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Old 12-09-2013, 10:51 PM   #1
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Default New sea/snow plane - $75 contest

Well now that winter is here, and I have access to a lake as well, it's time for a suitable plane for both . It's going to be a twin-boom pusher, similar in size and configuration to this one: http://www.wattflyer.com/forums/showthread.php?t=70922

But this time the tail booms are going to extend way out in front and double as floats & skis (well, triple, I suppose ). The central pod is going to rise up above the wing to get the prop out of the water/snow. And we'll have rudders which extend down to the bottom of the floats, doubling as water rudders.

Anyway, I've started on the floats:



They are of rather low-quality "dunnage" foam. I plan to cover them with fibreglas - that's where all the strength will come from. In the picture they have a coat of BIN primer on them which sort of "case hardens" them, making them a lot easier to work with.

More as things progress!

Dave
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Old 12-10-2013, 12:55 AM   #2
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Interesting project Dave. Looking forward to watching as you progress.

Take care and thanks for posting at WattFlyer!!

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Old 12-10-2013, 01:07 AM   #3
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Well, Thats a Unique, Seldom Built Flying Aircraft Enter it in the $75.00 build contest, just add $75.00 build contest to your thread Title.

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Old 12-10-2013, 03:55 AM   #4
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Originally Posted by dgjessing View Post
Well now that winter is here, and I have access to a lake as well, it's time for a suitable plane for both . It's going to be a twin-boom pusher, similar in size and configuration to this one: http://www.wattflyer.com/forums/showthread.php?t=70922
!

Off topic, but does anyone have plans or a source for ski's on our electric model airplanes? I've got a 50 inch wingspan model that would be quite nice for flying in the snow we just got around here.

I'd sooner buy than build though.

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Old 12-10-2013, 05:14 AM   #5
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Here is one link Denny. I thought I had more but cant find them at the moment...

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

another one

http://www.rcmodelworld.com/article.aspx?a=4983

Plus there are a few threads here on WattFlyer about building snow skis IIRC.

I think I need a signature.
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Old 12-10-2013, 09:19 AM   #6
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Skis are something that I keep meaning to try ...

Nigel

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Old 12-11-2013, 12:22 AM   #7
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OK Chellie, I guess I'm in the contest .

This morning I went and got some 3/4 oz glass cloth, 1/2 hour epoxy (as recommended by the hobby shop), mixing cups, and some throw-away brushes. I'm mixing 1/3 of each part of the epoxy and 1/3 denatured alcohol, which gives a nice "brushable" consistency. But it certainly takes more than half an hour to cure. I've done the bottom & sides of the floats - the rest another day. Seems like it's working well.

And I've hot-wire cut the wing halves, and ordered a motor, bec and esc from Heads Up.

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Old 12-12-2013, 11:42 PM   #8
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Progress!



The float/ski/booms are glassed, and the wing has got it's pine spars glued in place. All that stuff weights about 9 oz at this point. The parts are just piled together in their approx. final relation in the picture.

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Old 12-12-2013, 11:50 PM   #9
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Originally Posted by dgjessing View Post
OK Chellie, I guess I'm in the contest .

This morning I went and got some 3/4 oz glass cloth, 1/2 hour epoxy (as recommended by the hobby shop), mixing cups, and some throw-away brushes. I'm mixing 1/3 of each part of the epoxy and 1/3 denatured alcohol, which gives a nice "brushable" consistency. But it certainly takes more than half an hour to cure. I've done the bottom & sides of the floats - the rest another day. Seems like it's working well.

And I've hot-wire cut the wing halves, and ordered a motor, bec and esc from Heads Up.
Great Glad to have you on-board Dave

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Old 12-13-2013, 12:24 AM   #10
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I built this a few back, not a entry, just what I did for 70'ish buck's ,,Bubsteve


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Old 12-13-2013, 07:29 PM   #11
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Originally Posted by stevecooper View Post
I built this a few back, not a entry, just what I did for 70'ish buck's ,,Bubsteve
Looks good Bub!
Was that an Arf that you made it from?
What kind was it?
How does she fly?
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Old 12-13-2013, 11:39 PM   #12
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made it from three chuckGliders, heres another one
bubsteve


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Old 12-13-2013, 11:45 PM   #13
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They fly well,,, both like lots of rudder,, bubsteve


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Old 12-15-2013, 12:55 AM   #14
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Quite a bit of progress today. I painted the float/ski/booms, finished the wing, and stuck everything together.



The servos are salvaged from earlier planes - that's why they don't match .

We're at about 12 1/2 oz now... I'm guessing AUW will be around 18-20 oz when all is said and done. A bit of a lard ball, but that should be good for windy conditions (common in the winter).

Next up, the center pod .

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Old 12-15-2013, 02:51 AM   #15
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Thats gonna be a WoWser Dave, Looks Great
bubsteve

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Old 12-17-2013, 11:57 PM   #16
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Originally Posted by stevecooper View Post
Thats gonna be a WoWser Dave, Looks Great
bubsteve
Thanks!

It's getting heavier



With the motor, ESC, receiver, and a couple of batteries piled in there we're at 28 oz so far . And to make matters worse, it's looking a bit tail heavy. I made the center pod an inch longer than originally planned in order to get the batteries out further in front, but even with that I may need to add some ballast. Oh well, we'll see.

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Old 12-18-2013, 02:26 AM   #17
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Houston,,, were gonna need a bigger Outie!
Looks Great,bubsteve

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Old 12-18-2013, 10:35 AM   #18
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Looking good

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 12-20-2013, 11:24 PM   #19
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Slowly but surely...



It's not getting any lighter . I'm now estimating ~32 oz AUW, including an ounce or so of ballast way out front to get the CG right. I expect it to fly well, but it's going to be a brick .

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Old 12-21-2013, 12:05 AM   #20
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32oz
And the original weight estimate was?

Seriously though is looks impressive.
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Old 12-21-2013, 02:34 PM   #21
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That solid foam & fibreglas stuff is heavy... Next time the floats will be hollow!

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Old 12-22-2013, 11:09 PM   #22
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OK, we're almost ready to fly . All I gotta do is the battery hatch and a "nose cone" for the center fuselage. Based on testing in the yard, I'm pretty sure it's got enough thrust to take off from grass, so I won't have to wait for snow.

The receiver and ESC "waterproofed" with propeller bags:



That won't survive full immersion, but should protect against splashes. I'm trying a "Lemon" receiver, by the way. A couple other club members swear by them...

Unfortunately, that's a 2 oz hunk of cast iron stuck on the front there:



It will be hidden by that foam "nose cone" yet to come. AUW will be right about 30.5 oz . Better than 32, I suppose .

From the rear:



It doesn't look like the weather and/or holiday commitments are going to come together to give maiden flight conditions till the end of the week.

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Old 12-23-2013, 03:02 AM   #23
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Look great. Good luck with the maiden

Happy flying may your crashes be limited and if they are not limited let them be cool.
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Old 12-23-2013, 01:16 PM   #24
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Nicely done Dave ! and +1 on the Lemon rx's. I haven't had a problem with them yet.

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Old 12-24-2013, 10:48 AM   #25
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Heya Dave good luck on the maiden flight.
Crash

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