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Old Feb 21, 2004, 11:56 AM
FICKLE FLYER
tlh101's Avatar
Corpus Christi, Texas, United States
Joined Dec 2002
1,221 Posts
Need a Good Scale Model for Geared Speed 400

I have a Speed 400 motor with a choice of 1.6 or 2.1 / 1 gear box, Sprite 25 amp speed control, & a 9cell 1100 NiMh pack. I nedd recommendation for a good scale bird to use this set-up in.
Thanks
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Old Feb 21, 2004, 12:11 PM
FLYER spelled I-squared-R
fliir's Avatar
Grand Rapids, Michigan
Joined Sep 2001
1,622 Posts
Where to start?

What era do you want?

Military or Civilian?

There are great WW1 birds (AerodromeRC, Peter Rake, etc), lots of nice post WW2 civilian birds., etc.

Narrow your interest a little and we can give you more focused suggestions.
David
(currently building a SP400 Fokker DVII)
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Old Feb 21, 2004, 01:19 PM
FICKLE FLYER
tlh101's Avatar
Corpus Christi, Texas, United States
Joined Dec 2002
1,221 Posts
Actually, I like most any scale subject. WWI, Golden Age, Racers, WWII & General Aviation. I just want something that flyes well, looks cool and will utilize the gear I already have. I fly glow scale aircraft and putter around with Indoor electrics as well. Wind is an issue in this area, but, if I get out early enough in the day, I can fly most anything.
Looking for info on models that guys have actually flown had good results with.
Terry
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Old Feb 21, 2004, 01:45 PM
ARFs make me BARF
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United States, MI, Roseville
Joined Dec 2000
8,816 Posts
Fliir, your Mossie is headed for the mag! They have it in thier hands as we speak. Don't know when though.

TLH, you could make a really neat P51 C from my 42" plan if you scale to 33" or so. Same with the bigger Tony,or P40. Buy another $6.00 motor and box, and you can do any of my twins witha gearbox, Mossie, '25,'26,'61,Whirlwind,Neptune,Mohawk
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Old Feb 21, 2004, 02:11 PM
Imagine That!
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Tularosa, New Mexico, United States
Joined Jan 2003
1,638 Posts
T-34

How about a T-34A for direct-drive Speed 400? Ought to fit right in at Corpus Christi!

It's a built-up kit, fairly fast and aerobatic. I have a few of these kits available. Please PM for details.

Tom
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Old Feb 21, 2004, 05:12 PM
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radfordc's Avatar
Lansing, KS, USA
Joined Jan 2002
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Re: Need a Good Scale Model for Geared Speed 400

Quote:
Originally posted by tlh101
I have a Speed 400 motor with a choice of 1.6 or 2.1 / 1 gear box, Sprite 25 amp speed control, & a 9cell 1100 NiMh pack. I nedd recommendation for a good scale bird to use this set-up in.
Thanks
You will have to turn a bit smaller prop with this setup to avoid overamping the motor. A S400 doesn't really do well over 10 amps. Maybe a 6x4 on the 1.6 or a 7x5 on the 2.1.

I use an 8 cell pack and a 3:1 box turning a 10x7 slo fly prop on a Peter Rake 38" SE5. This combo will pull over 10 amps static, but I don't use full throttle much.

Charlie
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Old Feb 21, 2004, 11:24 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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I disagree. Many people run 6/3 to 6/4 props direct on a 400 with 7 cells and have no problems.It depends on cell # and type, as well as which motor you have. I run 5/5 APC's on 8 cells and don't cook motors, but I get them air too.
The formula is to multiply the ratio of the box X original pitch to get new pitch, and square root of the box to get new diameter and pull same amps as DD.
TLH doesn't say which 400 he has.Could be a 4.8(hot) or 7.2-8.4(mild wind) motor, and this makes a huge diff. Agreed, keep them under 10 amps though.
Also, prop selection depends on airframe type, smooth liking 1:1 dia/pitch, somewhat draggy liking 1.5:1, and draggy liking 2:1 diameter/pitch ratio.
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Old Feb 22, 2004, 04:32 AM
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East Anglia, UK
Joined Sep 2002
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Good points. On a 6v 400 6x4 is doable on 7 cells, 6x3 is doable on 8.

More than that and its no real gain and short motor life.

400's seem to like volts, rather than curent, to do their best, and then require more gears. Anything less than 2:1 ratio rather indicates a warbird type plane than a slow floater.

Probably 6x4 or 7x5 prop on those sorts of ratios. certain on 3s1p lipo a 6x4 and 2:1 box looks a very nice match. or 7x5 on 8 cells.

That's the sort of thing I'd want to put in a 30" span warbird, and shoot for about a 16-18oz AUW.
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Old Feb 22, 2004, 10:03 AM
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Lansing, KS, USA
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Quote:
Originally posted by mrittinger
I disagree. Many people run 6/3 to 6/4 props direct on a 400 with 7 cells and have no problems
Correct. But, he has a nine cell pack. DD with a 6x4 P-Calc predicts over 17 amps!

Charlie
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