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Date: Fri, 21 Jul 2006 21:17:45 -0400
From: cbeazley <cbeazley@innovista.net>
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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] PPort, Telescopic intake slide throttle combo
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Hi George/Buly;

I did the slide throttle myself the old fashioned way with a basic 
milling machine.
It differs quite a bit from Paul Lamar's designs.  I don't recommend the 
notch ;)
Works well, although I would do everything different if I did it again.

Copy away!  Let us know how it turns out.

The trombones slide easily enough, requires a few ounces of pressure 
going down,
a bit more (bad guess 16oz?) sliding up.
A lot of head scratching and tricks to get everything to line up well 
enough.
I wasn't sure if it could be realistically done - the next test is at 
temp with airflow.
The Pport (2") and port timing are very similar to the Mazda Lemans 
(slightly later open/close)-
so I have a pretty good map to follow.
Yep, slides well despite the threaded rod.  The rod helped lining things up.
I'm not sure if using linear bearings or teflon bushings along the Mazda 
Lemans design
would be better.

The current setup is ground adjustable - a throttle cable could be 
adapted easily enough.
I am not sure if I will use a wideband Oxygen sensor to get the rough 
tuning or not.
I would certainly be able to tune using standard Oxygen sensors during 
flight.
If nothing else, I can find the tuned lengths and build another lighter 
intake.
I have not built the plane yet, so don't wait for me!
this engine may get car testing time first...

I'll try to throw some material sources, pictures, instructions and 
hints together sometime
after Oshkosh.

Cheers
Cary


Cary,
Love the 'trombone like' intake ( simple and effective) and was wondering if
that was one of PL's slide throttle or something you did yourself.
I would like to copy that if I may, to identify the tuned length of my 1.75"
P-port. Is that threaded rod that you have used on the slide guide?
It would be very interesting indeed if you managed to get an in-flight
adjustable tuned intake and measure it's effectiveness.
Personally I would be happy to just test for the best length at cruise.
Keep up the good work!
George (down under)


 > Hi All;
 > Posted this on the other list - some of you may be interested in this
 > teststand setup as well...
 >
 > I was hoping to have this setup running months ago on the test stand
 > with the Megasquirt - damn work is interfering with more interesting
 > activities...
 > The slide throttle is flush with keg. The notch was to avoid the stock
 > water pump, I wish I had been annoyed enough to chop it up earlier...
 > Same for the adjustable, telescopic intake. I will rebuild almost flush
 > with the engine and at a different angle flush with the bottom of the
 > oil pan after testing.
 > Usable range (from rotor housing face) is 19-27". Could be modified for
 > inflight adjustment.
 > Injector location will probably make it difficult to pull fuel uphill
 > for start - we will see.
 > Based on Francois' (Mistral) comments I will probably move the injectors
 > closer to the keg.
 > Besides, they are mucking up the airflow.
 > One of the objectives was to take advantage of the smaller rotary
 > profile - the height/width could be shrunk further...
 >
 > Cheers
 > Cary