Hi Guys,


I just wanted to get some opinions about using an OS Max 1.20AX engine in the ESM - P-51B Mustang -"Bald Eagle"?

I am also thinking of the DLE 30 Gas engine as an alternate engine. I have anew OS Max 1.20AX engine with about 8-10 runs on it. I would like to use this engine and not have to lay out another $300.00 if possible, it seems like such a nice engine & very powerful. I had it in a "U-CAN DO 3D -60" & it had unlimited vertical performance. However I don’t want the engine to be marginal.


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ESM - P-51B Mustang -"Bald Eagle"

Manufacture Specs:
Wing Span: Approx. 71”
Fuse Length: 62.3”
Wing Area: 6.11sq. ft
Wing Loading: 33 oz/sq. ft
Weight Approx.: 13.5lbs.
Engine: 1.08 2 cycle -1.20-1.50 4-cycle or 26CC gas
Prop Recommendation: (For OS 1.20) 16x8 or 15x10

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Would this OS Max 1.20AX engine with a - "J'TEC"-Radiowave In-Cowlmuffler, set up inverted, be a good choice? I don't want it to be marginal in where I need to run the engine at 75% to 100% full power just to keep the plane flying.

As per the specs, it says that the total airplane weight should come in at around 13.5 lbs. This is debatable...... I weighed out all the pieces of mine and mine came out to 15.4lbs. From what I have read in other threads this is in the same ball park as other ESM -P-51B planes.

Also if I go with the OS Max 1.20AX, I also need a recommendation for Prop sizes for this particular Warbird / Engine 1.20 OS Max setup. (If I choose to go this way)?

I have checked with OS, and OS Max recommends 16X8, 15X10. But I was looking for someone who may have a similar set up and which Prop Size, Brand & Type that worked well for them.


So what would you recommend? Go with the OS Max 1.20AX engine with a - "J'TEC"-Radiowave In-Cowl muffler? Or buy a new DLE30 size Gas engine; however keep in mind I do not want to sacrifice the plane but if the OS Max will fly it well, then Great…..


Thanks Guys
Ed

Ed I think the 1.20 would fly it fine. It is not going to have unlimited vertical but Mustangs are pretty sleek and you should get good speed out of it. I had a kit built P-51 back in the day from GP that was ST .90 powered. It was plenty fast.The DLE30 or DLE 35RE would be more powerful, but the physical size of the 30cc gas is night and day different compared to a 1.20. The DLE 20 uses the same bolt pattern as your OS but would not have the power. Look at a 30 or 35 before you buy one. They are huge side by side to a 1.20.

David

Hi Daveopam,

I don't know how familiar you are with this particular plane. I don't know if you realize that this plane comes in around 18 pounds give or take a half pound. I have been told the flight performance would very marginal at best with the 1.20. The other issue is it takes about an extra pound to a pound in a half with the 1.20 to balance it. The DLE 35 gives the added weight plus more thrust to power the plane.

Wow! No I did not know it was that heavy. I was looking at the specs listed above. It showed 13.5 pounds. If the 18 pounds is closer to reality than the 35 RA would be my pic. I have 84" span Extra with a DA60. It weighs 17.5 pounds. I can't imagine flying it with a 1.20.

David

Do yourself a favor and look at the same plane on YouTube and read the descriptions and see what engines were used and how well they performed. From that point you can make an informed decision.