I am planning on getting a WM P-51. Trying to decide on the 46 or 60 size. I would be putting a YS 1.10 in either one. I have seen the .46 size fly with a YS 1.10 and noticed that its FAST...Which I like! I would rather get the 60 size, but was just wondering if the 60 would be a lot slower or just a little bit slower than the 46 (both with the YS 110). I think the weight difference between the two planes are a little over 2 lbs. Just wasnt sure if it would make that big of a speed change between the two planes. Thanks!

Nate

this is way beyond me as to why you would want to shoehorn a 110 (particularly a YS) into a 40 size plane. i'd recommend the 60 size just because 110 is way beyond the requirements of the 40 size. a lot of people put normal 91's in the p- 51s and that is already overpowered. plus, with that YS, how many minutes will you be able to fly on the stock tank? 4? go with the 60. if you really want speed, get a high performance 2 stroke, tuned pipe and a speed prop.

Complete agreement with forestroke, go with the 60 size. The 40 size, which I have, is not big enough for all that metal up front. I put a fairly light .61 two stroke in mine. Ended up a bit nose heavy. I can't imagine what a big four stroke would do to the balance and flying weight.

Hi! It's my WM Mustang60 with OS91fs non pump and 15-5 Wood prop.
Flying is great.
Landing with 1/2 flap is slow and stability.
But , Don't too much slow down, The Mustang may be wing tip stall!!

Thanks for the response. I will most likely go with the 60. If I were to get a 46 size, what engine would you recommend for it? Thanks again

Nate

We have 2 of the 40 size at our field. One has a Saito 72 in it and the other has a OS 46AX. The one with the Saito sounds cooler but the 46AX seems to pull the plane around faster although the speed is not slow with the Saito either.[8D]

Good question. I have a WM P51 and started with a MDS 75 cause it was cheap. Went good, but other WM P51's with 46's were faster.

Went to a Irvine .61 , even slower. I think the 46 weigh helps the model alot.

The 46AX with a 10x7 gets my vote.

That OS 46AX is a seriously good engine. Lots of power and light weight. Lighter than the Super Tigre 40 it replaced, but has more power and lower fuel consumption. I get near 10 minutes of 3D flight on it with a 4oz tank.

I have flown the plane with a Saito 65, Saito 91, and OS 61 FX. The Saito 91 was the funnest one, but a hair overpowered. The 65 flew it more scale-like. My current one has the 61 FX on it and it is a rocket.

i would say that a 91 would be a good engine for the 40 size p-51. but i think the optimum fourstroke engine choice would be the YS63S, Saito 82 or the OS70 Ultimate. i've seen the plane with the first and the last and they have been rockets. for two strokes, the 46AX and 50SX is a great engine. TT Pro 46 is also good. but i know less and less about 2 strokes as i pretty much buy 4 strokes now.

using the heavier engines would also require you to really strengthen the standard retracts, which are known to be on the soft side. while it's not that much trouble to bend them back, it does get tedious if you have to do it every time. i'd stay light, my friends plane with the TT Pro 46 rarely needs to be bent back even if his landings aren't as pretty as mine (both on paves runways). plus, keeping it light and not overpowered will help the overall durability of the model.

I considered a 4 stroke, but finally ended up with a K&B .61 Twister in mine. Weighs about the same as a .45, but more power.

I have had several of the .40 size WM P-51's and built some for friends of mine. I installed 61fx's in a coupl eof them and a G90 in another. My current one is the Miss America scheme. I have a Saito 100 on this one with a 12/12apc prop. Runs real nice. I added some weight on the inside back area of the airscoop.

Just bef up the firewall inside and out and run some extrat epoxy in the retract mountin blocks. I do this regardless of engine size. Should be fine and flys very well.