Here is a picture of my Graupner CAP 232 that I just finished with a Thunder Tiger Pro 61 under the cowl. Anyone know of a good prop for this?

Try a 13X5 or 13X6 prop.

TT .61, 12X6 APC. Should pull it around just fine. Plane looks good! I have a 12X5 Zinger on mine for break in. Put it on a TT fun fly. Seems like a nice powerfull motor. Have you flown it at all yet?

Thanks BDTSR,
The CAP hasen't been in the air yet, I just took it off the work bench today. The engine has about an hour run time on it and it runs good. I have a 12x6 and also a 13x6 as LuvBipes sugested so I will try them both. I am waiting on the mailman to bring my pitts muffler for it so I should be able to maiden her next weekend.

I also have a Graupner Cap 232 with an Os Fs 91 for power. I flew mine several times before I crashed it. Be careful with this cap, as it wants to drop a wing and go in a death spin. The Thunder Tiger is even heavier than the Os 91 so be careful and don't slow down the plane too much. Try to keep a high speed while flying. Here's the thread of my crash:
http://www.rcuniverse.com/forum/m_12...tm.htm#1229800

Chris

Chris, sorry to hear about your CAP! Thanks for the advice I will watch the speed. I hope to have her in the air this weekend.

Did you fly it yet?
Chris

Chris,
I read your description of the crash. I would speculate that it had to much elevator combined with being heavy and a rearward CG. The elevator throw is the most critical factor here and many Cap's will snap if the wing's angle of attack is exceeded.

Whenever I hear someone explain that the plane flipped over and they had no control till it crashed I assume this is the cause. Usually they will blame a radio hit because of the seemingly lack of control because they kept pulling up and nothing happened. Actually the wing stays in a stall and does not get a chance to begin flying again. What needs to be done is to neautralize the sticks and add a little throttle, wait a few beats and then slowly pull elevator, hard to do when your plane is heading straight for the ground.

I would guess that this plane only needs 1/2" of elevator throw on low rates, maybe less.

Hi Chris, I only got to fly her one time. She flys nice but it is a CAP and she will eat your breakfast while your still stirring your coffee if not careful. I agree with BasinBum on the wing stall. You have to get the stick forward to get the wing flying again, hard to do on the ground but even harder to do sitting in the cockpit when the windscreen is full of ground. For my first flight I have my elevator travel set at 15mm high and 10mm low rate. The book calls 35mm but I like to keep my low until I get use to the plane and figure out what she likes and does not like. My CG is 83mm aft of the leafing edge. I hope to get to fly it again next week.

There is in fact no reason to have 35mm for the elevator. This is way too much, and the maximum I use is probably 10mm. As for the wing that stalls, will a backward center of gravity help prevent that a little bit? Or is it just speed that I have to keep up all the time? When I stalled I was probably at one fifth of the throthle with my os Surpass 91 turning a 14*6. Is that normal?
Chris

Chris,
While going to slow will certainly cause a tip stall the Cap should have good slow speed charecteristics. Moving the CG aft will make the plane less stable not more and is good for snap rolls and flat spins but not landing or stall characteristics. The other major factor here is wieght and wing loading and depending on the plane itself I would recomend getting rid of anything possible to save wieght. A wing loading of more than 25 oz. will also give you problems where as under 20 and it would fly like a butterfly.