George, this reminds me of what Lynn said which was even if we put the hole in the wrong place it will still run and make so much power we will have to hang on, something to that effect. I really like the idea that the p port is not so sensitive. That it does not have to be done just right. Jerry




On Monday, March 14, 2005, at 08:28 PM, George Lendich wrote:

Hello Richard,
Did you see my endhousing pattern?
 
From what I have gathered from you and Jerry is that you open with the Le Mans and close 1.5" later and Jerry closes with the Le Mans and opens 1.5" earlier.
 
So both might be fine, I just seen a little more chance for exhaust contamination for the early opening and am unsure if the later opening sees any compression with the 1.5" manifold tubes - which provide more velocity than the 2" . This velocity is more important at idle( overcoming exhaust and backpressure) and our RPM range around 6,000 to 7,500 rpm. 
George (down under)

Richard, running my engine will be in late summer. It is a time and money thing. Both are in short supply.. Jerry
On Monday, March 14, 2005, at 09:32 PM, Richard Sohn wrote:

Hi Jerry, my p-port opens the same as the LeMans with also 1,5 opening, and still idles fine with just the carb. I am looking at closing it later than it is now for the final tuning, but I do not plan to open it any later. Believe me, I was surprised when I saw the engine run like that the first time. I think on the 13B housing(12A is running now) it looks like a 2" round port will give me about the same characteristics.
How far are you away from running your engine?
 
Richard Sohn
N-2071U
 
 

----- Original Message -----
From: Jerry Hey
To: Rotary motors in aircraft
Sent: Monday, March 14, 2005 3:28 PM
Subject: [FlyRotary] Re: peripheral ports

Hi Richard, my p port opens much later than the Leman's and it closes about the same. It is 1.5 dia so obviously it cannot match the plus two inch of the Leman's port as far as timing is concerned. If you want the actual degree for the opening and closing events I can dig them out for you no problem. I admire your work and intend to copy the one rotor next year. Jerry


On Monday, March 14, 2005, at 01:26 PM, Richard Sohn wrote:



----- Original Message -----
From: Jerry Hey
To: Rotary motors in aircraft
Sent: Monday, March 14, 2005 5:33 AM
Subject: [FlyRotary] Re: peripheral ports


On Monday, March 14, 2005, at 08:02 AM, Paul wrote:



Paul, all the companies you list sell housings with BIG p - ports and massive overlap. They are designed to develop tremendous hp at high rpm for racing. Of course they don't idle smoothly. These engines have nothing to do with the smaller, conservatively timed p ports that we wish to use as aircraft engines. Jerry

Jerry,

what are you calling consevatively timed p-ports?
Just want to see were I stand with mine.

Richard Sohn
N-2071U
 



 

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