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Model Forum / Radio Controlled / Air Models / August 2009



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What model should I?

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Steve - 23 Aug 2009 14:38 GMT
A while back I posted a question about four stroke motors, as I was planning
to scratch build one.  I'd no intention of flying the thing (see link)

http://www.youtube.com/watch?v=7X2pe7BrtT8

but simply to see if I could actually build something that runs.  Lots of
learning along the way,  but with new confidence started to plan the build
of a .60(ish)  v-twin four stroke.   The design is supposed to be able swing
a 12x6 prop at 8000 rpm,  so not a screamer,  but what sort of model?

Here is one of these engines I found on Youtube:

http://www.youtube.com/watch?v=OLg9hga-1IA

All I need now is workshop time (the last took nearly two years!), hopefully
get this done for next summer.

I'm thinking of something like an Eindekker or DVIII   as a sport scale?  I
haven't flown RC in many years,  and would intend to find a local seasoned
flyer so model choice needn't be restricted by flying skill (I prefer
building...)

So you seasoned flyers what would you do with a .60 v-twin at the lower end
of the power output range?

TIA

Steve
Martin X. Moleski, SJ - 23 Aug 2009 15:00 GMT
> ... I'm thinking of something like an Eindekker or DVIII as a sport scale? ...

With low-power engines, you want to think "floater."  Low wing loading,
high-aspect ratio.

The Eindecker probably has less drag than the D VIII--a lot less.
I've seen them putt-putt around our field with relatively little
power applied.

Alternatively, treat your engine as if it were a .40 two-stroke
and build that size biplane for it.  WW I models are reported to
be good for heavy engines because they often need a lot of
ballast in the nose to get the CG right.  

                    Marty
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Tim Wescott - 24 Aug 2009 16:50 GMT
> A while back I posted a question about four stroke motors, as I was
> planning to scratch build one.  I'd no intention of flying the thing
[quoted text clipped - 26 lines]
>
> Steve

I'd be inclined toward a 1/6 scale Cub* or similar sized Pietenpol.  If
you don't want to spend the extra time on scale, consider an
appropriately sized Telemaster.

As Marty said, think "floater".  I would add that you probably want to
think "clean"; putting all the trimmings on a biplane adds a _lot_ of
drag.

* A 1/6 scale Cub has a 6-foot wingspan and if built light will fly
adequately on a 0.25 two-stroke.  Your 'V' would be seriously not scale,
but the thing would be glorious in a slow fly-by.

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Steve - 27 Aug 2009 07:36 GMT
>> A while back I posted a question about four stroke motors, as I was
>> planning to scratch build one.  I'd no intention of flying the thing
[quoted text clipped - 38 lines]
> adequately on a 0.25 two-stroke.  Your 'V' would be seriously not scale,
> but the thing would be glorious in a slow fly-by.

Thanks guys.   I had thought Cub,  but hadn't a clue how to relate the
engine power to size.   So I'll put that into the planning.

I have successfully built an all built up balsa 6 foot glider,  so a Cub
from a plan shouldn't be beyond me.

Steve
 
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