Hello Im brad Banks , and Im in South Africa

 Im looking for an alternative for my  IA14R Ivchenko engine, we have 2
 PZL101 Gawron (GAVRON)  aircraft,  they are notoriously heavy on fuel and
 expensive to overhaul.

 The current engine is a 9L monster of soviet excess, it eats 1Lt per min and
 produces 230Hp at 2800 rpm, at cruise the engine ticks along at 70%  +- 1800
 rpm  and it  weighs in at a whopping  290 Kg's with out the prop.

 Could I ask a few questions:

 1)Would a crisp 13B turbo produce enough to spin the V530 prop sufficiently
 to lift off

 2)The reduction in the IA14r is 60% this means to match the prop  rpm to the
 engine will require some paradigm shifting in the design process.(any ideas)

 3)The last hurdle will be that the prop spins clockwise  when looking
 directly at the airplane from the front.

 4) How would one adapt the 13b to enable hydraulic pitch adjustment?( the
 soviets only used 2-5Kg/cm2 as the engine oil pressure.)


 Sincerely brad


 No need for a turbo. A port 13B would be 250 HP. The prop torque would be 570 foot pounds
 with a 2.85:1 gear box from Tracy Crook.

 Clock wise is a problem. The Tracy Crook gear box that spins clockwise looking at the
front is only a 2.17:1 ratio so that would limit prop torque to 434 foot pounds and HP to
about 200...220

 Perhaps you do need a turbo after all.

 Perhaps a 3 rotor would be a better choice.

 Paul Lamar

 Hello paul, our yak 12's are on the way and should land in the first week of July. The
 idea as explained before is to put in a rotary 13b as 20b's are just not available. Will
 it be possible to produce 300hp on the flywheel with around 0.4 boost?
 Next the psru :
 Is it possible to get a psru that will be reliable at 300hp ?
 And still be able to keep the v530 paddle prop?
 V1 the Al14R radial is at 2800 rpm
 And the prop is at 1600rpm.
 V cr is 2100rpm and the prop is at 1260 rpm.

 Regards Bradly Banks.
 South Africa.

 There is no gear box for that prop that I know about.
 What is the diameter?

 Paul Lamar


 Hello Paul in our project to convert our fleet of Russian crop dusters. I have
disassembled a vedenyev M14p engine. It is very slow running but built with classic
Russian overkill.
 By reversing the planetary set I can get a 3:1 reduction whilst still retaining the
hydraulic variable prop arrangement.
 My concern is the sun gear. All the gears in the set are straight cut and with an in put
of 6000-6800 rpm will the mesh cope?
 The complete reduction unit is readily available from various sources .
 Regards
 Bradly Banks


 WOW!!!!That gear box looks great for a rotary.
 My guess is an 80 inch diameter prop with 7500 RPM
 take off. I think the sun gear will be OK. Especially if you scale
 up our new silicone rubber coupling design.

 If you run a turbo and pump it up to 300 HP  at 6000 RPM even a larger
 prop can be used. Make sure you install a turbo tachometer
 and keep the sustained turbine RPM under 80,000.
 Especially at high altitude where the back pressure is lower
 and the turbo speeds up. You can exceed that for a few minutes
 on take off.

 The combination of high EGT (1800 F) and high RPM will
 destroy a turbo.

 The engine itself will long out live the turbo
 especially with ceramic apex seals. My conservative guess is 1000 hours TBO
 in heavy duty duster use. You will be the leading heavy duty rotary TBO
 tester in the world.

 Change all the tension bolts to 1/2 inch from 10 MM.
 Mazdatrix can do that or a rotary drag racer in South Africa.
 Makes a cannon proof engine.

 What does something like that gear box  cost.

 BTW do you know Alex Molteno? He flies for the UN.

 Get one of my cooling books. Send me $50 US.

 To:Paul Lamar
 830 East Santa Maria St.
 Suite 303
 Santa Paula Ca.
 93060 USA

 Mock up the cooling system with Styrofoam after you get
 the book and send me pictures of that. Oil cooling is critical.

 When you get one of these flying let me know and I will come
 down and go for a ride.

 Bradly Banks

Bradley,

I've been looking at purchasing an mp14 gearbox for a PSRU. I was thinking of modifying
the gear set inside for a better ratio for the rotary. I never realized you could use the
existing gear set for a 3 to 1 ratio

My trip to mistral was an utter failure as they will not sell just the PSRU. I'm still
looking for a reduction box with hydraulic constant spend capability. Because I want a
reversible prop for my seaplane project.

Can you explain how you get a 3 to 1 ratio by "reversing the planetary gears"

Also it looks like there is  room for Paul's damper to address the torsional vibration
problem when putting the two together.

It looks like mistrals PSRU (the outside anyways)

Will Failing


To get a 3.12 to one ratio hold the rear Ford C4 ring gear (or any other ring gear) stationary and take the power out of the planet carrier.

Hard to beat the mass Produced Ford parts on cost.

I was thinking recently of copying the Ross design as there are now about
a 1000 out there in every day service if you include Tracy's version.
That is lots of hours and experience.

Not rocket science. The incentive is I recently found a low cost machine
shop in Ventura with big enough machines to make any of it.

Did you get any pictures  of the Mistral office?

Paul Lamar