supermarine walrus FLYING BOAT!! - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-28-2006, 09:25 PM   #1
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supermarine walrus FLYING BOAT!!

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OK so.. Im kinda dreaming here but here I go..

IF I were to build a supermarine walrus flying boat biplane, with a 55" wingspan and 45" length, do you think an OS .46 FX would be a sufficient engine to push this plane along nicely or would you recommend a larger engine? I looked at the lanier mariner .40-.46 and it has a 10" larger span AND length compared to the walrus's specs (according to my 1/9th scale views)

I would need a pusher prop so it might not be as powerful..? and it is a flying boat biplane after all so.. Im not sure if the .46 FX would do the trick; would it be best to just go for an OS .60 or a similar engine? or would the .46 be just fine? I also looked at greatplane's .61-.90 seawind and it is about 15" larger in length and span so it seems as if a .46 would be reasonable for the walrus being at a 55" span and 45" length..

I calculated wing loading and it will have around 15oz/square foot IF it were 15lbs. but Im sure I could make it under 10lbs.. so ANYWAYS I really cant make up my mind about the engine size so any input and advice would be real nice I need some quick responses Id love a plane to bring up to the cottage this summer

THANKS, brendan.

the pic below has an 80" span walrus powered by a 120 four stroke if that makes any difference..
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Old 06-29-2006, 09:46 AM   #2
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Hello Brendan,
I fly a Mariner with a OS.46 FX and, to my taste, it is kinda limit.
It flies good but no fancy stuff, it can loop,roll, but thats about it.
Then again the plane is not made for that and water flying is not
the same, you want to just "relax" by the lake and enjoy summer.
Also, in my humble opinion, a 4 stroke woud make it more "scale".
My next water plane will definitly have a 4 stroke, the sound over
water is just awesome.


P.S.Just one man's opinion
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Old 06-29-2006, 09:49 AM   #3
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A couple of things to consider,

The mariner is a mono wing plane and doesn't have the drag of the struts and flying wires. Although the extra wing will give you more lift. It won't and shouldn't be a fireball in the sky.

Call me a purist\---- whatever.....why not go with a 4 stroke??? The 4 stroke will have a more scale sound. If your going to go through the trouble of building this Walrus you might as well do it scale. I imagine you're going to build it from scratch or from plans. If it's an economics factor, you'll have plenty of time to save up for it and you don't HAVE to buy new.
I have a 53" Brian Taylor Harvard, I bought it completed. It has panel lines, rivets, completed cockpit with instruments, levers, buttons, switches the whole package. Only problem is it has a Super Tiger 60 in it. The Harvard looks great, flies nice, it just doesn't SOUND scale. Sounds like a big yellow angry bee going by. (sigh) Like I said, call me a purist\----\whatever.
Chris Rebidoux
Gravity works. I've tested it......often!!!
Building: Jerry Bates 1/4 Chipmunk
Vancouver Vanguard 1/6 Fairey Firefly
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Old 06-29-2006, 06:23 PM   #4
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a 10 to 15 lb airplane needs much more than a 46 - especially flying off water. There is a fella near Victoria who built a Sea Otter ( modernized (?) decendant of the Shagbat) It is about the same size as you are proposing, but unfortunately I'm not sure what engine he is using...

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Old 06-29-2006, 08:39 PM   #5
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Yeah, the drag is going to affect the top speed of the model, but it should still fly well if you keep the weight down. What is important is the hull: once it is off the water, it will fly like it was handlaunched. The hull is the only thing that will get it airborne, and there are lots of cheats to make it work as well as wheels. I had a 48", fully-rigged biplane flying boat, and it got off the water with a 19 diesel, leaped off with an Oliver 3.5, so I'm sure that a 46 will be up to the job; the bipe was "front-engined", same as Sea Otter, so that is an unknown quantity to me.

As far as "loops and rolls" are concerned, please direct me to films, books, whatever, that describe a full-scale Shagbat doing these manoevers...
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Old 07-04-2006, 03:18 PM   #6
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Here is the one Bill Martin built, he's from parksville here on the island... It has about a 60" WS (I can't quit remember, but around there).. And he powers it with a OS FL70 4-STRK...
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Old 07-04-2006, 03:28 PM   #7
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thanks a lot thats the exact engine I was thinking of using on this plane thanks for everyones help! I think I will invest in the 4 stroke.
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