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Snowplane ....

Old 11-17-2019, 04:06 PM
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solentlife
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Default Snowplane ....

Here's something I knocked up about 2yrs ago but never finished.





Motor is a 3S Cessna model motor about 1400kv and an 8x5 prop. I dragged out my old FlySky 9x radio and FlySky Module / Rx .. its only going to be a fun snow machine - so not so worried about radio ...
I did have to re-flash the radio though as it had old er9x FW and a few faults ... flashed and she's back 100% ...

Just need to balance it with battery and make the hatch .... give her some colour and protective layer on the sponsons ... she may even prove OK for the water ... who knows.

She has twin rudders and twin set of elevons ....



As usual for me ... its a sketch and cut job ... so no plans I'm afraid ... saves me embarrassment as well if it doesn't work !!
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Old 11-19-2019, 11:32 PM
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Old 11-20-2019, 12:16 AM
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Hi Nigel I had a similar type of plane years ago, they are very hard to fly, dont give the control surface to much throw because they are very sensitive, If you move the motor towards the front, it will be easier to control and if you make it wider that will help alot. if you fly off of water, make sure you have a fishing pole with a tennis ball attached to the line to get the plane back in if its upside down also use Corrosion X spray on the ESC , Receiver and Servo to water proof them.

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Old 11-20-2019, 10:07 AM
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Guy is asking a bit trying to fly something like that with 'mickey mouse' stick setup !!

I hope to give it 'grass test' today ... just see if she controls on the ground ... flight will be later.
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Old 11-20-2019, 02:09 PM
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Oh Dear !!


Back on the bench modifying motor mount !!
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Old 11-20-2019, 05:20 PM
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put some scotch tape on the bottom of the Pontoons so it will slide better
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Old 11-20-2019, 08:35 PM
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There's plenty of tape on the bottom ....

I've added about 5 deg down thrrust - test tomorrow.
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Old 11-20-2019, 10:29 PM
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The elevators and indeed the whole tail has very limited moment arm.
IMHO it needs to be much further (2 or 3 times!) back. This would not only increase their effectiveness but reduce their sensitivity.

I wonder what the effect of the down thrust will be on the tail plane - lift the tail?
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Old 11-21-2019, 12:28 PM
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The downthrust literally made no difference at all .... but the elevators show good authority ...



Its just the model is not being pulled forward level ... the prop is still pivoting her ...


I will now modify to have prop up front ... so it gets DRAGGED instead of PUSHED !!

I was trying to avoid that because on water - she will now suffer water spray into the prop which drastically reduces props thrust and ability to lift off.

Of course - another solution is to forego flight and convert to 'snowboat' only ... that means remove elevators .... move weight back so its a tail heavy machine ... I can keep motor as is then
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Old 11-21-2019, 06:58 PM
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mmmm I may drop back to a 7x6 prop to avoid too much height ...



It also looks like I shall be extending the battery / Rx box back to that stabiliser vertical to accommodate the battery for CoG.
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Old 11-22-2019, 02:34 PM
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That didn't work either ...


So now modify to have prop lower and set back into the model between sponsons ...

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Old 11-22-2019, 03:30 PM
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With that configuration you will most likely struggle flying off water unless it sits very nose high when stationary and you have the thrust to weight to get 'on the plane' almost instantly.
Interesting to see how you get on.
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Old 11-22-2019, 04:17 PM
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Ever started something that you just will not let go on !! This is now one of those for me ...

I WILL GET IT TO WORK !!
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Old 11-22-2019, 04:56 PM
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Tested on house floor and no sign of tipping this time ... she slid like a good'un ... had to add a bit of right thrust to get her to turn better to right ...

Just need to try her on the grass tomorrow ....









I have no doubt she will be a real pig in the air ... but as long as she plays the 'game' on the snow - I'm happy.
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Old 11-22-2019, 10:12 PM
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I think you might be right about actually flying. It is hard to imagine those elevons could generate sufficient force to resist the motor torque and then there is the question of roll stability or rather the lack of it, but on the snow it should be fine.
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Old 11-23-2019, 10:37 AM
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She works !!! But flight ... she hit a few bumps and left ground but within a foot or so was back down ... so she's lacking flight speed with present setup. Maybe try with lighter battery up front ... but then CoG will be further back ..

She turns to right nicely - but barely to left ... But this is on hard ground where rudders are not actually 'biting'. On snow I am hoping it will sit a bit 'in' and then bite,.

I have no idea whether motor could take 4S ... I have my doubts.
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Old 11-24-2019, 06:53 AM
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Hi Nigel Here is my old Hydroplane, I think I sold it years ago

https://wattflyer.com/forums/showthr...oplane+chellie

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Old 11-24-2019, 11:05 AM
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Old 11-24-2019, 01:46 PM
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Its getting there Put the rudder in the center of the thrust line like i have on my hydroplane above, reason being, they dont travel very fast on the ground and need all the thrust help they can get from the motor prop thrust, straighten the motor, remove the thrust angle after placing the rudder in the middle, make the rudder big make the hydroplane a little nose heavy at first, hope that helps, Chellie
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Old 11-24-2019, 03:10 PM
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Hi Chellie .. Great minds think alike ...

I have now added a 3rd rudder ... one in centre to add area and help ..

The motor thrust angle will be sorted once I have got the turning moment ... I reckon I can take out the right thrust .... as to the UP thrust - that will be looked at once I get her moving good on the ground.
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Old 11-24-2019, 03:23 PM
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If I remember Right, a little up thrust is a good thing
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