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Old Mar 31, 2010, 05:05 AM
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baronrouge's Avatar
Nérac -FRANCE-
Joined Aug 2009
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Hi,
After seing the drawing of the Doblhoff, it is not really an autogyro because of jet blast on the tips of the blades I think, like french Djinn helicopter.
These jet blast make the rotor turn and create lift without any torque.
But it can easily make a good RC autogyro.
A very nice project.
Jérôme
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Old Mar 31, 2010, 08:36 AM
AND FOR MY NEXT TRICK....!
jodini's Avatar
Omaha Millard, Nebraska, United States
Joined Sep 2004
4,060 Posts
I thought the jets just got the rotors up to speed for quicker takeoffs....yes?
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Old Mar 31, 2010, 11:20 AM
What could possibly go wrong!!
In Bedfordshire, UK.
Joined Oct 2008
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Quote:
Originally Posted by jodini View Post
I thought the jets just got the rotors up to speed for quicker takeoffs....yes?

No they were powered the whole time, one of the problems was the very high fuel consumption but it must have made a great sound.
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Old Mar 31, 2010, 09:53 PM
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DeRidder LA.
Joined Nov 2008
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Quote:
Originally Posted by baronrouge View Post
Hi,
After seing the drawing of the Doblhoff, it is not really an autogyro because of jet blast on the tips of the blades I think, like french Djinn helicopter.
These jet blast make the rotor turn and create lift without any torque.
But it can easily make a good RC autogyro.
A very nice project.
Jérôme
The rotors were powered only for takeoff and landing.
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Old Apr 01, 2010, 01:20 AM
What could possibly go wrong!!
In Bedfordshire, UK.
Joined Oct 2008
640 Posts
Quote:
Originally Posted by Boneswamped View Post
The rotors were powered only for takeoff and landing.
Hi Mike,

Sorry Mike, you are correct, it was only powered for take offs and landings and to quote a book " Towards the end of 1944 WNF 342 V3 was rebuilt and featured a second propeller mounted coaxially to provide thrust for forward flight when clutched to the compressor. This meant that autorotation could be used for forward flight."

Good luck with the build

Chas
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Old Apr 01, 2010, 03:38 PM
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DeRidder LA.
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Hello Chas,
What's the name of the book you found those great pics and info in? You've posted the best pics so far. I can find very little information that's not already in this thread.

I'm finding that welding small tubing is challenging to say the least. I'm also wondering about the rotor head being fixed parallel to the datum line of the aircraft. I suppose if I pre-rotate the head, I'd have no problems with pitch and roll functions being via swashplate. I have absolutly ZERO experience with Swash controlled autogyros. Mickey's designs seem to have a bit of aft tilt in the mast. The 342 head is level, and it did fly. We shall see.

Pre-rotation plans;
The head and mast will be from Heli parts. I'm considering incorporating a few more parts from a heli frame, namely the main drive gear to facilitate the pre-rotation, and some of the bearing supposrt blocks. Per Mickey's advice, the pre-rotation motor will be a large brushed motor(cheaper, takes more abuse for short durations). The main drive gear on lots of helis contains the one-way bearing.

Thanks for all the input guys, I appreciate all of it.
-Mike
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Old Apr 01, 2010, 04:12 PM
What could possibly go wrong!!
In Bedfordshire, UK.
Joined Oct 2008
640 Posts
Mike,

The book is "helicopters of the Third Reich" by Steve coates. An excellent read.

You will have no problem silver soldering brass tube assuming thats what you will use.

Regards Chas
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Old Apr 29, 2010, 02:58 PM
It was a GLITCH! Honestly!
SafeLandings's Avatar
Stourport on Severn ,Worcestershire, United Kingdom
Joined Dec 2007
4,819 Posts
Hows it going Mike? you have been quiet for way to long mate
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Old Apr 30, 2010, 12:32 PM
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DeRidder LA.
Joined Nov 2008
1,961 Posts
I'm still working on all the details for this build, but it's going to be expensive to build with the engine, and store bought machined 3-blade grip. I've put all my other projects on hold until I build the PCA-2. I'll get back to it eventually.

Regards,
-Mike
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