Ed,

All true, but PP comes into it's own = when you=20 need that extra power to match the size of the aircraft.

I'm pursuing the single for those = aircraft that=20 need just a bit more than 100 hp.

I think Richard is doing a great job = in this=20 area, and I hope he is successful.

George ( down = under)

Hi Dave,

I was just responding to Doug on whether I = thought the=20 H2000 aluminum brazing rod (pretty amazing stuff) would work to braze = the PP=20 tube to the outer aluminum surface of a rotor housing. I think = it would-=20 provide you are able heat up the housing = sufficiently.

While I find PP very intriguing, I = realize that=20 since I don't fly to the power capability of my stock 13B, there would = not be=20 much point on investing the time and money for a PP. Yes, it = could be=20 nice on take off, but then I throttle back to my normal 7.5-8 gph = economy=20 cruise. So it just doesn't seem to make it worth the effort - = for me and=20 my way of flying.

However, for those who want high speed cruise = it sounds=20 like a good way to go. The problem is other than Richard = Sohn and=20 his PP single rotor, I don't know of anyone who has actually done it, = much=20 less flying with one. The exception is the $$ PowerSport engine = - nice=20 PP, nice power - but expensive.

----- Original Message -----

From:=20 david=20 mccandless

To: Rotary motors in = aircraft=20

Sent: Friday, June 29, 2007 = 10:24=20 PM

Subject: [FlyRotary] Re: PP=20 Construction..

On 30, Jun , at 9:08 AM, Ed Anderson = wrote:

Doug, I have not tried that particular brazing job, but = I=20 think it would be much better than just about any other method so = far=20 mentioned. However, that rotor housing is a = large mass=20 of aluminum to get up to temperature brazing temperature, so it = would=20 probably take a high BTU torch and perhaps a larger propane tank = (like for=20 the BBQ grill) rather than the smaller bottles. I = would=20 certainly try it on a junk housing first. But, seeing what = they did=20 in the H2000 video with that stuff, I would say it's certainly = worth a=20 = try.

&nb= sp;
Ed

Hi=20 Ed and Doug,
I have been following the posts on al brazing, but I = am not=20 sure I have this right.
Are you suggesting that a SS Pport tube = could be=20 TIG welded to the steel liner inside the rotor housing and brazed to = the=20 cast aluminum housing on the outside?
This sounds like the = ultimate=20 solution
BR, Dave = McC