Hi Paul,
As far as I know, Rotamax rotary engines do not have any oil sump,
they work with oil direct injection. In your opinion, is that a good
thing or not? Would you recommend oil sump or oil direct injection?
I am looking to get 350 Hp out of a 2 Rotor engine, in all aluminum.
please see following picture of a Rotamax engine.
http://www.indysportaviation.com/Oshkosh2008/rotamax120hp.html
Thank you Andy Mangold
It is called charge cooling and it is inadequate for an aircraft
engine called on the generate over 50% power for long periods of
time.
You will need a high pressure oil system with oil cooled rotors. In
other words a Mazda.
Paul Lamar
Paul, Thank you very much for the info. I am planing to run the two
engines only on 50%, even for take off. Only in case of emergency,
when one engine is failing, the remaining engine has to go up to 100,
but only for about 5 minutes. In a case like that, would you say it
is OK?
Andy Mangold
Good luck. Might work.
The rubber coupling they used also failed causing a crash.
Paul Lamar
The charge cooled rotary engine and the 2 stroke piston ignition
engine seem to suffer the same defects : - low fuel efficiency, -
large amount of oil in exhaust gas, - not suitable for high charge
base load operation. - not suitable for turbocharging (and
turbocompounding, of course)
and also share some good points : - simpler and lighter than their
counterparts, - automatically lubricated in any position.
So they are suitable for the same applications that require low power
for limited time and high peak power to weight ratio as RC models,
chainsaws,...
Philippe Dejean (France)
Guys. thanks for all the info.
Does anyone know the weight difference between an all aluminum two
rotor engine and a engine with iron cast side housings?
Also does anyone know if I can mount the two rotor engine just on the
Bell Housing?
Andy Mangold
The bare cast iron Mazda weighs 190 pounds. The bare all aluminium
Mazda weighs about 110 pounds.
It is possible to mount it with the bell housing but probably would
require some tig welding on the bell housing. Send me a sketch of
what you have in mind.
Do you have a gear box?
Paul Lamar
Again thanks for the info.
About the mount, you can see two PDF drawings in the attachment.
I do not have a Gear Box. I could mount the engine right at the
front of the Block. The engine will be hooked up direct to the drive
shaft with a flex coupling between. Then the driveshaft goes on to a
center gear with a reduction for the propeller. The same on the
opposite side. The drawings are with the Rotamax engines and those
have mounting points on the belly and on the top.
That is the reason why I am asking, if I can mount them just on the
front/ to the Block on the Shaft side. That strange form around the
engine is made out of carbon fibers and serves as Engine mount and
also for the landing gear, which you can not see on these drawings.
Andy
That will work but you only need two rubber bushings on that end of
the engine. One on the other end. That is all you need to locate an
object in space. The two rubbure bushing react the torque from the
engine.
Read this.
Hi Paul, As far as I know, Rotamax rotary engines do not have any oil
sump, they work with oil direct injection. In your opinion, is that a
good thing or not? Would you recommend oil sump or oil direct
injection? I am looking to get 350 Hp out of a 2 Rotor engine, in
all aluminum. please see following picture of a Rotamax engine.
http://www.indysportaviation.com/Oshkosh2008/rotamax120hp.html Thank
you Andy Mangold It is called charge cooling and it is inadequate
for an aircraft engine called on the generate over 50% power for
long periods of time. You will need a high pressure oil system with
oil cooled rotors. In other words a Mazda. Paul Lamar Paul, Thank
you very much for the info. I am planing to run the two engines only
on 50%, even for take off. Only in case of emergency, when one engine
is failing, the remaining engine has to go up to 100, but only for
about 5 minutes. In a case like that, would you say it is OK? Andy
Mangold Good luck. Might work. The rubber coupling they used also
failed causing a crash. Paul Lamar The charge cooled rotary engine
and the 2 stroke piston ignition engine seem to suffer the same
defects : - low fuel efficiency, - large amount of oil in exhaust
gas, - not suitable for high charge base load operation. - not
suitable for turbocharging (and turbocompounding, of course) and also
share some good points : - simpler and lighter than their
counterparts, - automatically lubricated in any position. So they are
suitable for the same applications that require low power for limited
time and high peak power to weight ratio as RC models, chainsaws,...
Philippe Dejean (France) Guys. thanks for all the info. Does anyone
know the weight difference between an all aluminum two rotor engine
and a engine with iron cast side housings? Also does anyone know if I
can mount the two rotor engine just on the Bell Housing? Andy Mangold
The bare cast iron Mazda weighs 190 pounds. The bare all aluminium
Mazda weighs about 110 pounds. It is possible to mount it with the
bell housing but probably would require some tig welding on the bell
housing. Send me a sketch of what you have in mind. Do you have a
gear box? Paul Lamar
Again thanks for the info.
About the mount, you can see two PDF drawings in the attachment.
I do not have a Gear Box. I could mount the engine right at the
front of the Block. The engine will be hooked up direct to the drive
shaft with a flex coupling between. Then the driveshaft goes on to a
center gear with a reduction for the propeller. The same on the
opposite side. The drawings are with the Rotamax engines and those
have mounting points on the belly and on the top.
That is the reason why I am asking, if I can mount them just on the
front/ to the Block on the Shaft side. That strange form around the
engine is made out of carbon fibers and serves as Engine mount and
also for the landing gear, which you can not see on these drawings.
Andy Mangold
You only need 2 rubber bushings on one end of the engine. You need
at least one on the other end. Otherwise there will be a lot of
bending on the plate.
I am curious. Where did you find 2 rotamax engines?
Is it a one rotor or two rotor?
Paul Lamar
Your info helps me a lot, highly appreciated, thanks.
they are two rotor engines and I dont have them yet. I was in contact with
Eric Barger and he gave me an estimate how much they will cost. But that is
already a couple years ago. Two days ago I contacted him again, but did not
get any answer so far, I am still waiting.
Your question sounds a kind negative, does Eric Barger build no engines
anymore?
Andy
I don't know. I have not heard from Eric in years.
Take a look at the 50 HP cart engine called the AIXRO.
Paul Lamar
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