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jesse farr wrote:
Ernest: On a delta, surely there is plenty of room in front of your wheel/tire combinations to mount radiators in wing strake leading edge. What is wrong with that?
jofarr, soddy tn
Nothing 'wrong' with it. Just all those compromises again 8*)
A duct behind the wheel well offers the advantage of:
-the space Kelly is referring to is the baggage compartment. A sufficiently sized duct eliminates a large portion of the baggage capacity.
-a more favorable CG benefit by moving the radiators and duct further aft. Leads to less trim drag.
-the wheel wells are very dirty aerodynamically. I've been hoping to fold the wheel well drag into the cooling drag (two birds, one stone)
-I was hoping that extra airflow through the duct and exiting just before the trailing edge would push back the elevon washout point, providing more authority for a slower landing.
-lack of complicating aircraft structure (I'd have to remove one rib tie) would allow for a self-contained, fiberglass duct that would bolt up from the bottom and drop down to the ground for servicing/inspection/redesign.
Kelly's proposed placement has the advantage of:
-putting the entrance directly into the propwash
-possibly combining the entrance step with the cooling intake, eliminating at least one external 'appendage'
-taking cabin heat directly off the cooling radiator with a very simple duct extension
-shorter coolant lines
-very solid mounting options in the form of the Station 3 Extension, which is 5/8x.035 4130 tube (the rear mounting proposal relies on the much less substantial 3/8x.035 tube rib and .020 stainless steel sheet metal rib struts for support).
-a correctly designed exit would hopefully push back the stagnation point on the top surface of the fuselage, leading to better cruise speed and efficiency
Will reduction in wheel well and trim drag trump moving the stagnation point? Will the addition of another 8 to 10ft of 1" tube filled with coolant change the equation to a great extent? Does the ability to remove and easily build a new and improved duct offer more advantage than quick and easy cabin heat? Will Rachel learn here lesson and finally leave Edwardo?
For these answers and more, tune in next time to...
"As the Spinner Turns"
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