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Old 12-25-2010, 02:21 AM   #1
gramps2161
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Default What determines the length for skis?

I am going to make some skis for a plane that wgt's about 3 lbs wing span of 48" and the length is 36". This is a tricycle landing gear set on this plane.
Is there a formula for length like there is for floats, or is it a matter of what will support the plane's wgt so it does not sink into the snow?
I was going to use tongue depressor to make the skis I can get these from work, and glue them together to get the width I need. The length might be a problem if they need to be longer than 6". Any ideas would be great.

A Merry Christmas to you all.
John
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Old 12-25-2010, 03:46 AM   #2
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I don't see how wingspan would matter in this, as far as the snow is concerned the only signifigant factors would be the weight of the plane it's supporting and the density of the snow supporting it. As any skier knows packed can support a lot more weight than powder.

What you could do is try different size skis and see how well they support the weight they will be expected to (use a dummy weight on the snow, of course). As you don't specify how the weight is distributed on your bird, I can't really help more than that. Sorry

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Old 12-25-2010, 04:15 AM   #3
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Hope this helps Gramps and Happy Holidays to you and Yours, Chellie

http://flyinglindy.homestead.com/skisandfloats.html

http://flyinglindy.homestead.com/aviationandrc.html

http://www.stenulson.net/rcflight/skikits.htm

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Old 12-25-2010, 10:43 AM   #4
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John, I am making a set of snow skis out of balsa. I am making mine out of 1/8" balsa. Mine are going to be 2.5" wide by 9" long. I put the balsa in a pot of warm water for about 2 hours. I could have left them in for a bit longer to make them more flexable. I have not finished them yet. I will try and post some pictures latter.
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Old 12-25-2010, 02:54 PM   #5
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Thanks for the links Chellie will be a big help.

Flywheel if I didn't put the length of the wing in I am sure somebody would of asked.
Most of the snow in my area gets a crust on it pretty quick, so it is open fields or the many ponds around here. Not a whole lot of powder skiing around these parts of the woods.

Andrew post up some pics like to see what you came up with, but not until you open the gifts, and play with your kids first.

Merry Christmas guy's and gals hope you all get some RC toys.
John
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Old 12-25-2010, 03:18 PM   #6
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Hey gramps.....have you thought of floats? You could modify the mounts on factory floats and fly off snow in the winter and water in the summer! If you go homemade you'll want light plywood instead of balsa unless you plan to glass them...floats may be lighter, but the shape may add more drag in the air.

http://www.hobby-lobby.com/super_cub...ueryId=1043665

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Old 12-25-2010, 03:46 PM   #7
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Yes I did think of floats, but like you mentioned very draggy and they need to be I believe 2/3 the lenght of the plane. I just want to make some cheap skis and have some snow fun.
Go to BP Hobby and you can get the floats even cheaper they work for the SC to.
http://www.bphobbies.com/view.asp?id...35&pid=U711588
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Old 12-25-2010, 08:31 PM   #8
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What type of plane do you have? You could mount the skis on the belly if you hand launch and belly land. Less drag with belly mounting. Let's see those pix when done. We opened gifts today, I took the labs for a run in the park (snow covered), and flew one flight with my pusher SU 34. Going to wife's cousin's house in an hour, have a great Xmas evening.


Doug

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Old 01-17-2011, 02:57 PM   #9
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I've found out with tricycle gear if the nose ski is not wide enough or long enough the nose just sinks in fluff snow and if it's not over-powered your are stuck. I have to do a "carrier" launch to get it up to speed quickly so it stays on top of the snow and when landing a very fast taxi is required to keep it from sinking. With a tail dragger and the right horsepower fluffy snow isn't that much of a problem as it gets up on "plane" quickly regardless of the width or length of the skis.
So far this year the snow has remained fluffy so I'm experimenting and making a new set of skis for a trike. They will be 4"wide for the mains and 5" for the nose with the mains a bit longer than usual so maybe they will take some of the load off the nose gear.
Agreed that once the snow packs down or crusts over it really doesn't matter what you use for skis!
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