| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 227.1 | | SPKALI::THOMAS | | Fri Jul 24 1987 15:02 | 7 |
| I wouldn't think that ship would come out tail heavy. Tell us,
what your servo installation looks like? Where are the servos,
battery and receiver. Also, where are you balancing the ship from
IE, Dimension from the leading edge of the wing. Any other
specifics that you can give may help/
Tom
|
| 227.2 | PT BALANCE PART II | DARTH::GAROZZO | | Fri Jul 24 1987 15:23 | 7 |
| I FOLLOWED THE DIRECTIONS TO A T. THE BATTERY IS IN BACK OF THE
"F2" WALL, FOLLOWED BY FUTABA S38 SERVO'S, THEN THE RECEIVER. ALL
NICE AND CLOSE TOGETHER. THE PLANS CALL FOR TAKING THE MAIN LOWER
WING SPAR AND MEASURING BACK 1/2 INCH. THATS THE BALANCE POINT.
IT DID SEEM STRANGE TO ME ALSO THAT IT NEEDED WEIGHT. I PUT THE
WEIGHT UNDER THE HATCH BUT SINCE HAVE LEARNED THERE ARE PROP WASHER
WEIGHTS THAT CAN BE USED. IT GOES TOMORROW!
|
| 227.3 | I have one also. | GOLD::GALLANT | | Mon Jul 27 1987 13:14 | 13 |
|
I also built a PT-20 but had just the opposite balance
problem. I first built it with the battery under the fuel tank
and used thier wooden servo tray. just beyond the servo tray
I installed the radio. I turned out to be nose heavy. I then
moved the batteries to just aft of the servo tray and the radio
just aft of that. That fixed my problems. From what you said
about the point at which you are trying to balance it I would
say you have the correct spot. What size engine are you using?
Explain a little beter where the batteries are, and radio.
Michael Gallant
|
| 227.4 | BALANCE III | DARTH::GAROZZO | | Mon Jul 27 1987 15:18 | 6 |
| I AM USING A ENYA 15 ENGINE. VERY LIGHT. THE BATTERY IS JUST IN
BACK OF THE F2 WALL NOT UNDER THE GAS TANK. THEN THE SUPPLIED SERVO
TRAY, THEN RX. THE ONLY OTHER THING I COULD THINK OF IS I PUT SOME
ICE POP STICKS ABD GLUED SOME TO FUSALAGE SIDES TO STRENGTHEN THEM.
I THINK ITS MOSTLY A LIGHT ENGINE AND BATTERY TO REAR OF F2 FIRE
WALL. WHAT DO YOU THINK AND THANKS IN ADVANCE FOR RESPONDING.
|
| 227.5 | Its the engine | BZERKR::DUFRESNE | VAX Killer - You make 'em, I break 'em | Mon Jul 27 1987 23:12 | 16 |
| The engine is problem the source of the problem.
I put a FOX 19 in mine and it can out on the money (although i've
been told it tends to be tail heavy when flying at low revs).
RCM review the model last month and complained about having to locate
the battery pack behind the servo tray. They used a K&B sporter
20. I undertand that engine is heavy. (form a previous review in
RCM).
PUt some lead in the nose (cave out the balsa in the engine section)
Warning: This plane glides real good..
md
|
| 227.6 | | SPKALI::THOMAS | | Tue Jul 28 1987 08:03 | 12 |
|
Before you go adding any weight put the battery under the fuel
tank. Then if that isn't enough put the RX in front of the servos.
Also add a spinner and prop to the engine prior to balancing.
Do everything you can to use the existing weight to balance the
plane before you add any weight. If after this it's still tail
heavy then add a propnut weight.
straight + light + HP = Good Flying Planes
Tom
|
| 227.7 | Check CG while building | LEDS::LEWIS | | Tue Jul 28 1987 11:46 | 8 |
|
Also a tip for the future... it sounds like you did the servo
and battery installation before checking the CG - saves time and
grief if you check the CG from time to time while building - you
might have put the battery farther forward for example, or sanded
more at the rear of the plane.
Bill
|
| 227.8 | I agree with Tom in .6 | GOLD::GALLANT | | Tue Jul 28 1987 13:46 | 8 |
|
With respect to .6, Tom is telling it straight. Put the batteries
under the fuel tank and move the radio up to the servo tray
at least before adding even a prop nut. Only add the prop nut
if it still doesnt balance.
Michael Gallant
|