I am researching, looking for a suitable Rotary engine for an aircraft.
 I would like to subscribe to your newsletter and also ask if you know
 of a mfg. that makes a rotary engine that weighs 80-100 lbs and delivers
 150+ hp to a propeller turning 2500 rpm.

 Thanks
 Lyn Amestoy

 You have set HP per pound requirement unrealistically high.
 Is that the bare engine weight with out gear box or the firewall forward
 weight?
 Wankel rotary engines usually run about .7 HP per pound firewall forward.

 With a 3:1 gear box, all aluminum construction and and about 8000 RPM
 takeoff you
 might achieve as much as 1.2 HP per pound.

 Small aircraft piston engines like the O-200 are .5 HP per pound,
 The O-320 is about the same ratio.

 Paul Lamar

 With a 3:1 gear box, all aluminum construction and and about 8000 RPM
 takeoff you
 might achieve as much as 1.2 HP per pound.

 Small aircraft piston engines like the O-200 are .5 HP per pound,
 The O-320 is about the same ratio.

 Paul Lamar


 Paul,


 Paul,
 Rebuilding my single rotor. All aluminum components. High compression
 rotor.
 P port. Just waiting for the race balance at Mazdatrix, then final
 assembly
 here in Utah. 3.17 Ross drive. How much Hp might be possible at 8000 rpm,
 takeoff limitation?

 Lewis.

 Good work Lewis!! My guess is close to 150 HP.

 You lucky dog to have a 3:17 Ross. I would love to have one for the RV4.

 Makes sure it has the sun gear thrust bearing mod. Also look into
 swapping
 out the 4 pinion planet carrier for a 6 pinion version and use Tracy's
 torque
 idolater instead of the spring clutch center. Or find a Porsche unit with
 rubber
 bushings. I am not sure that will fit the Ross input shaft spline so
 check
 that first.

 Paul Lamar

 Who does the mod?

 Lewis.

 Try jeff doddridge <4starr@cox.net
 If he does not want to to it ship it to me and I will tell
 my next door neighbor machinist Jim Poole how to do it.

 Paul Lamar

 Thanks very much. I'll get started.

 Lewis.

 I forgot to mention the reason for doing this. The helical gear thrust
 is transfered to the Mazda thrust bearing which is not up to it.
 Tracy destroyed a thrust bearing early on.

 Paul Lamar


 Jeff is willing. He will get in touch with you.
 In addition to the sru, what other components will he need?

 Lewis.

 Paul
 Last time I talked to Slauson they recommended the 4 pinion due to
 manufacturing issues on the 6 pinion. Would a single rotor require
 the heavier 6 pinion?
 If anyone has a Ross to donate for the shipping I would see what
 modifications are needed for the various ratios. (I have a 1:87 G.A.P.
 used for comparison on what NOT to do) :)

 Dan F

 Slauson does not carry the 6 pinion. You might get it here.
 http://www.makcotransmissionparts.com/AOD.html
 http://www.makcotransmissionparts.com/E4OD-4R100.html


 Paul Lamar


 Paul
 Slauson does have the 6 pinions is about $80.00 without ring gear and
 sun gear and they have the ring gears and sun gear also in stock you do
 have the choice of news or used parts,i already purchase 2 units from
them

 Jean Prudhomme

 When did that happen? I called them a month ago and they told me they
 could not get them.

 Paul Lamar
 --


About 4 mos ago

Jean Prudhomme

The word I got was only about a month ago.

Paul Lamar