PJ_TankPilot

Pictured is a typical H9 ARF stab beef up. I remove the bottom covering, fill in the holes with wood and a C.F. tube. This will survive most abuse.

For the WM .46 Mustang, I put a C.F. strip on the front of the trailing edge.

I use CA hinges for the rudder only. All other hinges are Robart hinge points.

MicroDat

Nice work, so you just covered the spaces with a thin layer of ply wood and a CF rod?

PJ_TankPilot

Correct.

The two bays closest to the center are 1/8 lite ply, the remaining 1/8 balsa. The CF is a 1/8 tube. Unlike the wing, the pressure on the stab is a down force.

MicroDat

what's that gray stuff around the wood? Is that ultra/mono-cote?

PJ_TankPilot

Yes, it is the film covering I leave on the perimeter to attach the replacement covering. This is a H9 Spitfire so that is Ultracote.

MicroDat

Here is a vid of YS 110 in 46 size mustangs

http://www.youtube.com/watch?v=DzvkDZQB3X8

JET FX

If you want to go fast forget the 'stuff in the largest engine' theory try changing the wing design.... Cubic inches are no substitute for a nice fast symetrical aerodynamic pylon racer wing profile! then again you might as well just build a pylon racer right!!! Hey but dont let common sense get in the way of a good crash via airframe failure happen?

hmmm ever wonder what sort of prop/ground clearence concerns you might have... maybe a 14x20 prop would work

MicroDat

This is a warbird forum , I posted in here to see if anyone else got a 60 size warbird to go really fast. If I was interested in a pylon racer I would have posted in another forum. In fact why stop at pylon and not go for jets? To me its not just about the speed but the plane. I love warbirds and I like speed so I want a fast warbird.

My ground clearance is fine, I own the Miss America Mustang (the first plane in the vid) and as you can see if you watch the vid its fine. And by your proposal of a 14x20 prop you obviously have no idea what you're talking about.

bla bla

Microdude... it isn't just about strapping the biggest engine into the smallest airframe.
This theory doesn't work... if it did F1 racing cars would have enormous engines on them... as it happen they use completely the opposite.
By using very large engine you're creating more problems than it worth... and to make matters worse... you could well be going faster with a far smaller engine!
You need R's... massive amounts. Two stroke pylon racing engines doing 25,000RPM spinning heavy pitch props.... now you're moving.
Keeping thing light is the key. As is having a design that is suited to speed. That isn't a P51. Even your average, normally powered hobby p51 is going far faster (we're talking scale speed here) than a full sized version goes.
Over powered planes just perform plain ugly... they handle bad, perform bad and look bad...as in not good.
You need so much right thrust, extra aileron trim... so much extra ground clearence... possibly even a larger fin.
P facture, torque problems, gyroscopic effect... it all makes for a grim flying experience.
Mind you, juging by the video it doesn't look like the finer point are really your concern.
If going like stink is your thing... get a dedicated modern pylon racer and paint it to look like a P51.
The thing about a specialise pylon racer is they're build and constructed for serious structual stresses, handle beautifully and they go SOOOO fast... you'll DO yourself, so take an extra pair of underpants.

MicroDat

Have you heard of NHRA? But comparing cars with planes is like comparing apples and oranges.

Putting the YS 110 in a 46 size mustang doesn't really create problems that are not solvable, and to me its very much worth it. Also, if you can find a faster engine for the 46 size warbirds that is smaller than the YS 110 I would love to know.

People who first put the YS 110 on a 46 size plane were aware of this, that is why they use a 12x10 prop (under proped) to get around 12,500 RPM on the YS 110.

Of course keeping it light will make it faster and we know the P51D isn't the fastest airfoil, but if we wanted a fast airfoil we would have all bought pylon racers (Or even a spitfire or zero which are slightly faster when scaled down). I think you're missing my point that I want a fast warbird (Not a pylon racer, not a jet), and in particular a P51 because that is usually everyone's favorite warbird (I know it is my favorite warbird).

I think the plane looks fine, in fact I like the look. The head of the motor sticking out of the bottom doesn't bother me. I know warbirds don't handle as good as sport planes (Edge, Extra, etc) but that's not why I buy them. Even then I think they perform fine; the plane I fly has built in thrust compensation so torque rolling has never been an issue. Also, all of the "problems" you mentioned isn't really a problem at all or it has been fixed.

I think you have really missed the point of this thread. I wanted to know if anyone has built up a plane like the one I am proposing not if I should. That isn't to say I don't take constructive criticism, but it seems to me you're really talking out of your a55.

bla bla

[quote]ORIGINAL: MicroDat



Hey, remember your the one putting the DZ on the little plane.
We're here to help you.

PJ_TankPilot

Forget about the speed of the AMA and FAI pylon racers. Sure they are faster and more reliable than an overweight warbird running a 4 stroke on high nitro.

Let’s talk about which aircraft are most cool. If you don’t believe me, ask the impartial observers, the spectators.

2 stroke engines running 25K RPM are annoying at best, painful at worst. And it can get boring when all the aircraft sound and look the same. Our spectators love to see 4 warbirds going around the pylons at 150+ MPH sounding and looking more like real airplanes.

My club has AMA, FAI and Warbird pylon racing, all world class. At the warbird races, the spectators stay longer, spending more money. The extra revenue is sweet and the racing is tons of fun.

MicroDat

Totally agree, plus I will never put a 2 stroke on any of my warbirds. They just sound like chainsaws with wings.

ljones4617

In one of your pics you show that your wing broke apart and you say you didn't beef it up. What kind of beef up should you have done? I'm in the process of building my .46 with the YS-110 setup. And I want to make sure I beef up all the stress areas the right way. More pics would really help. Thanks in advance.