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Old 12-24-2012, 07:51 AM   #11
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Re: Skiis

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Here's a video of the skis Tom designed for us.
That went well

MAAC 44905
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Old 12-25-2012, 10:31 AM   #12
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Re: Skiis

Originally Posted by oldtomcat View Post
If you are looking for a ski that will fly from a foot of fresh powder----you ain't gonna do it
Really nice workmanship Tom!

Here is my challenge to you: double the width of those skiis, put some more curl on the tips & I will put money on you changing your mind about powder snow!

My intention here is not to denigrate anyone's effort at building skiis, I'm just trying to help all get an understanding of what is really happening where the rubber meets the road! (snow meets the skiis) And it really is just that - the point of contact is what counts!

Now we all agree that floats work on powder snow. Here is why:

Look at the contact point from the front of the float - wide & flat right? Vee's are designed to cut in so we want flat. Why wide? Because we are dealing with a low density commodity here. Powder snow is mostly air & we want to be on top of it, just like the wing. We don't build our wings with a wider cord than span do we? No! It's all about getting that wide initial contact with the air. The wider your span, the better the climb rate. Same here!

Now! Lets look at the side profile of the floats. Note that everthing ahead of the C of G on the floats has a positive angle of attack. And it increases exponentially as you get closer to the tip. Very important! Exactly the same as a wing airfoil in flight - to generate that all important "lift" that we need to get up on top of the snow! (Angle of attack) Tip them up , hold them up, pre-load them whatever it takes. If they are sitting flat on the ground they will stay flat on the ground!

Ok, on to the part of the floats behind the C of G of the plane. What purpose does this part serve? None! Chop them off at the step & you will see no change in the way the plane lifts up & takes off! The only reason that you can keep the back end of the floats in place on snow is because they are angled negitive and are up out of the way on take off. Same thing on water. The only thing the back 1/2 of the floats do on water is provide floatation when the plane is static - sitting there looking pretty, they keep the plane level & the tail up out of the water. If the back of the floats contact the water (ie: Not angled up sharp enough) on take off... there will be NO take off! They will keep the nose of the plane down & it will plow along all day & never get up off of the water!
We have the same problem in powder snow, any skii that protrudes back of the C of G on the plane will counter the lifting force of the tips and turn the skiis into snow plows so keep that part as short as possible!
That my friends is why a trike geared plane with skiis will NEVER work in powder snow! There are two skiis behind the C of G forceing one tiny front skii down hard & the more the back ones climb on top the snow the more negitive the angle of attack the whole plane is in!

Hopefully this will help & save a lot of long faces & sore backs (from shovelling) at the flying field next time there is a foot of powder on the runway!
Cheers! Merv
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Old 12-25-2012, 02:49 PM   #13
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Re: Skiis

Well said O P R N.
I know one guy who always claims that the only thing the back of the floats are for is to put the rear gear bracket and the water rudder.
I usually pull the rudder or tilt it up out of the way for snow flying. Don't need it at all on the snow.

Close enough to Canada that I grew up watching HNIC. 12 minute drive to the Detroit/Windsor bridge.
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Old 12-26-2012, 10:39 AM   #14
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Re: Skiis

Tom's Skis are real works of art, the craftsmanship is great.

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Old 12-30-2012, 08:59 AM   #15
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Re: Skiis

I have used the premade wood skis from Unionville Hobbies before, but this time I just grabbed the dubro ones.

Okies.. they are worth the money, just for the "mounting" system alone. The spring they have to stop the skis from tipping up is so easy to use and set up you will love it.
Gravity has a nasty way of reminding you it's a law. Usually when your screaming inverted two feet off the runway....
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Old 12-30-2012, 06:55 PM   #16
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Re: Skiis

Fun Day Today at the field with two other Buddies.
First flights with My new ski's, 110 Rascal on 4" x 18" smooth counter top laminate, 1/8" plywood keel, fiberglass and 3/32 piano wire torsion bar with 15% positive & 15% negative swing from center. At idle I had to hold her back from taxi away.
Our Air Field got more bigger with the six inches of snow everywhere.
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It's All About Ballance
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