canadagoose

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As usual i've got seaplanes an racers on the brain. I think i just might have a new project this winter.
Could be built easily with open cockpit too. Lets see, all i have to do is buy another Magnum 52 fourstroke.....

dr_wogz

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that is sweet!

What a modified 'DH Comet' for a Schnider cup meet?

CoosBayLumber

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I would think that you could go locate some old Air Trails magazine of the 1930's and develop a concept from one of the cover paintings. Inverted gull wing and open cockpit would be more of that era too. Then, if you want to go after the bad guys who were bringing in Canadian booze and find their hideout, you also have to modify the design with M.G. through the propeller hubs.


Wm.

canadagoose

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Here's a view with open cockpit. BTW the wing on it is an inverted gull although you can't see it.

BMatthews

A little bit DH Comet, a little bit Grumman Skyrocket and a little bit Schneider. Looks like another winner to me!

weskel

what program is that you are using?



looks kool



weskel

canadagoose

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weskel , the program is MetasequoiaLE, very easy to learn although i wish i could be doing this 3D modeling in TurboCad 9 Professional that i just bought. I have a lot to learn with that one. This Metaequoia is more for producing 3D objects for games i think. It is really nice when you have a design in your head and would like to produce a 3D model fast that you can tinker with. This one i had doodled out with a pen and paper first at work when i had a spare minute, on the computer it only took me about 6 hrs seeing i already have many other planes modeled that i can steal parts off of to use or reshape. I think i just might get started drawing 2D plans on TC9 and not wait for fall & winter.

canadagoose

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It seems to just beg for retracts.

canadagoose

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I've decided i'm going to give this one my all to make an RC model out of. A twin engine plane(something i've never built or flown before) should keep things interesting. This is the harder part trying to take the fuselage sections from the Metasequoia model and transform them into nice rounded useable formers in TC. You can see the sections from the Met formers have big flat spots around them.

canadagoose

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Havn't got too much done but at least it's a start. Bin enjoying playing around with my new TurboCad V9 pro anyways.
So far 58" length, span 73", floats 42", for (2) 90 size fourstrokes. I wonder if that will be enough power to make this thing really cruise? Props would be 14x8.

Mike James

That's a pretty airplane, and I hope you build and fly it.

If you build it normally, (meaning not too heavy) I think you'll need a lot less power. One of my early surprises in studying model twins, (which later inspired me to build the King Air B200) was listening to Ramon Tores talk about his C90 at the '87 Scale Masters. His beautiful plane was 25 pounds, and flew quite well on two YS .45 2-strokes.

Remember, it's not only the displacement with multi-engine planes, but also the greatly increased prop disk area. Using 2 .90 four-strokes would probaby be a great deal more power than you need, at the size you've mentioned.

canadagoose

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Wow, 25 lbs and only (2) 45's, i have been thinking this one with 90 fourstrokes might be grossly overpowered. My next option would be (2) Magnum 52 fourstrokes. I just might go that way, maybe slightly scaling it down for those engines. I DO want the thing to have a ton of power but within reason.

canadagoose

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I've gotten alot more drawn, still need to do alot more. Alot time has been spent on the fuse and nacelle
station outlines. I also scaled the bird down 10%. Some other changes were made as well to the 3D model and incorporated into the plan. Wingspan is now 68", wing area is 718 sq in., length overall with floats is 51", overall height w/floats is 21.5". Float length is approx 36". I think 40 fourstroke engines would power this bird well. I plan on now using (2) Magnum 52 fourstrokes seeing that i already have one that's still fairly new. Still alot of work left to do on the plans, but I hope to get building near the end of September or October.
I have a question, how are twin rudders usually hooked up to the servo/s? I want to mount 2 servos for the elevator and rudders directly behind the cockpit which should make hooking up the elevators easy.

Chad Veich

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Canadagoose, lofting of elliptical cross sections is super easy with a CAD program and results in truly accurate results. On a design such as you have here it may be easier than trying to convert them from the cross sections generated from your computer model. Just a thought. It would probably be lengthy but, if there is interest, I will try and explain the process. (which will be much harder than actually doing it!) I really like what you have here, good luck with it. (mind if I steal some of it?)

canadagoose

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Yes i am interested in learning how to loft cross sections. I have been playing around with TurboCad V9 professional that i just bought
and would definetly like to really learn how to use it.

CafeenMan

Very pretty model, but you need to build EXTREMELY light. There isn't a lot of wing there, but there is a lot of surface area. So you have sheer number of components and a lot of drag.

Holes in everything, lots of sandpaper and contest balsa throughout. Don't over-build. I want to see this when it's done. Looks beautiful!

- Paul

canadagoose

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Thanks CafeenMan, i'm sure i can keep the weight down to 8 1/2 lbs or less, I'm shooting for a wing loading of around 25-28 oz/sq ft.
I will use alot of contest balsa in the fuse and tail feathers. For the horizontal stab, i would like to build it like the wing with a symetrical shape and then sheet it so it is very rigid for mounting the vertical stabs to. I will also be laminating the outer wing panel spars so that the main spars start at 1/4" x 1/4" at the root and then go to 1/8" x 1/4" half way out to the wingtip tip. I'll do things like that and also use lightning holes where i can to help keep the weight down.

Terry

CafeenMan

Terry - Take a look at my Rustik design. The horizontal is built-up like you said. It has about 20 1/16" contest balsa ribs, (2) 1/8" square spars and is sheeted with 1/32" contest balsa. All-up weight was a little over 2 oz. and it's extremely strong and rigid. I would trust it on a 2-stroke .90 size plane. Most guys would have used 1/16" sheet, but that more than necessary.

Don't design like current kits. They aren't well done for the most part. Too many weight-gaining compromises to ease building. I seriously hope you build this plane. It has really great lines.

With the wing area, I think you should consider .40 - .50 size 4-strokes. The .90's are too much unless you put on high-pitch props and want to hit 150 mph (which would be cool too)

canadagoose

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Cafeenman, where can i take a look at your Rustik design?
That's what i was planning on using is 1/16 contest grade for the sheeting and then glassed. I was only going with (6) 3/32" ribs per side though. (I tend to build a little heavy).
Take a look at post 13, that's exatly the range of engines i am designing for now, I will be using Magnum fs-52 4c's.

CafeenMan

4-3/4 lbs fully sheeted and fiberglassed with 7 servos and an O.S. .52

http://airfieldmodels.com/gallery_of...stik/index.htm

canadagoose

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That's some beautiful looking work you did on the Rustik, love the inlays. I bet it's one super flyer at only 4 3/4 lbs too! My VeeBee that i designed and built last year had 540 sq. in. of wing area powered by a Magnum fs-52 came out at 5 3/4 lbs with floats and really flies nice at that weight, i hope this one will fly just as good but a little faster would be nice.

canadagoose

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Well, it's been a few years since i had started this thread and i'm finally near completion of a finished model. I had forgot i had posted this thread when the model was just a concept. Here's some pics of the progress. It has a 63" wingspan to be powered with two OS fp 40's or two Saito 45's. The Saitos may be a little too much in terms of weight and vibration for this size model. The model was also constructed at first as an open cockpit then changed back to an enclosed cockpit as originally planned. Quite a few other changes were made as well.

iron eagel

Sweet !!
Nice work ,best wishes for you maiden.