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400 Size Seaplane

Walrus

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Glenn Howcroft16/04/2007 13:08:00
30 forum posts
11 photos
Hi ...

I've just uploaded a few pics of my latest project to the Gallery pages. A 400 Brushless powered Supermarine Walrus. Pics are before test flight. If it comes back in one piece !!!... i'll add some detail and paint ...

Well i'm off to test it .. fingers crossed.
Glenn Howcroft16/04/2007 14:21:00
30 forum posts
11 photos
Well ...

Flew ok. Hand launched on only 2/3 throttle and of she went. If anything its overpowered. Struggled a bit on the aeleron turns, need coupling with the rudder i think. May also move the CG further back as its a bit nose heavy.
Nick Chudley25/04/2007 10:39:00
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77 forum posts
61 photos
About aileron turns... I got some advice from Ivan Pettigrew,

who makes the world's best plans for flying boats. He says start your turn with the rudder. Then just use the aileron gently to stop the yaw. You won't need much and you will need to return the ailerons to neutral quite quickly, or even reverse them - Due to the fact that the outside wing on a turn is generating a lot more lift. It certainly works with the Catalina I've got and it might work with your little beauty, though I know yours is a very different animal.

How did things go with it on the water
Glenn Howcroft25/04/2007 19:56:00
30 forum posts
11 photos
Hi Nick ...

Thanks for the info .. thinking about the flights with the Walrus it does not need much aileron to start a turn and I do need to put some opposite in, to hold it in the turn . Its a certainly feels very different compared to other scale planes i've had, mainly ww2 fighters ... I'm afraid I've not tried it on the water yet, it's not been sealed against water .... yet , or painted.

Might take a while with work etc .. and the fact I've already started to build a 400 size fun fly, very similar to a Limbo Dancer or Couger. Wings are complete just doing the fuselage.
Nick Chudley26/04/2007 10:05:00
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77 forum posts
61 photos
Work etc! How tiresome! Then you come home from work and get extremely unpopular if you spread aeroplane parts all over the kitchen table. I overdid it with the Catalina - 7ft wingspan and all from plans, not a kit.

400 size fun fly does give you a lot of bangs for your brownie point. I mean I don't like to buy ARTF, but a small kit does go together quickly without too much collateral damage to goodwill at home. Then you can nip out to the park at lunchtime or on the way home. I have a spaniel who gets his exercise at the same time, chasing after them.

Haven't tried to fly the Catalina from water yet, though I did some successful handling tests on a small pond. before I broke it trying to loop-the-loop. The elevator linkage wasn't beefy enough to pull out of the initial dive and it came down for a heavy landing, requiring a return to the kitchen table, etc etc.
Glenn Howcroft26/04/2007 22:37:00
30 forum posts
11 photos
Hi Nick ...

Sorry to hear about the Catalina ... hope the repairs go well.

The wifes been really good about the plane building because I've not built one for nearly a year. I been into fast electric speed boats for the last couple of years. So have been concentrating on them, and Heli's. Although I still have a F27 Stryker foamy to play with. With upgraded motor and cells of course.

I don't usually build from kits either, the Walrus is scratch built as is the 400 fun fly or will be when I finish it !!.

I've had only one true ARTF and that was the Ripmax Spitfire 600 size. Went very well with a Megga 22/20/3E Brushless motor on 8 x IB3800 NiMH Cells and a Cam 9 x 6 folding prop.

I'm actually looking for a good subject for that same power train at the moment. Thinking of maybe a ME109 or maybe doing a 600 size Pushy Cat type.

I'll have to spend a few hours on my CAD pack and see what I can figure out for the 109. I drew up some rough plans for the 600 size Pushy Cat a few months ago but never got round to building it because someone at my local model boat club said they wanted a Walrus for scale day, and I got tied up with that.

Oh the joys of R/C models ...
Nick Chudley27/04/2007 14:13:00
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77 forum posts
61 photos
Yup!

I thought the Ripmax Spitfire looked really good. I don't think you could build a balsa plane with solite covering for that price.

The 600 size Pushy Cat looks as if it could be a lot of fun. I'm a big fan of the kits from Stevens Aero, you can buy them in England from www.electric-planes.co.uk. They've got an Edge 540 which I think would suit your size.

I wonder what size they'll do with the plans of the Hawker Typhoon they're decided to build on this forum.

you'll have to take the plunge with the Walrus sooner or later!! post a photo.
Bustergrunt28/04/2007 09:17:00
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162 forum posts
33 photos
A walrus eh?? Is it an OD? or did you do it from a plan?
Glenn Howcroft28/04/2007 22:50:00
30 forum posts
11 photos
Hi Nick...

I will have a good look at that site. The Ripmax Spit was nice but I didnt like the tail snakes. Both rudder and elevator are by snakes supported at the servo end and where the exited the fuselage at the rear, but no supports in the middle, at least on mine, quite a long unsupported run. This allowed the snakes to flex under load and I had control problems at high speed, i.e coming out of a dive etc. I replaced the snake runs with old stlye hardwood rods with 2mm piano wire ends, solved the problem for me. Flew great after that.

