CG for Top Cap
11-15-2002, 12:17 AM
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CG for Top Cap
Hello, I'm just about finished putting my Top Cap ARF together and was wondering how far back you guys have taken the CG. I'm a good pilot, and love doing wild manuvers.
BTW, this thing seems pretty big for my 50SX. What engines are you guys using? I'm thinking I might have to upgrade to a 60, or maybe a 91.
Frank
BTW, this thing seems pretty big for my 50SX. What engines are you guys using? I'm thinking I might have to upgrade to a 60, or maybe a 91.
Frank
11-15-2002, 12:20 AM
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CG for Top Cap
Start at the recomended point. Some people think it flies tail heavy there.
I flew mine about 1/2" behind that point.
You wont need anything bigger than that .50 for this plane. Heavier motors will kill the performance.
The lighter the wing loading the better they fly.
I flew mine about 1/2" behind that point.
You wont need anything bigger than that .50 for this plane. Heavier motors will kill the performance.
The lighter the wing loading the better they fly.
11-15-2002, 04:20 AM
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Yeah, but...
What's the measurement...I got the one I traded for, but he pulled his battery and RX out. I might ought to check my CG before the first flight..
11-15-2002, 05:31 AM
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Same setup...
Frank,
I've got the exact same setup: a TopCap ARF with an OS 50. I'm switching to an OS 46. I don't need all the power of the 50 (I can't believe I'm saying that!) and more importantly, the 50 low and high-end needle essemblies drive me nuts. You can check out my TopCap with the 50 at:
http://archive.ncsa.uiuc.edu/Cyberia...rc_topcap.html
The 50 is tons of power... it hovers at 2/5 to 1/2 power. Climbing inverted spins are possible. But I'm going to a 46 for reliability and smoother transitions.
As far as the CG, 5 and a quarter inches back is fine. I maybe moving it back some tomorrow... also, Jeff Williams' carbon fiber gear are an absolute must. Don't hesitate; buy them. Take-offs will require 10 feet, landings will be even easier... etc etc.
-Juhan
I've got the exact same setup: a TopCap ARF with an OS 50. I'm switching to an OS 46. I don't need all the power of the 50 (I can't believe I'm saying that!) and more importantly, the 50 low and high-end needle essemblies drive me nuts. You can check out my TopCap with the 50 at:
http://archive.ncsa.uiuc.edu/Cyberia...rc_topcap.html
The 50 is tons of power... it hovers at 2/5 to 1/2 power. Climbing inverted spins are possible. But I'm going to a 46 for reliability and smoother transitions.
As far as the CG, 5 and a quarter inches back is fine. I maybe moving it back some tomorrow... also, Jeff Williams' carbon fiber gear are an absolute must. Don't hesitate; buy them. Take-offs will require 10 feet, landings will be even easier... etc etc.
-Juhan
11-15-2002, 08:51 PM
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jsonin
2 questions:
1. Which prop are you using with your .50? Mine is REALLY reliable, no problems at any throttle setting. I fly a 12x6 with it, but I'm only a few hundred feet above sea level.
2. Also, I set up my elevator throws last night, and quickly realized that I can't get what I would consider "3D" throws when the elevator goes down. It hits the Rudder linkages after about 2inches of deflection. OK, I know that 2 inches of deflection should be enough, but it's nowhere near 45degrees. How much deflection do you have?
Frank
2 questions:
1. Which prop are you using with your .50? Mine is REALLY reliable, no problems at any throttle setting. I fly a 12x6 with it, but I'm only a few hundred feet above sea level.
2. Also, I set up my elevator throws last night, and quickly realized that I can't get what I would consider "3D" throws when the elevator goes down. It hits the Rudder linkages after about 2inches of deflection. OK, I know that 2 inches of deflection should be enough, but it's nowhere near 45degrees. How much deflection do you have?
Frank
11-15-2002, 10:49 PM
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CG for Top Cap
The same thing happened to me. Some folks cut the offending piece and make it work that way (Ulf). I just made sure the two wouldn't touch (or lock up in the air - which I have heard of happening).
My personal plane is very ele touchy. I can snap out of a loop no problem. I'm actually either going to crank up my expo or lessen up my ele travel.
All that to say, I didn't need all of that travel on the TopCap.
My personal plane is very ele touchy. I can snap out of a loop no problem. I'm actually either going to crank up my expo or lessen up my ele travel.
All that to say, I didn't need all of that travel on the TopCap.
11-16-2002, 01:11 PM
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Re: Same setup...
Originally posted by jsonin
also, Jeff Williams' carbon fiber gear are an absolute must. Don't hesitate; buy the them
also, Jeff Williams' carbon fiber gear are an absolute must. Don't hesitate; buy the them
11-16-2002, 03:20 PM
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CG for Top Cap
Frank,
I'm using a 12x4 or 12x6 (usually a 12x4 APC). I'm sending back my 50... usually OS 50s are fantastic engines. I look forward to when it gets a manufacturer's tune-up.
Your two inches of down should be plenty. If you're worried about hitting the pull-pull/control horns on the rudder (when deflecting at 45 degrees), you'll have to slightly modify your elevator linkages and surface.... but so far, I've had no problems with the stock setup and performing 3D.
RC_Junky,
Check out the top page of http://www.the******************.com/ - they have Jeff's email. [Note: I don't want to publically publish his email here, just in case.] They elevate the nose another two inches from the stock gear making take-offs and landing so much easier... if they weren't easy enough with these profiles.. jeesh.
You'll love them.
-Juhan
I'm using a 12x4 or 12x6 (usually a 12x4 APC). I'm sending back my 50... usually OS 50s are fantastic engines. I look forward to when it gets a manufacturer's tune-up.
Your two inches of down should be plenty. If you're worried about hitting the pull-pull/control horns on the rudder (when deflecting at 45 degrees), you'll have to slightly modify your elevator linkages and surface.... but so far, I've had no problems with the stock setup and performing 3D.
RC_Junky,
Check out the top page of http://www.the******************.com/ - they have Jeff's email. [Note: I don't want to publically publish his email here, just in case.] They elevate the nose another two inches from the stock gear making take-offs and landing so much easier... if they weren't easy enough with these profiles.. jeesh.
You'll love them.
-Juhan
11-17-2002, 01:48 PM
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CG for Top Cap
Crazy Leggs!!!!!
By far the best value for your dallar !
There tuff and tall!
I love them on my Top Cap!
They makes the TC look bigger and so cool!!
Did I mension they were tuff?
I bought 3 pair and got talk out of the extra 2 pr.
At 12.95 you cann't go wrong.
Their phone no. is 281-488-3993
Don
By far the best value for your dallar !
There tuff and tall!
I love them on my Top Cap!
They makes the TC look bigger and so cool!!
Did I mension they were tuff?
I bought 3 pair and got talk out of the extra 2 pr.
At 12.95 you cann't go wrong.
Their phone no. is 281-488-3993
Don
