I had just bought one of the Model Tech P-47 Razorback .60-.90 size ... I was just wondering if anyone has any feedback on this model .... I am considering running a rossi .60 to start because it what I have right now but will upgrade to a .90 later ...........

I haven't flown mine yet, but I can give you some hints on the building of it. Do whatever you can to keep the tail light, as you are going to have to add significant weight to the nose to get the CG right. Move the battery and all components as far forward as possible. I would consider going with a big four cycle for weight reasons, and a 1.20 wouldn't be a bad idea. This plane is really a .90 size in my opinion. I started out with a Saito .80 on mine, but went to a 1.00 before I even started it.

Putting an OS FS 91 in mine....almost done. Have read alot of posts of different flyers having to put 10 to 12 ozs of lead up front....hence the 1.20 (gotta add weight...add power instead)!

Incidentally, I'm putting a heavy weight spinner on mine. The spinner that I'm using coincidentally looks a lot like a scale P-47 spinner.

ultrastealth, what spinner would that be?

I don't have it yet, but I will post the exact name and brand when it comes in.

Here is mine that has been worked over a bit. The dual exhaust is in the scale location and the louvers are functional. Sounds good. Magnum .91 for power. Didn't have to add much weight to balance, after the 7oz. copper tubing exhaust work.

Hey two stroker,

I like the barby in the background ...makes it look scale :rainfro:

Nice job what radial did you use FTE T.F??

Top Flite 1/8 scale. Thanks.
Tim

Hey what size prop are you guys running on this thing anyway..... I was thinking of putting a Maloney 125 gasser on it but I found out that the maloney was a little large for the air frame so I'm gonna go with a .90 4 stroke instead..

how'd you setup the louvers? mine comes in this week and i'm trying to figure it all out. and second question did you use the copper tubing AS a muffler and director? or just to direct the stock muffler to the ports? as we spoke before, i'm trying to figure that out still.

thanks.

Here you go.

More

Another

Last one.

so you didn't need to use a muffler?
How's the back pressure with out it.. Do you notice a difference in the way the engine runs?

I love the way you did that. amaziing work.

If the lack of a "real" muffler isn't an issue I say to hell with the $95 pitts!!


I assume the connection to the motor is just salavaged from the original muffler, right?

thanks for all the pics and ideas

The engine runs very strong and has a really neat sound. If you look at the picture you will notice the pressure fitting is located in the larger tubing (1/2") and supplies good pressure for the tank. The larger tubing also gives lets the engine really grunt on the bottom end, it has great throttle response. The first exhaust design was made from smaller tubing and did not let the engine breath and the tank pressure was too much, so I know it was restricting the engine. This set-up works good, I wouldn't say I have increased engine performance, nor hindered it, it just sounds cool.
And yes, the stock header was used along with an 85 degree header extension.

I see... so it's 1/2" tubiing from the engine to the first exhaust port. Is that a smaller sized tube off the T to the second port - 3/8" or so? My knowledge of ducting makes me think my eyes are right in thinking it's a bit smaller but i'll ask just the same.

I'm probably gonna go with the Saito 1.20 in the end since I'm set on using a 4 blade prop. unless the 13x6 i have made up does wonders on my .91 test bed.

Not to be a continuing pain, but it looks like you cut 2 channels to lay the piping, am i correct on that? and second, how did you temp proof the wood in that area to the port as it looks like you have the actual copper coming out of the port at the end. do you have any heat issues?

Though I figure in time it'll give a real streaked effect from the oil and such... I can't wait.

The heat from the system is an issue that does require a bit of aluminum heat shielding. Also the exhaust is shielded from the fiberglass cowl. As for the tubing size, it is jumped up to 1/2" after the factory header then downsized at the first exhaust "T", 1/4" if I recall. The troughs for the exhaust dumps are also lines with aluminum flashing, and the exhaust tips are shrouded in aluminum as well. The entire thing is made of copper even the tips which are 90's.
As with all glow engines it makes an oily streak'ed mess on both sides instead of one. The best part is watching it spew dueling smoke trails.

Did you over spray the monocoate, and if you did what prep do you do.

Just lightly sanded the coating to remove the shine and sprayed with fuel proof paint.

Nice job TwoStroker!! I just placed my order for one after looking at your exhaust pics I will trying to do mine like you did.

here is mine.. I used spring airs and robarts struts.. I orignally flew it with an OS 90 2 stroke it flew real fast I then changed it out to an OS .91 4 stroke sounds much better !

Hi All,

Here is a photo of my Model Tech P-47 that has been modified a little. I stripped the tail surfaces and applied the red/white stripes, painted the red stripes on the cowl to make it look like a squadron that flew out of Italy during WWII. It is powered with a Saito 91, has a Slimline inverted pitts muffler, a McDaniel onboard glow driver and I drew up the nose art and other markings in Corel Draw, then had a local company print & cut them out. I also installed a Robart retractable tailwheel.

The Jug flies great and the sound coming from the Slimline pitts is awsome!