Mini KeilKraft "Comet"

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3 years 1 month ago #24252 by 4Pedalsfly
Replied by 4Pedalsfly on topic Mini KeilKraft "Comet"

Brian Jackson wrote: Chuck glider trim. You didn't say how far the Comet went Colin, hope you got lots of exercise. One trick I remember from long ago is to sand the fin/rudder to an airfoil section. This "lifts" the tail round without much drag. I saw from your photo of the launch that the model was held level. The trick is to trim the model to fly (for example) in left hand circles. With the fin sanded to an airfoil section to induce this, launch the glider with the wings vertical i.e tilt the model 90 degrees to the right, with the nose pointing upwards at about 45 degrees. The resulting launch should result in a rapid climb up and to the right, ending with levelling out and gently turning left. My very last chuck glider was called "Turbo Kid", a design by a member of the BMAS, Ted Horsley , it was trimmed as described. On a warm Sunday afternoon at Beaulieu, I hand launched it as hard as I could, cross wind so that the level out would be into wind, it picked up a thermal, stayed in sight for about ten minutes, and was never seen again. Perhaps trimming for performance isn't such a good idea after all.


Brian - Thanks for your comments - I've watched a couple of videos - searched " Catapult Glider Trimming " which were informative.
With a hard level hand launch my model glided in a straight line with a gentle descent so C.G was about right.
When launched with the catapult it climbed in a straight line till it ran out of energy then promptly stalled and did a great spot landing !!!
In the video they glued a "wash in" "wedge" to the left wing to induce a left turn together with a bit of left rudder.
I would guess that I need the model to roll left in the climb so it can transition into a gentle left glide - am I on the right lines ?
Thanks
Colin.

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3 years 1 month ago #24253 by 4Pedalsfly
Replied by 4Pedalsfly on topic Mini KeilKraft "Comet"

Phillip Ford wrote:

Simon Osborne wrote: I’d be interested in seeing your “chick” glider Phil. Hopefully it will fly as well as lay an egg

It probably will....:lol:

Sorry Colin we seem to have digressed.

I hav fond som plons 4 a Chick Mustank (This sounds like Allo Allo!) and scaled them up to 22 inch wingspan or the length of two A4 sheets end to end. it was originally designed for foam board, what I ain't got so balsa it will be. My Zip file below


Phil - In answer to previous question you will need dihedral - on "Comet" main wings have 5 degrees & tips 25 degrees, looking at your files they show
a dihedral template.
Look forward to following the " Build "

Colin.

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3 years 1 month ago #24254 by Brian
Replied by Brian on topic Mini KeilKraft "Comet"
You are certainly on the right lines Colin. If you are right handed, launch hard right, with left hand trim, the glider will sort itself out and at the top of the climb it will transit to a left hand glide. Have fun and don't land in a "soft patch"

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3 years 1 month ago #24256 by 4Pedalsfly
Replied by 4Pedalsfly on topic Mini KeilKraft "Comet"
Thanks Brian - I'll update after mods, difficult to avoid K9 debris without a tx.
Colin

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