I have a lycoming, but I would prefer to build a rotary firewall forward
system. I think I can work the engine specific items, but in
looking for a psru... HELP. Most of the sites I have come across are
dead. Does anyone build a reliable PSRU?
RODNEY BINGHAM
If we can get 5 orders we will build a batch of the Ross copies. No
surprises. 100's have been sold. 10 pounds lighter than Tracy's. I'll
test fly it it on my RV4. Silicon rubber coupling. $3000 each. Billet
housing. Fit Jeff's adapter plate. Same bolt pattern as Tracy used.
Paul Lamar
I'd be interested in that. Probably next year before I can order though.
Chad Peterson.
Once we have five commitments it will take a while to complete the order.
Paul Lamar
I'll be needing one in 12 - 16 months, Have purchased my kit plane, it
is about to be shipped from US to Aus..
Regards Keith Bennett
Contact Neal he might as well be making more than one. Neil Unger
<
neil.unger@bigpond.com
Paul Lamar
I would be interested. Could I get a look at the general construction
of it?
Diagram? Pics? Good for 300 hp?
Rod Bingham
Are you in Oz Rod? If so Neal, got any 3D's yet?
Here are a bunch pictures of Tracy's stuff.
It depends on how you get the 300 HP and the RPM you get it at.
If turbo that implies more torque than a normally aspirated P-port
rotary putting out 300 HP at 9500 RPM.
It has been used on a 3 rotor turbo that puts out more torque than one
can get with a 2 rotor engine.
Paul Lamar
Paul,
Today I had the drawings done for the "flex coupling" so
once that is finalized the initial prototype can be made for testing. I
am calling it an improved RWS PSRU as it will fit exactly where Tracy's
PSRU exists. Now attempting to ascertain the weight to compare. Will
definitely be lighter but how much will be the surprise. Once the
prototype has lasted the 50 hours I will aim to produce them in batches
of 5 for sale. Now to build an engine mount ready for the test bed based
on an RV9.
Neil.
The 3D drawing program will tell you the weight of the parts.
If it is solid works you can export an IGES file and I can load that
into Rhino and determine the weight of the part.
Paul Lamar
Try this one. It gets my present vote. Too bad it's not a planetary.
They will be at Oshkosh, I think Stuart Davis is giving a forum on the
unit. Larry Pearlman bought the business from Bud. Neat constant speed
product. Believe they have plans for one for a rotary as well with 0 offset.
Auto PSRU's
(936) 827-5126
geareddrives@yahoogroups.com is the group set up for it.
Marc.
Bud and his daughter died in a Chev V8 powered exp crash.
It is another 100 pound V8 box with a centrifugal clutch that weighs 20
or 40 pounds all by it self.
Furthermore the ratios are less than 2:1 so far. We need about 3:1
Paul Lamar
Here are some pictures of the clutch and fly wheel.
A spur gear drive set like this is six times heavier than a planetary
for the same torque capacity.
Paul Lamar
Yes, I agree. But at least it has the CS hydraulic unit, and the free
running prop is a nice feature when the clutch disconnects.
Marc
Constant speed (CS) can pay off in lower fuel burn but in
a rotary experimental it is not needed for take off. The power
to weight ratio of a rotary powered aircraft is exceptional so
initial acceleration is very good.
On the other hand it takes a while to pay for CS with
lower fuel burn. Higher cost has always been a big issue.
Prop weight is also higher as is the weight of the gov.
Now if you are building something like a C182 bush plane and max
takeoff weight is a factor perhaps :)
Paul Lamar
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