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Aug 30, 2012, 08:33 PM
I Used To Have More Free Time!
Discussion

Top Flite P47 Razorback Electric Conversion


Hey Folks,
I ran into someone selling their house and in his garage was a TF P47 that he had built from a kit 6 years earlier, but had never maidened it. Long story short, I got a super deal on it and took it home. The monokote job was not done well, so I spent 4 hours taking it all off. Also, I cut all of the control surfaces off, as one aileron was warped, and the elevator and ailerons do not match up well to the wing tips. (see pics).
I took out the Super Tiger G90 engine, took out the Robart pnuematic retracts, and will spend some time this weekend filling, sanding and gluing. It has some build issues that I will redo the right way.
My plan is to install electric retracts (I need suggestions here), electric motor, probably 8 cell, (4cell x2), and I will be fiberglassing the entire plane. (never worked with glass before), and I may install a sound system depending on wieght. This will be my first war bird and my first balsa plane except for my Spectra glider.
All suggestions and comments are welcome.
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Aug 30, 2012, 08:46 PM
I Used To Have More Free Time!
Here is the SuperTigre G90 engine, muffler and mount. The SuperTigre G90, the updated version of the S90K. The main
differences between the two engines are that the G90 is a one-piece crankcase
(S90K was a two-piece), and the G90's muffler is a bolt-through-the-crankcase
(S90K muffler bolted onto the crankcase).
It is now for sale. Make me an offer.
Aug 30, 2012, 09:27 PM
Crash test dummy....
mattthomas78's Avatar
I'm subbed!!
Aug 30, 2012, 10:57 PM
Registered User
gchrisgo34's Avatar
go to hobbyking.com, hey have all sorts of electric retracts. they have all metal units, and they have the size you need. they pretty much have anything you need, and at excellent prices. usually less than half the prices you'll pay here in the states.
Sep 08, 2012, 12:09 PM
I Used To Have More Free Time!
Getting some sanding done. I had to pretty much cover the entire fuse with Durhams Water Putty and light wieght spackling. I use a mixture of about 60/40. I will sand all this off and then do a final touch up with just the light wieght spackiling. And then I will try my hand at glassing.
Does anyone know of any electric retracts that would work in here?
Sep 08, 2012, 12:17 PM
I Used To Have More Free Time!
I just noticed that the motor mount holes are off to the one side more than the other side. The top hole is 3/4 inch from the top, the right hole is 3/4 inch from the side, the bottom hole is 1 inch from the bottom and the left hole is 1 1/4 incehes from the side. This sounds odd to me. Anyone with a TF P47 or someone with plans that can verify this setup?
Sep 08, 2012, 12:32 PM
AMA 994002
matiac's Avatar
Maybe that's for the offset? Aren't they all supposed to be offset to the right to counter torque roll?
Sep 08, 2012, 03:29 PM
I Used To Have More Free Time!
Yes, but the offset refers to the angle that the motor is canted to the right. This looks like the motor would be off center. I am going to run downstairs and mate the old 90 engine to it and see if the shaft comes out of the cowling in the center.
Sep 08, 2012, 03:46 PM
Registered User
TripleW's Avatar
Becareful Glassing. It can end up real heavy if you're not careful. You might weigh it first so you can see how much weight you end up adding.
I would probably not glass it myself.

These might work for retracts.
http://hobbyking.com/hobbyking/store..._20_class.html

You will want a 80 or 85 degree retract for 60 to 1.20 size aircraft.
Did you weigh it before you stripped it down?

Walter
Last edited by TripleW; Sep 08, 2012 at 03:54 PM.
Sep 08, 2012, 03:54 PM
Registered User
TripleW's Avatar
Here is my favorite Razorback.
Big Stud
http://www.google.com/imgres?hl=en&s...,r:8,s:0,i:102

http://www.google.com/imgres?hl=en&s...,r:9,s:0,i:105
Sep 08, 2012, 04:25 PM
I Used To Have More Free Time!
TripleW,
Why would I need 80 or 85 degree retracts? I am not experienced with retracts.
Sep 08, 2012, 04:25 PM
AMA 994002
matiac's Avatar
From one of your first pics it looked OK, the pic was straight on...
Actually i take that back, I just looked at the pic again, and it IS high and to the right.
Sep 08, 2012, 04:51 PM
I Used To Have More Free Time!
TripleW,
The nitro version is said to wiegh in at 9.5 - 10.5 lbs with a wing loading of 30 - 33 oz/sq.ft.
I got rid of the pnuematic retracts for electric (don't know if this is a weight savings or not), I am replacing the 90 motor with an 8 cell electric, and replacing the one aileron servo with two.
I suppose I can put it all together when ready and wiegh it then and determine if glassing is OK. How much weight would glassing add?
Sep 08, 2012, 05:35 PM
Registered User
TripleW's Avatar
Quote:
Originally Posted by NCRealEstateGuy
TripleW,
Why would I need 80 or 85 degree retracts? I am not experienced with retracts.
When the gear is extended they will be perpendicular to the runway.
It takes into account the dihedral in the wing.
Sep 08, 2012, 05:45 PM
Registered User
TripleW's Avatar
Well it depends on your technique and materials used. But you can add alot of weight if your not careful.

Recently one of the club members glassed a 120 size Mustang and it was so heavy it didn't fly well. I don't remember how much weight it added.
Last I heard he was stripping it all off.

I have a Hanger 9, 60 size Hellcat that weighs 9.5 lbs without any glass work. Flies great as is.


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