flyrotary@lancaironline.net Mailing List Archive

The close-up slide throttle is driven by the exagerated idle problem. I fell for that in my initial work with the single rotor. First I had only one side port. The idea was to add the P-Port and run the engine on both. Because of port timing interferances(in my opinion) this did not work. At the same time, I found out that the engine will idle at 1300RPM with P-Port only, with or without a close-up butterfly, vs 2000RPM by some claims. This put an end to any close-up throttle device on my engine.

One does not any need lower idle on an engine running at 7000 or more RPM.

The issue is certainly an interesting scientific problem, however, not necessarily one of any practical purpose on airplane use.

Richard Sohn
N2071U

----- Original Message -----

From: Tracy Crook

To: Rotary motors in aircraft

Sent: Sunday, May 13, 2007 10:27 AM

Subject: [FlyRotary] Re: EC2 smoke question

If the slide-throttle was installed Upstream of the plenum it would work fine. But this would make no sense for the slide-throttle that Paul designed. It is a two-holer designed to be installed right next to the engine ports (P-ported engine). A single hole would be the best for an upstream design.

FWIW, I don't get the whole rational for the slide-throttle. True, it it theoretically the best performing solution but I live in the real world where the small theoretical advantage is outweighed by other factors.

TJ, I forgot to comment on the FBW. It is near (near being a relative term : ) production status but the hold modes are still being worked on and will not be finished before the RV-8 flys and it has been flight proven. I don't sell flight critical stuff that I haven't risked my own tender pink skin on first.

Tracy (Last EC2 update out the door, departing for Colorado Tuesday)