Experiment with twin motors on a Tiny trainer.

[Ratcheeroo]

That is one beautiful plane, maybe I need to rethink my options again regards building a twin

There are a lot of options out there, this is my DH-88, I believe 13th Squadron released plans for this as well running off of 1806 motors I believe.

 

[TheFlyingBrit]

Thanks @Pieliker96 that makes sense

 

[TheFlyingBrit]

There are a lot of options out there, this is my DH-88, I believe 13th Squadron released plans for this as well running off of 1806 motors I believe.
View attachment 211176

That looks good, nicely finished too. I am surprised it only runs off MT1806 motors though, she looks a bigger plane than she actually is then ?

 

[Monte.C]

Its weird that you guys are discussing twin prop projects because that is next on my list. Have already built the FT MS P-38 and Vincent Unrau's DH-88 but I found something that really caught my eye the other day and immediately printed the plans just to have on hand when I was ready to start, I have a couple of Emax Rspec 2205 motors that will be perfect for this plane.
View attachment 211175

Oh that's gorgeous.

 

[Monte.C]

Having the props rotate inwards at the top is generally better for engine-out scenarios as the p-factor and gyroscopic precession from the remaining engine will act opposite the moment of the asymmetric thrust, and the prop torque will tend to hold the wing with the dead engine up. The one wild card is how the slipstream interacts with whatever's behind it, depending on configuration this effect may overpower the others and make a outwards-at-top rotation direction best.

"tend to hold the wing with the dead engine up." Oh that's a good one. Hadn't thought of that. Thanks.

 

[Ratcheeroo]

That looks good, nicely finished too. I am surprised it only runs off MT1806 motors though, she looks a bigger plane than she actually is then ?

13th squadrons version is 1806 motors, mine are 2212 1000kv and it is big, 55' wingspan

 

[L Edge]

If you want to see what the problem was with the plane why they reversed the direction pay attention to the development section:

https://en.wikipedia.org/wiki/North_American_F-82_Twin_Mustang#Design_and_development

Where it really needs to by thought out is when the props are at the end of the wing. Directed towards VTOL's design when your flow is perpendicular and parallel to wing.

 

[L Edge]

If you want to see what the problem was with the plane why they reversed the direction pay attention to the development section:

https://en.wikipedia.org/wiki/North_American_F-82_Twin_Mustang#Design_and_development

Where it really needs to by thought out is when the props are at the end of the wing. Directed towards VTOL's design when your flow is perpendicular and parallel to wing.

Here's one for you, if you have a dual EDF's, it is best to use Clockwise and CounterClockwise fans? Turning RPM's in or out towards center?
That has to be looked at for 6th generation jets that don't have rudders.

 

[Matthewdupreez]

Its weird that you guys are discussing twin prop projects because that is next on my list. Have already built the FT MS P-38 and Vincent Unrau's DH-88 but I found something that really caught my eye the other day and immediately printed the plans just to have on hand when I was ready to start, I have a couple of Emax Rspec 2205 motors that will be perfect for this plane.
View attachment 211175

Wow!!! What plane is that??? It sure is incredibly beautiful!!!!

 

[Ratcheeroo]

Wow!!! What plane is that??? It sure is incredibly beautiful!!!!

It's called the Sportwin.

 

[Matthewdupreez]

It's called the Sportwin.

She's gorgeous ☺️