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Let me just throw in here where I stand on the PP
vs SP. The only reason I have PP on the single rotor is that it is the only way
I could build a really light engine. I can not make a compound side housing
using side ports, within the weight envelope I have now. More power than a
side port motor? Good if "yes", still a very light and simple engine if "no".
PP on a full size two rotor? Only if a
considerable weight reduction goes with it. I don't think one can get
near the relaiability of the stock configuration with a non industrialized
PP design. How much more power at what cost(effort)? Don't forget, the rotary
power to weight is already over Lycos, and that with not operating
it at the limit of its ultimate capabilities.
FWIW
Richard Sohn
N2071U
----- Original Message -----
Sent: Saturday, June 30, 2007 6:05
PM
Subject: [FlyRotary] Re: Brazing was
[FlyRotary] Re: PP Construction..
I agree, George, When you've gotta have the power, then
you've gotta have the power.
I am certainly not Poo-Pooing PP at all. I
have just (belatedly) come to realize (in the wisdom of my old age), that just
because something is available that can do x,y, and
z, I really don't need it if all I plan to do is
x {:>).
I am certainly eager to see some of you guys work this
out - who knows I may not be able to resist {:>)
Ed
----- Original Message -----
Sent: Saturday, June 30, 2007 5:39
PM
Subject: [FlyRotary] Re: Brazing was
[FlyRotary] Re: PP Construction..
Ed,
All true, but PP comes into it's own when you
need that extra power to match the size of the aircraft.
I'm pursuing the single for those aircraft
that need just a bit more than 100 hp.
I think Richard is doing a great job in this
area, and I hope he is successful.
George ( down under)
Hi Dave,
I was just responding to Doug on whether I thought
the H2000 aluminum brazing rod (pretty amazing stuff) would work to braze
the PP tube to the outer aluminum surface of a rotor housing. I
think it would- provide you are able heat up the housing
sufficiently.
While I find PP very intriguing, I realize
that since I don't fly to the power capability of my stock 13B, there
would not be much point on investing the time and money for a PP.
Yes, it could be nice on take off, but then I throttle back to my normal
7.5-8 gph economy cruise. So it just doesn't seem to make it worth
the effort - for me and my way of flying.
However, for those who want high speed cruise it
sounds like a good way to go. The problem is other than
Richard Sohn and his PP single rotor, I don't know of anyone who has
actually done it, much less flying with one. The exception is the $$
PowerSport engine - nice PP, nice power - but expensive.
Ed
----- Original Message -----
Sent: Friday, June 29, 2007 10:24
PM
Subject: [FlyRotary] Re: PP
Construction..
On 30, Jun , at 9:08 AM, Ed Anderson wrote:
Doug, I have not tried that particular brazing job, but I
think it would be much better than just about any other method so far
mentioned. However, that rotor housing is a large
mass of aluminum to get up to temperature brazing temperature, so it
would probably take a high BTU torch and perhaps a larger propane tank
(like for the BBQ grill) rather than the smaller bottles.
I would certainly try it on a junk housing first. But, seeing
what they did in the H2000 video with that stuff, I would say it's
certainly worth a
try.
Ed
Hi
Ed and Doug,
I have been following the posts on al brazing, but I am
not sure I have this right.
Are you suggesting that a SS Pport tube
could be TIG welded to the steel liner inside the rotor housing and
brazed to the cast aluminum housing on the outside?
This sounds like
the ultimate solution
BR, Dave
McC
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