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Old Sep 02, 2003, 05:10 PM
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robotman's Avatar
Bedfordshire UK
Joined Sep 2002
57 Posts
Thrust on a 400 motor with a Gunther prop

Having just bought myself a GWS 50 size ducted fan - I am amazed at the power. It may be old hat to the reast of you but 74grm of thrust from something so small is amazing!! ho does this compare with say a 400 motor on say 9.6v witha Gunther prop. Does anyone have any thrust figures to compare with?
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Old Sep 02, 2003, 05:18 PM
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Larry Dudeck's Avatar
Williamsville, NY, USA
Joined Sep 2000
4,509 Posts
$ for $, amp for amp, a prop will beat an EDF any day.

The silly looking Gunther 125x110 prop is probably the best for DD S400's.

74 gm is about 2.6 oz, a Gunther prop, DD on a S400, 8 cells, will turn about 15Krpm, develop about 11 oz.
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Old Sep 02, 2003, 05:38 PM
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PunkerTFC's Avatar
Iraq
Joined Feb 2001
840 Posts
my gunther on a reverse timed 400, on 8 KANs was making about 13-14.
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Old Sep 02, 2003, 08:42 PM
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LuckyArmpit's Avatar
West Middlesex, PA, US
Joined Jun 2001
4,853 Posts
MAS 5.5x4, 5x5 carbon prop and APC 4.75x4.75....all better than
gunther. I really like the 5x5 carbons. Good pull and good speed.

Dave...
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Old Sep 02, 2003, 08:50 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,206 Posts
I know its not a Gunther, but with a 6x3 Graupner folding prop, on 8 cell 1250SCR NiCds, my 7.2v Speed 400, drew 10.1A (9.1v), 94W, 11760rpm, 288g (10.1oz) static thrust.

Perhaps of interest: the most I ever got out of this particular motor was with 4.1:1 MPJet g/box, 8 cell KAN 950's, 11x5.5 APC E, 7.1A (9.0v) 64W, ~5000rpm, 422g (14.9oz) static thrust.

Cheers, Phil
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