Coming down from a 400ft dive. The right side of my elevator came lose! I think I got close to 100mph. No big deal to fix, but it could have been worse if came off during flight. I always thought that side seemed a little fragile. This happened after 35 flights.

Sounds like maybe you were flying the airplane past its performance envelope??

It sure did look cool!

Past it's performance envelope? Are you serious?

The real mustang could go over 430, surely this arf should be able to handle at least 350......

Actually, sounds like a loose hinge.

UMMM, have you figured out the scale speed?

I think Crashem has a very good point....

I'll be looking for your results in the crash forum, at a later date.

I don't hope to, but it sounds like it may happen soon enough.

The metal hinge connecting the two fins was where it had come loose.

Scale speed? Nah, didn't bother since it was HUMOR. But based on strength to weight ratio, the model should certainly handle a much higher G loading!

Anyway, looks like a poorly hinged surface WAS the problem! (No applause, just send MONEY!)

I think it may have just been in the way you glued it all up. I don't buy the "past the performance level" stuff. My WM P-51 below has a ST G90 and i am gettting and average of 100mph out of it routinely.
I also have your Hangar 9 P-51 in the box out in the garage for this winter project. Plan on a Saito 150 up front. With modifications of common sense, it should handle it.

i have seen a post or two here where the h9 p5i has had flutter or loose hinges- which i think may be hard to tell apart. i just put my h9 p51 together and to eliminate the chance of flutter i added a 1/16 sheet of balsa to the top of the horizontal stab. of course i also enlarged the slot in the fuselage to fit.

then i re-covered it in my preferred warbird colors which include ultracote fluorescent red for visibility in the air. i have flown it and it flies very well- although i am working to see if i can get the speed from this plane that i want. i tried a saito 100 on it and this thing is definitely slower than my top flite p51 with a super tiger 90 2 stroke. i have been using a 14-8 prop on the saito and will be trying a 13-10 next... if the weather holds

ed

For Whatever it's worth:

Crashed mine today when the left stab broke of in flight. Did a 50 degree bank turn with 3/4 throttle (Have a OS 91FX). Broke right where the stab meets the fuselage. I have owned the 40 size P-51 from WM and never had any high speed or high load problems. I will call Horizon tomorrow and see what they say.

Interesting....keep us posted on what Horizon says.

Cyclic Hardover, that is some flying field you have. No flying round high risers or approaching over the parkway then into a quick slip to get down.

It kind of evolved over the last 50 years or so. Right now it is a top of the line 700ft x 150ft asphalt AMA sketched out park. Rules & regs apply, you fly like an idiot, your gone! Like you said, no trees or buildings in the way. Funny though without and hazards like that,people still find ways to entertain us if you know what I mean.

A friend of mine and I each bought the H-9 P-51 today. Really interested in hearing what others are using for power, what yours weighed, and any problems that you may have had. I am trying to decide whether to nstall : an OS 61, YS 91 FS or my trusty OS 1.08 FSR.

Any thoughts?

Thanks,
Ed

I also own this plane but its out in a box awaitng assembly. This is my third active P-51. I also have 2 OS 1.08s which are the most reliable engines i have but to install it in the plane means hacking up the sides of the cowl.
*So I am going with a inverted 4 stroke. I have seen a couple here with Saito 100's. Not bad at all but I am mounting a Saito 150 in mine. Along with some modifications in the strees areas, should deliver what I want.

Awesome response with the OS 61.FX!! I also bought a sport muffler to help with scale.

Well, I have got my H9 P-51 together and all of the "stuff" has been installed. After much thought and discussion amongst my flying buddies as to which engine to install (OS 61 SF, OS 1.08 or my YS 91), I decided to put my YS 91 in the plane. I was pleasantly surprised that the valve cover doesn't protrude quite as far as I thought it might. The big problem is the ugly muffler. I think I am going to order one of the exhaust swivels and mufflers from Dave Schadel at Performance Specialties. Anyway, the model came out at 8 lbs on the dot. I have the 1000 mah battery pack located directly in front of the throttle servo and the receiver is mouted directly behind it. The model took no weight (nose or tail) to balance. I have a 3.5 " CB Associates spinner (soon to be replaced by a Tru Turn as soon as it comes into my LHS). I did add a pilot to the cockpit but no othere changes to the recommended way Hangar 9 suggests. The retracts took a little work to get the servo mounting tray installed and the retracts working correctly. Nothing wrong with the retracts installed in the model, it is just that the rectangular cutout in the wing center section for the servo is tight and my big clumsy hands don't do well in confined spaces. I opened up the rectangle to get a little better access to the area. I did construct the servo mounting tray outside of the wing and then was able to install the completed tray thru the enalrged servo opening. I did have to add a piece of 1/8" X 1/4" stock to the bottom of the servo mounting tray to get the bottom of the low profile retract servo to clear the bottom of the wing center sectio ply rib. Not a big deal and it worked out well. The instruction manual says to use a low profile retract servo but if you have a standard height servo you might try ot use it. Eventhough the vertical fit would be tight, a standard height servo might work. When you trim the wire pushrods to the rectract, use some really good wire cutters. This is some of the hardest wire I have cut in a long time. I didn't really use the instructions, because the model goes together well and if you have done ARF's before, there is not a lot to figure out. Hope to have maiden flight this weekend.

Later,
Ed

You will love it with the YS 91. I've found that the 15 x 6 APC is the "hottest" setup.

Becareful not to gun the throttle too much on takeoff. I did and the torque of the engine put it into a cartwheel after a 2 foot rollout. Takeoff slowly at 1/2 throttle.




SINYFLY

Well, I flew mine yesterday. Flies great at 8 lbs with the OS 91. I have the CG right on the money per the instructions. I may play with it a little since it has some slight trim changes with different throttle settings. May also look at about one thin washer of down thrust. After three flights I think that I will replace the mechanical retracts with some pneumatics and Robart struts that I have sitting around. The stock steel LG struts are way too soft and allow the model to sway right to left too much for my liking. One thing that I did notice on my plane that is rather interesting is that the model seems to move the tail a few degrees to the left and right in straight and level flight. I came to call this trait "hunting". Interesting because my H9 Edge 540 did the same thing. I got rid of most of the problem with the Edge by moving the CG around. I am inclined to believe that the root of the problem may be the CG location, so I am going to play with it and see what happens. I'll keep you posted.


Later, Ed