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Old 01-13-2020, 01:26 PM   #1
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Amphibious Floats


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Are RC scale amphib floats a thing? I dont imagine servos like being wet but I'm sure anything can be built correctly with enough time. I cant say i've ever seen anyone using true amphib retractable gear floats though, so perhaps more trouble than their worth?
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Old 01-13-2020, 04:41 PM   #2
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Re: Amphibious Floats

Waterproof servos are available but IMO the HK $4 ones are expendable for water rudder so I put one of those on one of my floats and it works great(for now).

As far as retractable float gear goes, from what I've seen you have to be damned good to land a full scale one of those on nice tarmac.
My guess is that it would be a pile of luck to land a model on grass with float gear.

But, I would love to see video of somebody pulling it off!
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Old 01-13-2020, 09:28 PM   #3
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Re: Amphibious Floats

Colin,

The PBY Catalina, which you said in an earlier post was a favorite, has been modelled successfully with both retractable wheels and tip floats.

Try plugging "Catalina model airplane retractable floats" into YouTube and one gets a lot of videos
https://www.youtube.com/results?sear...actable+floats

The video "Catalina PBY 5A on Lake Hvaleyrarvatum", about 20 videos down, shows both wheel and tip floats in action as the model enters/leaves water.
Most likely the retract floats use a worm drive mechanism and a shop mock up of such a hidden drive is shown around the sixth video.

And simple foam Catalinas such as Dynams, have use and standard servo to move the tip floats.
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Old 01-14-2020, 09:34 AM   #4
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Re: Amphibious Floats

Dialedin, I believe these smaller versions are different for several reasons.

First, the power to weight far exceeds full scale so a lot of what I have seen can pull themselves off pretty much any surface, although water, snow and even wet grass are the obvious choices.

Second, also in most cases, swapping from floats to wheels, (or skis) and back again is relatively simple and quick. In fact, I have a spare Super Bolt main gear with skis sitting on the shelf as it would be a very quick change out.

Depending on circumstances some can remain on floats full time. Be nice here, except that driving out on a wet runway is a bit damaging, (and gets in your shoes.....).

I love the Cat, as well as the Seawind, both of which have retractable amphibious gear. There are lots of vids and ideas on how to isolate the mechanical drive and/or components from the exposed area. In fact, if I decided to build something large enough scale would be looking at some boat hardware to seal the drives.

ps. The Seamaster mains in the second pic, (built back in the 80's) uses wire legs slid into brass tubes that extend across the fuse and then sealed into the structure. A rubber band or long O-ring adds tension and keeps them there. The nose comes off and the gear removed from a bulkhead fitting. Again, very quick and painless.
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Old 01-14-2020, 12:25 PM   #5
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Re: Amphibious Floats

Quote:
Originally Posted by Cougar429 View Post

..

ps. The Seamaster mains in the second pic, (built back in the 80's) uses wire legs slid into brass tubes that extend across the fuse and then sealed into the structure. A rubber band or long O-ring adds tension and keeps them there. The nose comes off and the gear removed from a bulkhead fitting. Again, very quick and painless.
Thanks for the neat and simple solution for removeable main landing gear on flying boats.
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Old 01-14-2020, 10:28 PM   #6
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Re: Amphibious Floats

Quote:
Originally Posted by Cougar429 View Post

Second, also in most cases, swapping from floats to wheels, (or skis) and back again is relatively simple and quick. In fact, I have a spare Super Bolt main gear with skis sitting on the spares shelf as it would be a very quick change out.
.
Except this one , takes about 2.5 to 3 hours to rig the floats , wire rigging and retractable twin water rudders.

https://photos.google.com/share/AF1Q...s5NlZERktrS1dB

And in flight
https://photos.google.com/share/AF1Q...FCTmtiS0lDR1hR

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Old 01-15-2020, 09:19 AM   #7
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Re: Amphibious Floats

Beautiful bird. If I had a site like that to fly think would leave it on floats.

Love the Twotter. Full size is one of my faves and one day like to do a scale.
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Old 01-15-2020, 01:45 PM   #8
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Re: Amphibious Floats

Quote:
Originally Posted by Cougar429 View Post
Beautiful bird. If I had a site like that to fly think would leave it on floats.

Love the Twotter. Full size is one of my faves and one day like to do a scale.
And with a pair of these on it....PERFECT ! might have to mortgage the house though....LOL
I have seen and had the X45 turbine in hand ( but not the gearbox) and it's about the size of the large beer cans in length overall. The turbine body is on the right with a 330ml pop can for comparison. 10 pounds of thrust equate to be able to turn 22 to 24 inch props in the TP version . Prop in the picture is cut way down for portability.

Start time from sitting to full idle ,about 25 seconds.
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Old 01-16-2020, 10:13 AM   #9
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Re: Amphibious Floats

Yep. Nice engineering. My friend had one on the front of a Pilatus.

Although still love the bark and snort of a big radial, worked and flew behind/under enough of these to appreciate their power/weight.
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