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Alan Hilton

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Posts posted by Alan Hilton

  1. 6 hours ago, RICHARD WILLS said:

    I will do a little A4 layout with the retract packs when Ive sorted them . But the basic principal for keeping retracts in foam wings is pretty straightforward and surprisingly forgiving compared to a built up structure . 

    Generally I draw round the marine ply retract plate onto the bottom wing skin . Then draw a second square , 3mm further out .

    I cut into the skin to a depth of about 25mm . and then sink in vertical grain balsa all round the square , a bit like shoring up a grave !

    The ply plate should be a snug fit into the balsa box . If you can keep as much if the foam base to glue to as well , it will help spread the load . 

    Mick Reeves used a slight variation , He simply glued the plates onto the bare foam then drilled through each corner and epoxied pointed dowels in like underpins .. All worked rather well . 

    I have tried both methods and found Richards way the best .On larger models I used 3 mm ply in place of the balsa 

  2. 21 hours ago, Dad_flyer said:

    The main task is to fill this gaping space with power.

    IMG_20210824_191308329.thumb.jpg.fea01cb1e3847e04130d342e12100186.jpg

    All my models are electric, mostly on 4s. This is quite a bit heavier. I think most people would put in 6s, but I shall double up 4s give 8s. It will then share 4s5000mAh with Child_flyer's Black Horse Renegade. The only issue with 8s is that it adds to the cost of the ESC, as mid-range ESCs will only take the voltage of 6s.

     

    I am looking at 4-Max 6366 230kv with probably 20×12 or 20×11 prop.

     

    With batteries the take-off weight is on the edge of 7.5kg. 

     

    The question is, should I try to keep below 7.5kg, or should I live with the 400ft limit?

    I have the same motor in an 80” Laser 200 using 8 s lipos it weighs a bit more than your eagle and is well powered so you should be fine 

    • Like 1
  3. Hi Gordon 

    you are right on the enthalpy of combustion ,but you get a better ratio of fuel to oxygen for an explosive mixture with alcohols so it’s swings and roundabouts 

  4. On 13/08/2021 at 14:23, Geoff S said:

    Indeed. Ian Redshaw lost a beautiful DeHavilland Fox Moth (or a similar passenger bipe with fold-back wings)  when it was on the ground in the pits.  I used to fly my Limbo Dancer in silly winds but landing had to be followed by a very swift retrieval before it blew away or, at least, over.

     

    As for youngsters having no fear, I think it has a lot to do with no responsibility for repair or expense ?   Some years ago the son of one of our members was flying his Dad's Lazy Bee and executing very violent bunts at a supposedly safe altitude.  Actually the altitude was irrelevant when the wing detached itself and floated gently to earth - the same couldn't be said for the fuselage!

    I got the remains and rebuilt it .Its a 1/4 scale leopard moth G ACUS I’m selling because my knackered back won’t cope with large models anymore which is a shame because it flys well and looks the part

  5. Check out the local tip .I have seen several old school British made presses at mine .I have an old Elliot which is built like a tank .I got mine from an engineering firm which used to deal in second hand stuff .Its so heavily built it doubles as a bearing press with no problem 

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