Allo Bustergrunt ...

The Walrus is OD. I got the 3 view from Eduardospage, (hope I spelt that right). anyway if you do a Google search for Eduarospage you'll get there. Excellent for 3 views.

I then imported the 3 view pic into my CAD pack, resized to a 30 inch wingspan and then traced the outlines. I didnt need ribs or the like as I used 1/4 sheet balsa for the wings and 1/8 for the tail bits. There was no plan drawn as such, just the outline.

The hardest bit was the motor mount which is just a layered up balsa box sanded to shape with ply motor mount on the end. All cabane struts where 3 or 4 mm carbon rod, mainly becasue I had it and it made for a quick build.


Bustergrunt29/04/2007 09:30:00
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162 forum posts
33 photos
Excellent, thanks
Bustergrunt29/04/2007 09:38:00
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162 forum posts
33 photos
I'm almost finished an aquastar, very cheap at the moment from the states, and it's a very nice laser cut kit...
Glenn Howcroft29/04/2007 22:40:00
30 forum posts
11 photos
Cool ...

I'd love to see it, post some pics when it's done if you can ..
Nick Chudley30/04/2007 13:25:00
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77 forum posts
61 photos
Hi Glenn - control problems at high speed, that sounds familiar. I've spent many happy rebuilding hours as a result of flimsy linkages and under-powered servos for the elevator. 'Course there are also some muppet moments due to the extension lead for the elevator servo coming unplugged or better still, trying to hand launch without remembering to check the servo reverse switch on my transmitter - that was a short and dramatic flight!

I've just posted a picture of my Aquastar, it's a lovely little plane. I amended mine by installing ailerons and it flies beautifully. I would stay away from water except on calm days though.
Glenn Howcroft30/04/2007 14:40:00
30 forum posts
11 photos
Hi Nick ..

The Aquastar looks very nice, as do the rest of the models. I really like the look of the Gladiator. BTW hows the repairs going on the Catalina ..

I'm still working on the Fun Fly 400, typeing this as the glue sets on the front former actually.

Don't think I'll get round to the 600 size model for a few weeks as I've got a Mini GTM Rigger Hydroplane,(boat), to build for my 12 year old. Bought it unbuilt really cheap from a mate. Should go well on a 4000 rpm/v brushless ... LOL. Hope to get about 30 - 40 mph out of it.... but enough about boats ..

Bustergrunt30/04/2007 19:22:00
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162 forum posts
33 photos
I'll post pics as soon as it's completed
Bustergrunt06/12/2007 20:16:00
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162 forum posts
33 photos
http://www.modelflying.co.uk/sites/3/images/member_albums/27194/TD_004_0.jpg
Bustergrunt06/12/2007 20:17:00
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162 forum posts
33 photos

http://www.modelflying.co.uk/sites/3/images/member_albums/27194/TD_004_0.jpg


Glenn Howcroft06/12/2007 21:14:00
30 forum posts
11 photos

Hi ...

The Aquastar looks great ... let me know how she flies as I'm interested in buying one. Some of the lads at my boat club are building seaplanes for more watery fun. Boats get boring ...LOL

Just uploaded a couple of pics of my 400 Funfly to the Gallery.

Flies well on a brushless 400, 2000kv on 8 x 1400 NiMH cells and a 7 x 5 APC-E prop. Will ROG, do any manouver I can throw at it except prop hang. Needs a outrunner and 3 cell Lipo for that I think ...  will probably fit one in the new year.

 Have fun ...

Bustergrunt06/12/2007 21:29:00
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162 forum posts
33 photos

It flies so good,...i sold it recentley. seriously though, I'm going to get another and mod it a bit to make it better I reckon we're off to Florida on Hols next year and at $34 a shot, i'm going to bring a feew kits home and flog them to some club mates...

As an R/E plane, it flies nicely on brushless and LiPo, 15 mins on a 1200 lipo easily

Nick Chudley07/12/2007 10:57:00
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77 forum posts
61 photos

Hello guys!

 The Limbo dancer looks really good, Glenn, and I was admiring your Polikarpov BG.  Did that come in a kit?

Summer's been good to me.  I can just about build planes as fast as I crash them.  I set the Aquastar on fire when water got in the ESC!  The Catalina is well under control nowadays, very slow and dignified.  Though I did manage some barrel rolls and loops without mishap.  It's actually harder to handle on water than in the air and I'm a bit scared of running out of battery before I get it to the my side of the lake.  That big tail just means it wants to go upwind all the time.

 My present project is a Depron Lancaster, 5' wingspan from Green Air Designs.  I flew it once before it was painted and finished.  Now I'm waiting for some fine weather to complete a proper maiden flight.  It looks really impressive and has a great presence in our front room.  P'raps I should just turn it into a coffee table.  The weather forecast looks terrible.

My favorite 3D plane was a Stevens Aero Stella, which went beautifully for a couple of years before I got carried away trying to do something clever too close to the ground.  I had to fetch a bag to put the bits in.  So now there's a space in my garage for something like that Limbo Dancer.

Cheers

Nick

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