Two pro aside the engine...

[bowns]

Two pro aside the engine,power transfered however possible,just to eliminate
the devil torque tipping machine over and lower the cg.
Is it a doable or just a stupid one? :D

[Brian Jackson]

Bowns,
Are you asking about using 2 side-by-side props to cancel torque? If so, there are at least 2 exampes of this being done. I don't remember the thread, so perhaps someone else here can chime in.

Welcome to the forum!

Brian Jackson

[bowns]

tHAT‘S IT，ROTOPIX。ANY IMPRESSION HOW THEY PERFORMED？

[PW_Plack]

Bowns,

Welcome!

The added complexity is not necessary to solve this problem. The use of a tail with full-span rudder and horizontal stabilizer, both centered behind the propeller center, makes torque effects almost disappear.

[quadrirotor]

that's it!...From a polish site of gyro.

[PTKay]

This ia a Polish gyro Ważka.

Site in German

http://www.piotrp.de/AMATORSKIE/dwiatwa.htm

or in Polish

http://www.piotrp.de/AMATORSKIE/pwiatwa.htm

[PTKay]

But the idea is not that stupid, take a modern motocycle engine
with 100-120 hp in the same config like Ważka (22 hp) and
it might fly quite well.

[Helidev II]

Thats what Im planing on using, except either a 12a or 13b rotary.
However I think that Ill just use a chain drive to each prop, svae the extra weight of the drive shaft and turning gearbox.
Im planning on having adjustable pitch props for yaw control in the hover/jump take off.
Atleast thats what Im planning.

[bowns]

My initial concept of two props aside was based on a converted engine with two extended output shafts,rpm reduced(or not reduced) and axis direction 90 degree turned.I was told it's possible.If so,the engine may work far more merrily because the crank now laboring in balance.

[Alan Coats]

It ought to work well - most everything else the Wright brothers did on their Wright flier has proven out over time .

Alan

[quadrirotor]

suzuki engine two props!

[Helidev II]

Andre, Ive been looking for info on that plane every where, have you got a site for it?

[bowns]

Can some body open this and get us a larger pic. of it?Cute one.i used to have the picture but that's before my old pc collapse.

http://www.rayne.freeserve.co.uk/

[PTKay]

Andre, Ive been looking for info on that plane every where, have you got a site for it?

Here is Paul, not Andre, but here you go:

http://www.fk-lightplanes.com/FK-History/fk-history.html

The palne is FK 11, build just prototype, the following FK 14 Polaris,
more traditional construction is very sucessful, BTW build in the
FK subsidary factory in Krosno, Poland.

Have a look also on the "grown up" version of this solution.
(FK 11 seems to have been a "technology demonstrator")

http://www.hp-aircraft.de/edoc/unter.html

Also only a prototype, but my favorite - a serious DIESEL aircraft.

[PTKay]

The concept revived !

And with a diesel too.... ;)

http://www.hp-aircraft.de/doc/home.html

PTKay

[Cobra]

Neat concept...
Is this the answer to solving the disrupted airflow issue behind the enclosed cabin pusher design? Im thinking the ideal arangement might be a twin tail and/or twin rudder arrangement behind twin props/ducted fans. It might also be feasable to mount two smaller props on short wings. I like this idea.