Topflite Giant P-47 Club
06-24-2016, 03:20 AM
#801
Join Date: May 2014
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Mine is kit built with all the scale goodies at 35lbs. It would not not balance at 5 1/4 at rib 5 so I moved it back to 5 1/2 and it balanced almost perfect. It was done inverted with the gear up. I had my maiden and it flew just fine. I may still add 4oz of lead in the front of cowl as it felt just a touch aft of neutral. Im suprised there is so much debate an a plane that has been in production forever.
Last edited by Bhodi11; 06-24-2016 at 03:35 AM.
06-24-2016, 03:35 AM
#802
Join Date: Jan 2015
Location: Metamora, Michigan U.S.A.
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
35 pounds eh, I'm at 31 before the balance. I thought I was heavy but you say yours flies well. What engine and prop do you use. This question arose because the arc is much different than the kit. t 5 1/4 it just looks too fR forward.
06-24-2016, 03:37 AM
#803
Join Date: May 2014
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Min is electric. I have the Eflite Power 360 with 4 5900mah 6s packs setup for 11800mah 12s. Prop is a Xoar 24x14. It swings about a 1000rpm faster than the same on a G62. I also remember when I was considering going with a gas setup using a G62 would have been about 4lbs lighter than the electric.
Last edited by Bhodi11; 06-24-2016 at 03:43 AM.
06-24-2016, 04:04 AM
#804
Join Date: May 2014
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
06-24-2016, 05:39 AM
#805
Now see this posses a hell of an issue for me, a month ago I attempted. To balance mine as recommended and I guesses it needed 5 pounds up front to balance. So I made weights that would be bolted on with engine mounting bolts and were made to be like cheek plates along both sides of engine so it was as far forward as possible. If I move balance point back to where yours is at I don't need but maybe a pound. How did you balance hours. My problem is I don't have any help and doing the Vanessa rig which I've never done before so I don't really trust it.
06-24-2016, 06:34 AM
#808
Join Date: Jan 2015
Location: Metamora, Michigan U.S.A.
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
If you used 6 1/2 back at fuselage sides this is different location fore aft than what kit instructions recommend. Did Tony turn you on to this number? I'm just curious as to how you came up with this number versus what the kit says and then being comfortable to fly it the first time. If I use this number I balance fine, going by the kit numbers I need huge nose weight.
06-24-2016, 10:40 AM
#810
Join Date: May 2014
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
06-24-2016, 10:52 AM
#811
Join Date: Jan 2015
Location: Metamora, Michigan U.S.A.
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
This all kinda scared me. The same plane should balance in basically the same spot no matter it's final weight. I still don't understand the tech guys answer about the arf being different internally so it balances in a different location. My friends arc looks identical to mine. I need to measure his tail feathers, only think I can think of is they are a different size.
06-24-2016, 01:50 PM
#813
Can anyone please tell me where the 5th rib is from the center joint of the wing on the Top Flight P-47. Also are the Ribs in the same position from the center Joint of the ARF / ARC / Kit wings. Thanks
OH almost forgot what is the name of the rope contraption used to balance planes & is there a video on U-Tube that demonstrates it's use?
OH almost forgot what is the name of the rope contraption used to balance planes & is there a video on U-Tube that demonstrates it's use?
06-24-2016, 01:59 PM
#815
Just Google this ( rc plane cg calculator ) There are a million ways to determine the CG of any wing/airplane
Aircraft Center of Gravity Calculator
Just to add some complexity to the mix
http://adamone.rchomepage.com/cg_calc.htm
The CG Calculator.
http://www.friendlyflyers.org/cg-calc.html
http://www.scaleaero.com/CG_Calculator.ht
Aircraft Center of Gravity Calculator
Just to add some complexity to the mix
http://adamone.rchomepage.com/cg_calc.htm
The CG Calculator.
http://www.friendlyflyers.org/cg-calc.html
http://www.scaleaero.com/CG_Calculator.ht
Last edited by HoundDog; 06-24-2016 at 02:15 PM.
06-24-2016, 03:35 PM
#816
Join Date: Jan 2015
Location: Metamora, Michigan U.S.A.
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
Ok, Google don rice Vanessa rig. He hangs a 47 and does a nice job explaining himself. Go buy clothesline thick cotton clothesline and some foam insulation funding and 2 bucks for 3/4 dia. Dowel and some flat wood. 1/2 x 3 x 12 inches is all you need
06-24-2016, 05:31 PM
#818
Join Date: Jan 2015
Location: Metamora, Michigan U.S.A.
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
rib 5 at 15 inches from center exactly. On the arc the wings sheeted and plans book won't say. Wing is also 85 inches but wing is 1329 sq. Inches and plan 1/2 inch shorter
06-25-2016, 04:59 AM
#820
Join Date: Jan 2007
Location: palma de mallorcaSPAIN, SPAIN
Posts: 413
Likes: 0
Received 0 Likes
on
0 Posts
Thanks to everybody whit the cg question.Today i went to my local airfield to make some test before maiden.
taxi was vey succesfully .drive the plane pn the ground is very easy.I set too the engine.I change the first propeller 24x12 by 24x8.whit this i have 6200 RPM on the ground and a static thrust of an awesome 11.5 kg of traction.More than enought to put the plane in the air safely.
taxi was vey succesfully .drive the plane pn the ground is very easy.I set too the engine.I change the first propeller 24x12 by 24x8.whit this i have 6200 RPM on the ground and a static thrust of an awesome 11.5 kg of traction.More than enought to put the plane in the air safely.
06-25-2016, 05:20 AM
#823
Join Date: Jan 2007
Location: palma de mallorcaSPAIN, SPAIN
Posts: 413
Likes: 0
Received 0 Likes
on
0 Posts
Changes
Hi haefely i live in a island in the mediterranean sea( spain)the plane has not flown yet. I need first to add the dummy engine in the cowl and then set the.CG for the maiden
My local airfield.
www.satanca.net
150 meters of paved runway wiht asfalt and today 37 heat degrees
My local airfield.
www.satanca.net
150 meters of paved runway wiht asfalt and today 37 heat degrees
Last edited by kurrikan; 06-25-2016 at 05:25 AM. Reason: Adding some changes