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-   -   New sea/snow plane - $75 contest (http://www.Wattflyer.com/forums/showthread.php?t=72761)

dgjessing 12-09-2013 10:51 PM

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 :D. 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 :rolleyes:). 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:

http://www.wsukes.com/temp/DSCF3053.JPG

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!

Don Sims 12-10-2013 12:55 AM

Interesting project Dave. Looking forward to watching as you progress.

CHELLIE 12-10-2013 01:07 AM

Well, Thats a Unique, Seldom Built Flying Aircraft :D Enter it in the $75.00 build contest, just add $75.00 build contest to your thread Title. :ws:

kyleservicetech 12-10-2013 03:55 AM

Quote:

Originally Posted by dgjessing (Post 933764)
Well now that winter is here, and I have access to a lake as well, it's time for a suitable plane for both :D. 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.

Larry3215 12-10-2013 05:14 AM

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.

solentlife 12-10-2013 09:19 AM

Skis are something that I keep meaning to try ...

Nigel

dgjessing 12-11-2013 12:22 AM

OK Chellie, I guess I'm in the contest :eek:.

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.

dgjessing 12-12-2013 11:42 PM

Progress!

http://www.wsukes.com/temp/DSCF3055.JPG

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.

CHELLIE 12-12-2013 11:50 PM

Quote:

Originally Posted by dgjessing (Post 933880)
OK Chellie, I guess I'm in the contest :eek:.

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 :ws: Glad to have you on-board Dave :$

stevecooper 12-13-2013 12:24 AM

3 Attachment(s)
I built this a few back:D, not a entry,;) just what I did for 70'ish buck's :ws:,,Bubsteve

Crashalott 12-13-2013 07:29 PM

Quote:

Originally Posted by stevecooper (Post 934087)
I built this a few back:D, not a entry,;) just what I did for 70'ish buck's :ws:,,Bubsteve

Looks good Bub!
Was that an Arf that you made it from?
What kind was it?
How does she fly?
Crash:)

stevecooper 12-13-2013 11:39 PM

3 Attachment(s)
made it from three chuckGliders, heres another one :ws:
bubsteve

stevecooper 12-13-2013 11:45 PM

3 Attachment(s)
They fly well,,, both like lots of rudder,, bubsteve

dgjessing 12-15-2013 12:55 AM

Quite a bit of progress today. I painted the float/ski/booms, finished the wing, and stuck everything together.

http://www.wsukes.com/temp/DSCF3065.JPG

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

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 :D.

stevecooper 12-15-2013 02:51 AM

Thats gonna be a WoWser Dave:D, Looks Great:cool:
bubsteve

dgjessing 12-17-2013 11:57 PM

Quote:

Originally Posted by stevecooper (Post 934433)
Thats gonna be a WoWser Dave:D, Looks Great:cool:
bubsteve

Thanks!

It's getting heavier :rolleyes:

http://www.wsukes.com/temp/DSCF3067.JPG

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.

stevecooper 12-18-2013 02:26 AM

Houston,,, were gonna need a bigger Outie!
Looks Great,bubsteve

CHELLIE 12-18-2013 10:35 AM

Looking good :ws:

dgjessing 12-20-2013 11:24 PM

Slowly but surely...

http://www.wsukes.com/temp/DSCF3073.JPG

It's not getting any lighter :rolleyes:. 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 :roll:.

quorneng 12-21-2013 12:05 AM

32oz :concern:
And the original weight estimate was? ;)

Seriously though is looks impressive.

dgjessing 12-21-2013 02:34 PM

That solid foam & fibreglas stuff is heavy... Next time the floats will be hollow!

dgjessing 12-22-2013 11:09 PM

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:

http://www.wsukes.com/temp/DSCF3075.JPG

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:

http://www.wsukes.com/temp/DSCF3076.JPG

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

From the rear:

http://www.wsukes.com/temp/DSCF3077.JPG

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.

Fishbonez 12-23-2013 03:02 AM

Look great. Good luck with the maiden

dahawk 12-23-2013 01:16 PM

Nicely done Dave ! and +1 on the Lemon rx's. I haven't had a problem with them yet.

Crashalott 12-24-2013 10:48 AM

Heya Dave good luck on the maiden flight.
Crash


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