Surface Area of Cowling

[noodles]

Hello,

 

I'm interested in doing some heat transfer calculations. I have some interesting ideas regarding the ever-present cooling issues related to the rotary.

 

I am cozyless and have no available dimensions. I guess you could say I haven't taken the plunge yet. I was wondering if one of you fine aviators could provide me with a rough estimation of the surface area for the engine cowling. All I need is some off the hip estimations

 

I would also like to know what the average wind velocity generated by the prop as it idles. I don't need it after the prop, I need it prior to it. I understand that the velocity will vary as it gets closer. I figure any rough estimate across the engine cowl will be sufficient.

 

Thank you gentleman

[John Slade]

Hi,

I just measured the custom cowl I built for my 13B powered Cozy IV. See http://kgarden.com/cozy/cowl.htm for pictures. It seemed like 100 sq ft during finishing, but my ROUGH guess at surface area of the upper cowl is 12 sq ft, not counting 4 sq ft of area over the wing roots. The lower cowl has a little less surface area - maybe 10sq ft. plus another 4 sq ft under the wing roots. Hope this helps.

John Slade

[noodles]

Thanks, that should help out.

 

12 and 10 huh, thanks

 

You wouldn't know the answer to my second question would you. I would like to know an approximate wind velocity over the engine cowl when the plane is idling. I know that your plane isn't flyng yet, but figured someone else might now.

[John Slade]

Sorry, but I have no data on windmilling prop air speeds. Standing behind a Cessna 172 with the engine running, I might guess at 30mph.