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Old May 09, 2003, 03:46 PM
My cat up close
bipeflyer's Avatar
England
Joined Feb 2001
4,021 Posts
Dornier Do.335 research questions....

I have just got a massively huge urge to scratchbuild a foam/balsa model to run on 2 x Mega Motors, a 16/15/5 in the nose,and a 16/15/5 in the rear,running 2 x 2.5:1 gearboxes,running from a common pack of 16 cells.Can anyone suggest prop sizes please? I'd like to possibly power it with Li Poly cells,so any suggestions there too will be greatly appreciated.2 packs of E Tech. 3s2p 1200's sound ok,or are there other alternatives?
I have an old set of Rhom Air retracts I'd like to fit, but with some lightening performed on them first.

I plan to build it around 52" span,and want to build a foam,(hollowed) fuse with glass skin,and balsa built up wings/tail parts.
Firstly, does anyone know of a source of fuse sections,I have some superb scale 6 views, but would be simpler if I could find some plans (any size) with built up fuselage sections on it.

I just love this aircraft,and have been fighting the urges, but are too overwhelming now to ignore!

Can anyone help please?

Matt
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Old May 09, 2003, 03:53 PM
Registered User
Joined Feb 2003
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Al Masters did a large one (72"?) a few years ago. Plans are available from MAN. Don Srull did a largish rubber powered one ...sometime... not recently.

(I assume you were talking about the Bentley plan?)

Cheers,

Martin
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Old May 09, 2003, 04:33 PM
IWC
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MAN has a set of plans(electric)
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Old May 09, 2003, 05:14 PM
wood basher
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nailsea, N.somerset
Joined Feb 2001
243 Posts
just buy the west wings kit and do a scale up.
go on u know u wont to!!!!
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Old May 09, 2003, 05:54 PM
My cat up close
bipeflyer's Avatar
England
Joined Feb 2001
4,021 Posts
Hey, who needs to buy the kit! I just found a free download here in pdf. format:
http://www.nefkom.net/elektroflug/download_e.htm
The whole West Wings plan....
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Old May 09, 2003, 05:58 PM
My cat up close
bipeflyer's Avatar
England
Joined Feb 2001
4,021 Posts
Whoops! Just realised it is the Don Srull plan after all!
Anyway, will make a perfect basis on which to construct my model from.
OK, just need some answers re. batteries!
BTW Yes, they are the Bently drawings, incredible detail.

Matt.
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Old May 10, 2003, 12:22 AM
ARFs make me BARF
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United States, MI, Roseville
Joined Dec 2000
9,158 Posts
Prop sizes: If you know what amps it draws direct drive, you multiply the old diameter by the square root of the gear ratio, and the old pitch by the gear ratio itself. It will then pull the same amps.

Mark
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Old May 10, 2003, 05:22 PM
Chief Turnip Inspector
Cincinnati, OH USA
Joined Dec 1999
476 Posts
On the s400 Do 335 I built, it drew 22-24 amps on 10 cells, parrallel on 2x7.2 volt motors.

The front prop is 6x4, the rear is 5.5x4.5, but I plan on changing to 5x5, as I believe that the front motor is doing all the work.

The plane is 39in WS, 40 ounce AUW. 312 sq in, a little smaller than you intend.

Hopefully you can use some of the numbers along with Mark's formulas to give you a starting point.

I am interested in how you do, as I have been tempted to put Megas in mine.

I would probably use 16/15/6's in mine with 8 cells (a weight savings), 7x5 in front and 6x6 in back.

This may be a reason to build another..maybe to the two seater!

Ted
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