Author Topic: Cold Draft, 2m Monoplane  (Read 1837 times)

Online Joe Wotton

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Re: Cold Draft, 2m Monoplane
« Reply #30 on: 24, November 2019, 05:56:27 pm »
Hi Tom,just wondering if you have had any more flights with the model,am very interested in how it is coming along.
Cheers Joe

Offline Thomas David

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Re: Cold Draft, 2m Monoplane
« Reply #31 on: 24, November 2019, 06:42:07 pm »
Hi Joe,


I've had 40 flights with it now. It seems more promising the more I fly it. Biggest complaint is probably the snaps, you need to let them off a bit early, generally not very crisp. I think on a windy day it could do with a bit less drag too, but I haven't flown it on a windy day to be sure.


I think I'll build a new wing over the next few weeks with a thinner tip section, sharper le at the root, and slightly bigger ailerons at the tip. If that works I'll think about more updates and hopefully build a whole new one with more minor modifications ready for next season. I need a spare plane for the Europeans so must be a little industrious.


Cheers,


Tom

Offline Thomas David

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Re: Cold Draft, 2m Monoplane
« Reply #32 on: 14, December 2019, 03:38:12 pm »
Hi


I've had about 70 flights on it now. I think its pretty good. I've now updated the design, reduced the root and tip section thickness (from 11% to 10% at the root and 16% to 12% at the tip), changed the sections (max thickness further back at the root, forward at the tip), increased aileron tip chord and extended it right to the tip, taken a lot of meat off most of the ply parts and a few of the balsa parts. Hopefully this will make it a bit less draggy and make snaps a bit more snappy in the F sequence.


Just in case anyone fancies building one I've shared all the dxf files ready for cutting here: https://drive.google.com/file/d/1hOAvlCXIPwTVFGkvrd2VK21hugyZUIvv/view?usp=sharing


You'll need:
about 70 sheets of 3/32" x 36"x4") contest grade or light balsa
5 sheeets of 1/16"x900mm x 300mm birch ply
some 1/4" light balsa stick for the wing spars
some 1/4" light balsa sheet for the hinge lines and LE stock
some 3/8" sheet, I think for the fin LE stock and hinge line
a wing and tail tube and matching sleeves. I got them from Engel. Holes are 26mm and 13mm in the wing and tail ribs respectively.
some 8mm and 6mm dowel for anti rotation pins.
an undercarriage, I use the longest falcon one from Bondaero.
A hacker Q80, unless you want to modify the firewall.


enjoy,


Tom

Offline Peter Jenkins

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Re: Cold Draft, 2m Monoplane
« Reply #33 on: 14, December 2019, 06:02:13 pm »
Well done Tom!  Impressive.

Offline Thomas David

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Re: Cold Draft, 2m Monoplane
« Reply #34 on: 12, January 2020, 07:09:48 pm »
Started work on the updated wings.

Offline Thomas David

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Re: Cold Draft, 2m Monoplane
« Reply #35 on: 15, January 2020, 09:47:17 am »
Wings sheeted, LE and hinge line stock next.

Offline Thomas David

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Re: Cold Draft, 2m Monoplane
« Reply #36 on: 20, January 2020, 10:48:45 pm »
Covered the wings and started work on the fuselage.

Offline Thomas David

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Re: Cold Draft, 2m Monoplane
« Reply #37 on: Yesterday at 11:02:13 pm »
I had a good weekend flying the new wings. The changes seem to have the desired effect so now I just need to finish the new fuselage and start on a third set of wings to go on it.
« Last Edit: Today at 08:48:21 am by Thomas David »