X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

Gary C. Buster LPT wrote:

Ok guys... you've got my interest... I'm running
the NA Dellorto DHLA 48
with the Racing Beat intake....  these guys
obviously have some horns to fit
my carb application... now I need an education
for determining what the size
is (dimension "B" and "C") that I would need for
my application.   Please
remember I am using a ported 12a at 7k rpm max
with Ross 2.85 and Warp Drive
4 blade 68" on my gyro and need a ton of bottom
end, "right now" torque!!!

Does anyone have "the scoop"????

Gary C. Buster LPT

 >

How can you need a "ton of torque at the bottom end"?
propeller torque requirements are rpm to the 4th power
(horsepower cubed) meaning that at low rpm the proper
propeller needs almost no torque. 

A gyro is almost a
static case with maximum design speed well below 90
mph, so your rpm band(from static to cruise speed) is
relatively narrow compared to airplanes in the 200 mph
class -  engines that are "bogged down" in direct
drive applications need to be cammed to bring the
torque peak down for more horsepower at the limited
rpm - but this is not the case with reduction drives
-I think perhaps you are looking at the wrong problem
- Vance

What is the RPM Gary when you tie the gyro down and run
the engine at wide open throttle? What is the RPM when
you fly the gyro at maximum speed?

Paul Lamar
 
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