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gone-ot

02-23-2015 09:01 PM

Aero drag information & data

Something for AeroHead: parasitic drag article

freebeard

02-24-2015 01:03 AM

Thanks for pointing it out, but I'm not seeing much there.

Quote:

It is almost impossible to
calculate the effect of these fittings, consequently only
rough approximations can be made.

True that.

Quote:

All right, now we have the drag force on the wires
and struts but, to make good use of this knowledge, we
should equate this to the amount of power required to
overcome this resistance. To put it another way
"how much hp is this going to cost me?"

From F=kDLV^2 there's a hop. skip and a jump to HP = kDLV^3/375 with no consideration to interference drag, area rule, integration of composite shapes, etc.

gone-ot

02-24-2015 12:09 PM

freebeard, "true," but it sure is nice when someone else does the work and makes the results freely available for others to see & use.

aerohead

02-24-2015 05:37 PM

hop skip and jump

Quote:

Originally Posted by freebeard (Post 469253)

Thanks for pointing it out, but I'm not seeing much there.

True that.

From F=kDLV^2 there's a hop. skip and a jump to HP = kDLV^3/375 with no consideration to interference drag, area rule, integration of composite shapes, etc.

If we want to get into this,Hoerner's 1951 book has everything we'd need to approximate drag as close as aeronautical engineers were doing circa WW-II.
Also,the book 'TECHNICAL AERODYNAMICS of 1935 has complete workups as well.
It's no cakewalk,but it is doable.:p

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