA 70005 (504) 833-5589 Benmat@worldnet.att.net Registration Fee: $25 or Preregistration: $20 Mail Preregistration to Ben Mathews I received the following information from Matt Orme near the end of June, but because of having the July Special Edition and August issues |
September 1997 | Page 9 |
already printed, I could not get it to you sooner. Those of you on the WWW should be aware of this information by now, as it has been posted on the EFOsite since I received it. In reprinting the letter from Watts current, please note my notes about AVEOX being a top notch supplier! I tried to guess what might have happened, but here is a more likely possibility from Matt: (818) 597-8915, 31324 Via Colinas, #104 Westlake Village, Ca 91362, Fax:(818) 597-0617 Our arrangement with robbe, as our exclusive European Distributor, at the time this occurred (he was referring to no response to Bob's request for information km), was that we would sell no Aveox products into Europe, and direct all European inquires to them for follow up. Any European faxes, e-mail, or letters were immediately forwarded to robbe for a response. We had no way to follow up with robbe regarding the customers, as our agreement precluded it. My guess is that Mr. Jacquot was not happy with the European price schedule, but we were precluded from servicing any European customers at that time. That situation has now changed somewhat, as robbe still has the exclusive for the Germanic countries, but we can sell into them and credit robbe with the sale. The situation would be analogous to you calling Mercedes in Germany and discussing retail car sales to the USA from Germany. They would of course tell you to call your local Mercedes dealership. Thanks Matt for clearing it up! I really appreciate you taking the time to do so, which I knew you'd do! The following two items in parenthesis are taken from the July Ampeer, as a reminder as to what I said when I decided to print Bob's letter "IN PRAISE OF MAXCIM". (I am sure they do (need the business)). I'm not sure what happened, and why they (AVEOX) didn't respond. I've found them to be extremely responsive to modeler's needs and requests. They also have a virtual motor tester on their site where you can try out their motors with various cell counts, props and gear ratios. km) |
(Thanks Bob and Doug. I want it clearly understood that this letter was published IN PRAISE of Mr. Cimato. As I said earlier in my note, I have always found Brand-X (AVEOX) extremely responsive to modellers. It is my personal belief that this was an isolated case, so please be sure to contact all of the folks you wish to get info from, at least a couple of times. If you use e-mail and the system drops a packet somewhere, well, your message is gone. But, in praise of Mr. Cimato - Way to go Tom! :-) km) Finally, we are truly blessed to have THREE excellent power systems MADE in AMERICA and four excellent individuals backing them up. They are responsive to our needs and wish to support their products to the fullest. My thanks go out to Dave & Matt, Bob and Tom. I appreciate your hard work and effort, and wish all of you continued successes. Be sure to check out all the information you need from these folks to make your next project "the best one ever." Buy and fly American. km (note: This was CCed to me, and address to Filippo km) Filippo,
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September 1997 | Page 10 |
Sanyos for the construction article. I have completed the framing of the aircraft and preliminary plans. I will complete the plane and flying tests followed by computer drawn plans and construction article. I expect to be complete around the end of July 1997. The reason for this plane was to design a simple to build Sunday sport flyer with plenty of performance. Plane Specifications: 11 inch average chord 20 oz weight without motor, battery or radio 60 oz all-up weight. 16 inches from rudder hinge line to the CG (good for aerobatics) Room for up to 18 cells (dynamite with an Astro 25 geared). Easy battery change through hatch on top of plane. 4 channel I will be selling plans for this plane when they are complete (They are km). Ciao, Carlo Ciarniello C-35 Centennial Drive, RR#1 Powell River, B.C., Canada, V8A-4Z2 |
Rating ** It was difficult to build because of the very small fuselage and unstable when flown. It is fast, so it crashes quickly! The only reason I didn't give it a single * is that it looked good when finished. September 20 & 21 Queen City Airport, Allentown, PA: KRC - setup on the 19th. For more info Anthony Assetto 102723.2566@compuserve.com or visit ourworld.compuserve.com/homepages/george_poos_2. October 4 & 5 11th Annual DEAF Fly-In, Dallas R/C Club Field in Seagoville Greg Judy (817) 468-0962 or 75267.224@compuserve.com October 17, 18 & 19 Gulf States Electric Fly-In hosted by the Ozone R/C Club for more info: Paul Perret 1780 Prytania Street New Orleans, LA 70130 (504) 524-3442 or PaulCPerret@worldnet.att.net or Ben Mathews 101 Mulberry Drive Metairie, LA 70005 (504) 833-5589 or Benmat@worldnet.att.net |
The Ampeer Ken Myers 1911 Bradshaw Ct. Walled Lake, MI 48390 |
To archive the Ampeer to your hard drive visit download.com and select Internet - Offline Browsers. I tried Internet Angel and then Grab-a-Site. I liked and can easily use Blue Squirrel's Grab-a-Site and recommend it. With this small program you can grab all of the infomation from any site, including the Ampeer. It took me no longer than ten minutes to figure out how to use the program and have the September Ampeer completely downloaded to my hard drive. I'll be using this program to download sites for my students to use in the classroom. There are many other choices to be found here for the many different operating systems. I don't know why I've never had a site grabber before!