Mu-2
 

70"span

Looks close to the K model. Used to fly the K and J a long time ago. For the model, the landing gear are probably positioned correct for rc rotation and ground handling. But the full scale is further back. This made rotation and landings a hand full. The yoke had to be buried into your chest as soon as the mains touched, or the nose would drop down too fast and could cause damage. Are you going to install retracts? On the stab, do you have the inverted airfoil? Full fowler flaps? Spoilers? The full scale didn't have ailerons, just spoilers. Nice project to tackle.

Yes, the gear was moved a bit forward for easy rotation. Plain horizontal stab airfoil, no flaps or retracts. Just wanted to see how a basic light mu-2 would fly. Also added 6" of span to get the wing loading down. It flies very well. The plan is to fit retracts and spoilers to this. Full span flaps would need a new wing where I would use the spoilers if they work out, and I would go to a scale wingspan.
Paul

it was supposed to be a J model, but with 3 blades!

Very cool project! If you build the next one more scale, make sure that you have a 3 axis gyro. With flaps down on a normal landing approach, I seem to remember that I didn’t land with more than 20 degrees of flaps. At slow speed, the spoilers were not very effective. Flaps didn’t move or act as ailerons. On final with a little bit of wind, you would have to move the yoke 90 degrees from center in both directions just to keep it stable. At high speeds, the spoilers were very effective. Flew them in the early 80’s. Was the fastest turboprop at that time, maybe still is, but I don’t know. A lot of guys killed in them, due to poor training. It didn’t need a Type Rating.
For reliability, I am assuming that you are using electric engines?

Did you used to own, pilot or work on them? Not too many people know about the Mu-2.

I have been told about the spoiler effectiveness at low speed so I'll have to experiment to get a good setup. My receiver has a built in stabilizer that I thought would be needed but the model is stable enough that I haven't turned it on. That might change with flaps and spoilers.
It is electric, e-flite 25's. It should develop into a decent scale model.

I was flying corporate years ago and we demoed one. Other than that its just an airplane that I haven't seen modeled.
Paul

Predictions of MU-2 shaped foam and fiberglass scattered around the field proved to be exaggerated!

Paul

That is too cool! Love the gear doors and the wing droop. I hear you on the pessimist at the field. I’m glad that your forum caught my eye. Looking forward to the next one with retracts, etc. I love scale and having something that no one else has on the field is the best feeling. This does it! On center line too..doesn’t get any better.

You noticed the droop!!!! It took a lot of effort to put in in there, but it wouldn't look right without it.
Paul

Yeah, the droop.
I remember it from my early days working in full scale aviation.
If you didn't properly balance the way you added fuel, you could end up with a tip tank on the ground and the opposite main gear up in the air a bit.
I swear, as you performed the fueling process, the wing tips would drop what seemed to be a full 36"
And the sound of those 331's......yikes!
I always liked the PT-6 powered aircraft for the way they didn't howl on the ground as compared to the Garretts.

I learned to fuel them as line boy, and then when I had enough ratings, I was hired in by the company that was flying them. I always waited on the Chief Pilot at that time hand and foot. It paid off for me, verse the Flight Instructors at the field, including my own that were still teaching a year or more later. They did nothing but bad mouth the company. While flying the Mu-2, I did have a couple line boys that I asked prior to going into the FBO if they knew how to fuel them. They didn't, and I would catch them prior to the tip tank being full and on the ground. Always had to watch like a hawk. It was a hassle with a single point hose and having to go back and forth between the two tanks. You could fill them half full, then go to the other side to top it off. Plus they were pressurized, so if I or the line boy didn't relieve the pressure, he usually got a face full of jet fuel spray. The PT6 guys(King Air guys) couldn't fly them and didn't want to fly them. Most were afraid of the plane. I had a heck of a lot of respect for it. It could kill you quicker then *****. I later flew the King Airs and Cheyennes with the PT-6's. I was glad that I had the Mu-2 experience prior, since the PT-6 planes were extremely easy to fly.

But!! To build a successfully flying Mu-2 model is an accomplishment! Never thought I would see a flying model of it.