Twin engine contra rotating prop

[440_Magnum]

Re: Twin engine contra rotating prop

With a short stroke engine it should be possible to have a shaft through the front crank. I am not sure whether this has ever been done.
Sorry did not get a chance to look at the Youtube video if this is relevant. Its blocked here.

Well, the stroke would have to be shorter than the diameter of the bearings, and the "through" shaft would have to be smaller than the difference between the stroke and the bearing diameter..... I think breaking and re-welding the rods on every turn of the crank would be more practical, frankly!

[AirDOGGe]

Re: Twin engine contra rotating prop

With a short stroke engine it should be possible to have a shaft through the front crank.

I'd love to see a diagram of how THAT"S suppose to work...

..Maybe if each crank journal was a tiny gearbox, translating the rotational energy around each crank...






NAHHHHHHHHHHH!

[Skyracer]

Re: Twin engine contra rotating prop

With a short stroke engine it should be possible to have a shaft through the front crank.

Let's see now; really short stroke, bore limited by piston weight, lots of cylinders = adequate horsepower, lots of RPM's, not much torque. Hey, it's a Formula 1 car.

[bluffman]

Re: Twin engine contra rotating prop

I had a video of the Macci-Castoli that clearly showed the front engine starting, and then the rear, the smoke from the exhausts when the engines started separately was distinct, and the props rotated separately as well.

[Jason S.]

Re: Twin engine contra rotating prop

I had a video of the Macci-Castoli that clearly showed the front engine starting, and then the rear, the smoke from the exhausts when the engines started separately was distinct, and the props rotated separately as well.

Here you go. http://www.youtube.com/watch?v=gLRLhZJsCh4

[David E. Wells]

Re: Twin engine contra rotating prop

Here's another one for you...ever heard of a Latecoere 299A? 2 Hisso's in a line, contra props, 1943-44...D.

[W J Pearce]

Re: Twin engine contra rotating prop

Here's another one for you...ever heard of a Latecoere 299A? 2 Hisso's in a line, contra props, 1943-44...D.

I must admit that is a new one for me. But very similar to another French design, the Arsenal VB 10. Drawing board in 1940, war-delayed 1st flight in 1945.

http://www.aviastar.org/air/france/arsenal_vb-10.php

I'll have to hunt down down info on the 229 and 229A. Thanks for the tip.

[AirDOGGe]

Re: Twin engine contra rotating prop

Here's another one for you...ever heard of a Latecoere 299A? 2 Hisso's in a line, contra props, 1943-44...D.

That's a new one to me too. Much thx on the information.

Great photos of it here with shots of the internal engine/drivetrain layout, including showing how the 2 engines are positioned in the airframe, how they get power to the props and the routing of the counter-rotating driveshafts passing through the "V" of the forward engine...

LINK:

http://www.luftwaffe-experten.org/forums/index.php?showtopic=814

TYPE:
Latecoere 299 two/three seat carrier borne torpedo bomber prototype.
Max Speed: 221 mph at 4,920 ft.
Climb Rate: 13,125 ft in 10 minutes 43 seconds.
Service Ceiling: 19,685 ft.
Range: 932 miles.
Armament: two fixed and one trainable 0.295 in 7.5 mm machine guns and one 1,653 lb torpedo or up to 1,321 lb of bombs.







.

[Leo]

Re: Twin engine contra rotating prop

My first thought was "it's French so of course it's ugly" then I noticed a striking resemblance to the Fisher P-75...

[Skyracer]

Re: Twin engine contra rotating prop

Was surfing about on this subject earlier today. The VB-10 was a "clone" development of the Late 229A. Also, the Late 229 was a single engine version that developed into the 229A.

[bluffman]

Re: Twin engine contra rotating prop

If you watched the video posted by Jason S, of the MC, it is obvious where I got the idea for the windshield on Blind Mans Bluff, I thought it was way cool, so I copied it as best as I could.

Larry

[W J Pearce]

Re: Twin engine contra rotating prop

Thought of another one today. Same idea as the MC 72. This is a Russian one, the Bolkhovitinov S-2 (sometimes referred to as S or S-2M-103). Link is in Russian but has some good pics.

http://www.airwar.ru/enc/bww2/sparka.html

Larry, funny how you linked BMB's windshield to the MC 72. Mentally I knew of the similarity but I did not know it was intentional.

[Peashooter]

Re: Twin engine contra rotating prop

My first thought was "it's French so of course it's ugly" then I noticed a striking resemblance to the Fisher P-75...

Leo, I was thinking the same thing.

http://www.aerofiles.com/fisher-p75.jpg