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Jerry,
Keep us all informed about the Rotormax
efficiency, performance, reliability and longevity also PSRU -OK?
George ( down under)
Not me. Since Rotamax has a
130 hp two rotor that weighs in less than 200 lbs including the PSRU, I quit
worrying about how to power my airplane. In fact, I don't see much point
in the single rotor any more. BTW, did I mention that I have
switched from the CH 701 to Buttercup, a great Steve Wittman design. I
got the plans last week, and have got a good start on the full size
lofting. Buttercup lands at 40 mph, cruises at 125 mph with a top
speed 145 mph This is with an 0-200. With the Rotamax she
will leap off the ground- or at least that is my hope. The trees at the
end of my 800 foot strip are getting taller every day. Here is a
Buttercup. I know, beauty is in the eye of the beholder. I
think she is gorgeous. jerry
On May 1, 2008, at 6:10 PM, George Lendich wrote:
Bill,
I agree, and that is what I felt that was
needed, but wanted your opinion on it, as your the engineer. I wasn't
alluding to thicker plates - just means more weight IMHO. Thicker is
stronger for agricultural equipment and the farmer's needs that's for
sure, it even looks good on the land - but not for the aviator who is
balancing strength with weight issues.
I though bringing this up might help Jerry
design out potential problems, if he ventured down this path.
George ( down under)
George, If anything needs beefing up it would be the fore and aft
direction. That could be improved by boxing the sides of the beams
supporting the bearings. That would do more than thicker plates. That could
be done with way less material that way rather than making the plates
thicker Bill Jepson -----Original Message----- From: George
Lendich < lendich@optusnet.com.au> To:
Rotary motors in aircraft < flyrotary@lancaironline.net> Sent:
Thu, 1 May 2008 12:11 am Subject: [FlyRotary] Re: PSRU
Bill,
The front plate does not appear to
be tied to the rear plate ( at the top) other than with the prop shaft
itself - to me it looks like there could be some flexing of this front
cantilevered (from the bottom bellhousing) plate.
Something I think could be better engineered
- do you feel it's stiff enough?
It also looks very agricultural! I'm
sure Jerry could make a much nicer job of it.
George ( down under)
Jerry, the plate behind the bellhousing looks 50% thicker than it
needs to be for a double sided system. I do give him points for
originality though. He needs to use a aluminum top sprocket for sure! Good
support on both sides for sure, looks super stout. My guess is that the
belt is certain to be the weak link in that system. He could do a
serious lightening job on that and still be quite solid. Good re-sourcing
of original materials. Bill Jepson -----Original
Message----- From: Jerry Hey < jerry@jerryhey.com> To: Rotary
motors in aircraft < flyrotary@lancaironline.net> Sent:
Wed, 30 Apr 2008 2:45 pm Subject: [FlyRotary] Re: PSRU
George,
you are very hard to please! I think the guy who made this knew what he
was doing. I'd like to know the weight too. One thing is for sure, a
belt drive has to have two sprockets, upper and lower shafts, prop
flange and so on. They all weigh at least 40 lbs. I think weight could
be saved back by incorporating the alternator in the drive similar to
Briggs and Stratton, likewise the forward engine mounts. Make that extra
structure earn its keep. Jerry On Apr 30, 2008, at
5:21 PM, George Lendich wrote: > >>
Does anyone recognize this drive? I found the photo yesterday
but >> with no information. I think it is a beauty and I
would like to know >> more.
Jerry > > Jerry, > It looks very
much a home made job, the top belt wheel looks to be > made of
something solid and would be heavy I would imagine. I can't > say I
like it or the engine mount - but Paul's the expert there. >
I'm sure you could make something better Jerry. > It looks
like they put the engine really low to cater for the off-> set thrust
line - I wonder if it was made for a pusher? > George ( down
under) > > -- > Homepage: http://www.flyrotary.com/ > Archive and
UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html > -- Homepage: http://www.flyrotary.com/ Archive and
UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
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