What size of motor for a 60lbs plane?

[Worldraft]

With all the smart people out there I’d like to get a discussion going here:

• What size of gas motor would you recommend for regular flying airplane that has a 112” wing span and the will weight about 60 lbs?
• The engine recommended will have how much thrust?
• And here is the dousers for the recommended engine how much torque does it deliver?

Jean

[dmichael]

Phew- 60lbs on 112".... That's hefty. What kind of plane are we talking about here and what kind of flying do you want to do?

[TheTank]

yeah, 60 pounds at 112", definetly brick-like unless its a bipe of some sort. Bob Trueworthy's Pitts flies great with a 3W 212 and it comes in at 64 pounds... it has two wings though, that are both bigger than 112".

[MrKiwi]

Thunder Tiger 40. Should haul but with the size of a plane.

[Worldraft]

The air plane in question is a 1/4 scale P40E and the weight is an estimate and with everything on board

Jean

[SleepyC]

Thats gonna land FAST..... and if it snaps... Oh man......

[Dennis C]

	Quote: Originally Posted by SleepyC
	Thats gonna land FAST..... and if it snaps... Oh man......

Fast isn't the word..more like supersonic

[Hitec625]

Thats not even a landing, more of a RE-ENTRY. but the 212 sounds like it might work. but beyond that, worry about getting the weight down man.

[plane]

Calling Bill Hempel, calling Bill Hempel...darn no answer.

1. If the plane weighs 60lbs and you don't know what motor you're going to put in have you actually calculated the motor weight going into the plane?
2. A P40 has a very narrow cowl so more than likely a large inline twin would be the way to go to keep things clean.
3. I know of no 200cc+ inline motor made.

In my opinion you're going to be very disappointed with the project unless you can shave 10lbs or more off of it.

[SleepyC]

This may do the trick for a skinny cowl.
A 150cc inline V twin.
By Evo...

The 80cc pulls like a 100cc motor, perhaps the 150 twin will rock as well!

[dmichael]

I figured that you'd really want something like 200cc + and it would need to be narrow- boxers are out unless you don't mind the cylinders sticking out the side. As far as I am aware the only engines that would even get closeto meeting these requirements are the 3W 150 inline twin and the Evo that Sleepy suggests.

I wonder if I should ask this but it's just killing me not to- were you already considering the Evo? I would have expected that this would be a candidate in your mind already- given that your website indicates that you are making the muffler mounts for Roger and he has a note on his web page about a forthcoming P-40. Are there more details that you haven't shared with us yet? Is this the P-40 he refers to? Would love to see that one!



Dave
Team ZDZ
RCShowcase.com

[dmichael]

Followup- I see from some of your other posts that you have asked about using an electric. A consideration could be that motor that Bernd Benschorner is using on his 40pct Raven. It has been reported that he has restricted the power by 20% and still has awesome power. Perhaps this setup without restricting the power would work for you.

Dave
Team ZDZ
RCShowcase.com

[SleepyC]

I think the 3W inline would be sweet as well!
I mean in our 3D land of super powered planes.. we somtimes forget what a plane actually needs to fly... Even at 60lbs I bet the #w or Evo 150 would fly that sucker!

I'm suprised that some of the 25lb and 30 lb warbird are flying on G62's...

haha... power, once you have had a taste of 2:1 power... its hard to go back...

[Worldraft]

	Quote: Originally Posted by dmichael
	I figured that you'd really want something like 200cc + and it would need to be narrow- boxers are out unless you don't mind the cylinders sticking out the side. As far as I am aware the only engines that would even get closeto meeting these requirements are the 3W 150 inline twin and the Evo that Sleepy suggests. I wonder if I should ask this but it's just killing me not to- were you already considering the Evo? I would have expected that this would be a candidate in your mind already- given that your website indicates that you are making the muffler mounts for Roger and he has a note on his web page about a forthcoming P-40. Are there more details that you haven't shared with us yet? Is this the P-40 he refers to? Would love to see that one! Dave Team ZDZ RCShowcase.com

At this point Evo was considered, and basically that’s were I got the motor weight. However I did ask 3 question and so far what I see is that it wont fly but no one has brought positive remedy such as try to lower the weight or install a bigger motor or or or.
The two other question was what is the thrust that a 200 + CC would give but there are no response to this as of yet. The forthcoming P40 on Roger’s page is the one that he wants to build, but he will be using the plans that I’m making. So far as equipment we are not necessary going to be the same. He will obviously be using an EVO motor, and I think he said that it will be the 150 inline or V I don’t know. The reason that I am posting this is because there is a lot of knowledge out there and I would like to gather as much of it as I can so that the plane will fly as real as possible. That’s another reason that my original post said that I don’t want a fast plane or aerobic model.
Hope that answers some of the questions.
Jean

[paffy]

Umm.. guys - this is a WARBIRD, I don't think he needs 3:1 thrust to weight ratio .....

And if you are designing from a scratch, pay VERY close attention to airfoil selection and flaps. What will be the total wing area ?

P.