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New Foam Seaplane project...

New Foam Seaplane project...

Old 11-19-2020, 01:36 PM
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Default New Foam Seaplane project...

Hi to all! I want to share with you my project of building a RC foam seaplane from scratch! And I also will need YOUR HELP during this process...!

Here are a few pictures to start with:
-The existing wing I made years ago which never (really) flew. I want it to fly this time, it is the scale up (2x) of the wing of a balsa glider I have.
-Big bits of foam (house insulation) I will cut through to make the fuselage.
-The rear horizontal tail, existing from an old project I had, if it fits!
-I will mount 2 ducted fan DC motors (1,2 kg thrust each) (Is it enough? Too much?)
-1 (or 2) ESC? Can I use one ESC for both fans? Or 1 each??
-Ruder and elevator (NO AILERONS I don't think in the first instance, unless you tell me it's a bad idea, I want to keep the design SIMPLE)
-11.1v LiPo (the fans can take 14.8v, but I don't have any yet, I'll see how 11.1v works...
........
And more to think about (Size of the vertical tail... length of the fuselage towards the rear...?, How to calculate this...?)


Do please join in a comment, recommend... I will need technical help in the near future!
All the best with your foamies...!
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Old 11-19-2020, 01:51 PM
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The foam would act as the floats, a main floating hull, and 2 floats under the wings near the bent angle to avoid the wing to dive in water... And 2 ducted motors possibly positioned in front of the wing to make it nose heavy (I find it easier to lengthen the fuselage at the rear to compensate for the front weight by just increasing the length of lever arm...
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Old 11-19-2020, 05:13 PM
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Some pictures of your work progress would be great.
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Old 11-20-2020, 03:38 AM
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Originally Posted by xl-racing View Post
Some pictures of your work progress would be great.
I'd love too... but I can't yet... not enough posts!!!!
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Old 11-20-2020, 03:39 AM
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Old 11-20-2020, 03:53 AM
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Now I can...!

Insulation Foam


Plans... Profil

Plans... Front

The existing wing

The existing wing

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Old 11-22-2020, 07:42 PM
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What size of twin EDF you're running at? Those EDF setup are power guzzling compare to standard pusher prop (tractor config).
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Old 11-23-2020, 02:45 AM
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Originally Posted by xl-racing View Post
What size of twin EDF you're running at? Those EDF setup are power guzzling compare to standard pusher prop (tractor config).
I bought 2 x 1.2KG ducted fan, 7cm diameter... good enough?
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Old 11-23-2020, 02:52 AM
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The wing is double the size of an existing balsa glider (i powered with mini motors), So I intend to roughly double other sizes (length of the fuselage... tail plane sizes etc..) to get something which I suppose might be correct (without doing any calculation, I don't know of any to do ....)
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Old 11-28-2020, 08:31 AM
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Testing Neoprene on Foam! It's a NO GO!!!!! it eats it away...!






































Last edited by makehobbyrc; 11-28-2020 at 10:09 AM.
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Old Yesterday, 03:17 AM
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I have a question: is their any better reason to put the DC motors (ducted fans) in front on the wing, or behind the wing? Concerning weight I think i'd rather place them in front (just in front ) of the wing, but is their any aerodynamic, or balance reasons to rather put them behind...? Thank!
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