Paul:  Finally got the small peripheral port/intake runner engine
installed on the dyno.  Here is a brief video of the engine being run
through its paces with the experimental Helmholtz muffler I built.
The  muffler has been the biggest surprise.  Has a nice deep sound
signature and performing beyond expect ions. I have detailed photos
of it during construction. The link for video.

Steve Beckham

https://youtu.be/EfreUJt-Fsk

It is a private video. Why? some people (like me) do not want to
sign in. If you just send it to me I will upload it here. I have
software that can make it smaller if it is too big to publish.

Steve Beckham is one of the famous rotary engines in aircraft
pioneers back in the 90's.  Back when the United States was great.
He partnered with Everett Hatch. They built one of the first all
aluminum Mazda based rotaries. Here are some pictures.

They competed in the Sun & Fun time to climb to 3000 feet from a
dead stop. As I recall they did it in 59 seconds running NOS. Also
Steve's pilot Allan Tole  went 228 MPH in the Sun & Fun 100 and won
the class. Here is a screen capture of the pertinent news paper
pages.

They were the first to use P-ports I think.

Steve, we noticed that the bigger the diameter of the final exhaust
pipe the more pleasant the sound.

Paul Lamar


Please try the link now.  You should be able to distribute.

https://youtu.be/EfreUJt-Fsk

Thank you,

Scott Strayhan

Can anybody capture that?

Paul Lamar

That's got to be the quietest high output rotary anyone has built!
Neat test setup.

Gary Knutson

That is only about 230 HP. Maybe a little less when running a prop at
6000 RPM static. Normally aspirated. Steve's intake runners are a
bit smaller in diameter  as I recall. Lately we have been using 2
inch OD and on a dyno run we were getting 250 HP at 7000. In the air
the RPM will pick up when the prop comes out of stall.

In rotaries the HP curve is not a curve. It is a straight line :-)
With a 2 inch OD p-port and shorter runners you can get 300 HP at
10,000 RPM. The big problem with that is the gear box is only about
3:1 at best. If we could find a 4:1 planetary then we could get more
HP. They make them but they are very expensive and rare. They look
like this.

There are 2 planet gears on each planet shaft. A small one and a
larger one. They are connected together.

The sun gear drives the small one and the ring gear reacts the larger
one. They tend to be weaker than a simple planet. They are used in
Jeep transfer cases.


Paul Lamar


Can you not use two sets of planetary gears in line?

Mark Dillner


Probably but it would double the weight maybe.

Paul Lamar


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