trimming an airplane.. baffled as to why???????? - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-13-2006, 11:05 AM   #21
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lol well again, quite the topic......

Anyways, i was out last night, and I added some tail weight and it has improved some. I did manage a rudder turn and I was estatic.. it was great.

I do use a computer radio on this plane and I have yet to dial in mixing etc. I wanted to get things set up as close as possible before i started mixing.

Knife edge it still drops some, but i also think that the engine is not putting out the way it should. Been haveing to have to do way too much carb adjusting for my likeing. 40 size plane, but have a webra speed 61 in it.

It does wanna roll out in knife edge too, but that is probably more the plane design than anything. Still need some playin around with it.

Its interesting to note, the idea with an angle on the rudder. My buddy thought of that last night, and sugested a slight amount would probably do the trick.

I have wondered a lil bit if maybe a larger rudder would work too, but probably not.

I don't know who all is familiar with the plane and flown one. It is a tad short coupled i think. Its certainly not squirly like say a pitts, but compared to an old thunderbolt pattern ship i am flying as well, it is short.

It does hammer head fairly well, so that sorta tells me there is rudder athority there, and so the rolling outa knife edge and unable to hold the knife edge tells me maybe another problem, maybe right or down thrust or maybe an incidence problem as well.Or like I said, the engine is not putting out enough or maybe a lack of prop wash over the rudder.

When i first test flew it, i tried a bigger prop, and found i had tons of pulling power, but it also wanted to trun left all of the time. And it did not matter how much rudder i put in to try and straighten it out. A smaller prop fixed that problem.

So i'll keep playin with it and see what I can do.. And keep your comments comein guys... Any ideas big or small would be great.

And I would like to get this figured out, cuz I would like to build a bigger version of this plane. Mainly because, every body else has the caps, sukois etc.. but no one has a staud... and I like to be different :P
happy flying
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Old 09-13-2006, 04:28 PM   #22
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A bigger plane 25% or bigger would be night and day. I have yet to see a 40 size scale aerobatic plane that preformed well other than an ultimate. The staud looks very similar to an extra 260 with the main exception being the straight rudder
Read peter Goldsmiths trimming article. It will help allot.
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Old 02-14-2007, 07:42 PM   #23
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I am just getting back into R/C A/C, I flew from 1964 to 1980. I remembered that one of the designers would angle the rudder hinge line back 15 deg. or so to keep the nose up. Old problem old cure. CRS
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Old 02-14-2007, 08:08 PM   #24
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A bigger rudder would help to a point. A bigger rudder (moving the hingline) will allow the plane to be held at a potentially higher angle of attack in KE. The downside is it will make 4 points and slow rolls look funny because the plane kinda flops around. Ask me how I know
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