flap/aileron likage: Radiator position/cooling ducts: Kevlar; lightning strikes

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by malbo downunder, Feb 28, 2005.

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  1. Feb 28, 2005 #1

    malbo downunder

    malbo downunder

    malbo downunder

    Member

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    Location:
    Near Euroa, Central Victoria, Australia
    G'day Guys,
    I'd like to tap in to some of the wisdom on this great site if that's OK.
    We are about to start a 4-place version of Steve Rahn's "Vision", & would appreciate advice in the following areas.

    1/. Can anyone describe a flap & aileron linkage which will do the following:- lower slotted flaps AND ailerons together to 10 & 20deg., then flaps ONLY to 30 & 40deg. while (slotted), ailerons stay drooped at 20deg.
    Also flaps AND ailerons to reflex 5 & 10deg. together.

    I believe there was a STOL conversion for Cessna singles which did this but I have never seen any linkage drawings. Also, two aircraft in 1937, the Airspeed A.S. 39 & the General Aircraft G.A.L. 39 "Feet Shadower", used this system, stalled below 35kts & cruised at 38!!. Lift Coefficient was ~3.5.
    I have drawn up a few "sytems" but none of them very elegant,- any suggestions?. Is it "on" to mount one bell-crank on another?. Flutter?

    2/.Any thoughts on the optimum position for a liquid cooled radiator & associated inlet & outlet? My view at this stage is to mount the largest area possible radiator (i.e. thinnest core), in the rear fuselage, the smallest possible inlet with an expanding duct & a reducing duct to an appropriate area outlet. I have read that the inlet area can be as low as 25-30% of the radiator area if the inlet duct is at least 2.5 times as long as the max. radiator dimension,- comments?. Similarly I have read that the outlet area should be 78% of the inlet area,- ????.

    3/.To save weight could Kevlar Style 500 be directly substituted for Style 7725 Bidirectional e-glass as called up in the plans?. (Would you believe NO information is available from DuPont (Australia)!!!). I saw photos of Kevlar gliders built in a U.S. College in Jack Lambie's book "Composites in Homebuilt Aircraft". All Aussie "experts" & academics advise against it but mainly due to it's user unfriendliness.

    4/. How big an issue is lightning strike to composite aircraft & what safegaurds can be built in?.

    Hoping I haven't outlived my welcome,
    Cheers from malbo downunder.
     

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