Patrick wrote:

Can you guy's tell me what torque  is  of  a N/A b13.

Thank's for the Newsletter

Patrick

Prop torque depends on the gear ratio in the  gear box you are using.
Airplanes fly on HP. HP is drag times speed. To go fast with
a given drag coefficient it takes HP not torque.

As far as HP is concerned torque and RPM are interchangeable and
one is just as good as the other.

HP = (Torque X RPM) / 5252

Torque = HP / (RPM / 5252)

or

Torque = (HP X 5252 ) / RPM

The rotary is a low displacement low torque high RPM engine so with 
a gear box it is equivalent to a  high displacement low RPM high torque 
engine with the same HP. Both weigh about the same but only in the case 
of a rotary. Usually a low displacement high RPM piston engine with
gear box will weigh more.

Having said all that the 13B peak torque (not necessarily at peak
HP RPM) is about 160 ft lbs. If the engine is generating 200 HP 
at 7000 RPM the engine torque is 150 ft lbs. The prop torque with 
a 2.85 gear box will be 150 X 2.85 or 427 foot pounds.

Vance, can you send me that article "Let's torque about HP" again. 
I lost it somehow. I found the illustrations but I can't find the 
text.

Paul Lamar
 
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