I'm currently building a Model Tech P47. I have my choice between two engines, a Magnum .91RFS or a 120RFS. Looking for some advice. Not looking for blazing speed from this beast, just don't want to add nose weight as I understand it builds very tail heavy. Any other mods or experiences with this plane would be appreciated. Thanks.

The Magnum .91 4-stroke will work just fine. If it builds tail heavy, then you would want to add nose weight.

As I recall from earlier threads (I have one in building stages, currently on hold) most people who used the Magnum .91 had plenty of power but needed as much as 10 oz. of nose weight to get the CG correct.

You might consider using the Magnum 120 for that reason. You will have plenty of power and won't have to add "dead weight" that does not produce power for you.

I have the arf version and I have an OS 90 in it and it is flying just fine. Here after I get my building table cleared off some I plan on pulling the covering off and recover with ultera coat chrome to copie my Giant Scale P-47. That way I will have two of them a big one and a little one. I also plan on sheeting the wing sos I can put bomb drops on it the mechanical retracts are working just fine except for a rough landing once and a while (have to straighten the gear wires out) also plan on trying to build gear doors for it also. If you guys noticed that the area under the fuel tank is hollow. On mine I took and cut out about 1/2" under where the tank would be to about 1/4' from the outer sheeting of the belly and them used some skinning ply to enclose this area sos the hot air from the engine could be vented out of the cowel down the belly pan to the turbo exhaust. This works quite well for my bird and greatly inproves the looks of here too. So now all I have sticking out the cowel is the muffler. If I had a scanner I would post some pictures of what I did and I think you guys would realy like it. My batteries are located above the fuel tank.

I am running mine with an OS 1.08 inverted. Works well and flys good.

Either of you motors will be fine, mine had an RCV90SP and flew quite fast with this set up, with no noseweight, suspect you might need a bit of noseweight with the 90 sized motor. I think either motor will fit in the cowl though. Here's a pic of mine, standard film covering with the black stripes removed and invasion stripes added in film. Great flyer, shame it wasn't a bit more accurate in shape though.

Ian.

I forgot about that, even with a 1.08 up front, it was still a tad tail heavy.

Here are some pics of mine with the Saito 150 in the nose. It balanced perfectly and flew great. I did it to use the large Graupner 15x8 three blade prop.

Paul
www.rcwarbirds.com

Are you using an onboard glow driver for that inverted 2-stroke? Any problems kepping it running?

Mine is under construction right now. Here's a pic showing the G-26 converted to electronic ignition bolted to the firewall...

I also have a set of Robart #551RS pneumatic retracts and 7/16" RoboStruts on order, and I will be using 3" Robart Diamond Tread wheels. Construction is pretty much stalled at this point until my retracts come in.

How did you P47 pilots get the fuel tank secured in there. I'm running out of ideas for mine? Thanks.

I have bigggg pieces of foam rubber in and around it. Its in their real good.

idigbo, that is a nice finish you have got there, looks much nicer than the stock finish.

You want a 2-stroke for this plane, it flies slow with a 4 stroke.

a ST G-90 or Magnum 91 XLS will do just fine.

Stock everything works great, assuming you're a half-way decent flyer.

Hey guys,
I just flew mine for the first time this past Sunday. The plane flew great, I have a Saito 1.00 w/ an APC 14x8 prop. It is plenty fast with that engine. I like to fly fast and I flew it around at 1/2 to 3/4 throttle most of the flight.

The plane also balanced without any additional weight. The battery is crammed in above the tank all the way to the front.

This is obviously a newer version of this plane. I read about the crappy covering and the wing fillets and decided to get it anyway. When I got mine, I was pleased to find that it was covered in Monokote and the wing fillets were already installed.

Overall it is a pretty nice plane and I am pleased with it. I would rather it have been covered in Ultracote, and go together as quickly and easily as a Hangar 9. But, I have managed to get over those few shortcomings.

Alan

Bama, how did you install your fuel tank? Thanks for the report.

Cruz,
I remember something being a little different about the tank mounting but I can't remeber what, I'd have to look to be sure. I guess what was different about it was that it was going to be hard to secure. I too packed some big pieces of foam around it and wrapped the battery up in a bunch and shoved it up in there. I packed enough foam and stuff around it so that it can't move.
Hope this helps,
Alan

To secure the tank you could glue a couple 1/4" sq. balsa sticks inside the nose from one side of the fuselage to the other, then velcro or rubber band the tank to the sticks.

Now that's an idea. Is that what you did?

I realy did love this plane before I got into 3D lately.

I will sell mine (stock) cheep to someone local. N. Fla or S. Ala.

Here is a thread I started on this plane last year.

http://www.rcuniverse.com/forum/fb.asp?m=1751154&key=

hope that link works, good luck

You know, I haven't got there yet! But I have been thinking about it Before I commit to a tank location I wanted to have my retracts on hand (Robart pneumatics) so I can make sure there is room for the air tank and valves, etc. Unfortunately, they are on order and have yet to arrive. In fact, I don't even know when they will get here.

I have hinged the ailerons, installed the aileron servos and control horns, joined the wing halves and drilled and mounted the wing (even though I wanted to do all of this after I installed the retracts - its easier to work on a short wing half instead of one looong wing, but I'm impatient and wanted to get started). I have also mounted the engine and installed the throttle servo and pushrod, and installed the servos for the elevators and rudder (even though I have not glued the tail feathers in place.

I started on the tail feathers and have had to do some sanding and "messaging" to get the horizontal stab to sit correctly. One side of the fuse, where it glues, was a lot higher than the other. I bought a Robart Incedense meter yesterday, so before I glue it to the fuselage I'll make sure the stab is parallel with the wing.

That's where it sits now. I figure I'll start taking some pictures to show my progress. So far so good!

Ok, I understand. Please let me ask you how you set up your throttle linkage. Did you use the supplied control wire? I'm installing a Mag 120 RFS and if I use the supplied wire it binds really bad due to the throttle servo location and engine throttle control arm. Then to add insult to injury, the fuel tank is in the way. []I'm considering using a cable wire. Keep me posted on the fuel tank installation once you get it.

cruz,

I used one of Sullivan's nyrod do-hickies for the throttle linkage, the one that has the black nyrod in the white tube. What's nice about it is it can be snaked around obstacles but still move freely. If I'm not mistaken, because I'm using the Zenoah G26 my throttle servo and cable is on the opposite side of where it would be with a 4-stroke glow. It is on the right side of the fuse (as seen from the pilots chair). The cable wire is another option that provides flexibility white maintaining functionality (boy, I sound like my old college professors).

I'll take some pics this weekend and post them on Monday. My wife and I are taking a weekend vacation so I won't get any work done. About the only thing I can do right now is glue on the stabs. Anyway, keep posting about your progress and I'll do the same. Take her easy, and if she's easy take her twice...see ya!

Thanks for the help. I'll look into getting me one of those for the throttle linkage.

Yes I am, I also have the engine offset a couple degrees so that there is less of a chance on any fuel puddle.