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Old Mar 06, 2010, 10:46 PM
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GNieuwoudt's Avatar
Joined Apr 2003
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Budget Setup for Supra

I want to convert my Supra to Electric. I will compete in the limited height launch where the launch is limited to 200m and 30 seconds motor on. Would appreciate any advice on low cost motors, 3S (limited space) and prop sizing which would launch a 2-2.5kg glider in 30 seconds to 200m.

Cheers
Gert
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Old Mar 06, 2010, 11:42 PM
Slope and thermal
Christchurch, New Zealand
Joined Apr 2003
402 Posts
The following is copied from:
http://www.hyperflight.co.uk/products.asp?code=SUPRA-E

Powertrain Suggestions
Hacker A20-8XL geared 4.4:1, 3S 1.5Ah LiPo, 20x13 RF prop (1900 fpm, 45A) - recommended
Hacker A20-6XL geared 4.4:1, 3S 1.5Ah LiPo, 16x9 Aeronaut prop (1700 fpm, 46A)
Mega 16/25/2 geared 4.4:1, 3S 1.6Ah LiPo, 16x10 Aeronaut prop (1900 fpm, 57A)
Mega 16/25/3 geared 4.4:1, 3S 1.5Ah LiPo, 20x13 RF prop on +7 spinner (2000 fpm, 49A)
Mega 16/25/2 geared 6.7:1, 3S 1.6Ah LiPo, 20x13 RF prop (2200 fpm, 56A)
Mega 16/25/3 geared 6.7:1, 4S 1.3Ah LiPo, 23x12 RF prop on +7 spinner (2100 fpm, 42A)
Kontronik Fun 480-33 geared 5.2:1, 3S 2Ah LiPo, 18x12 prop (2700fpm, 95A) - tail weight reqd
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Old Mar 07, 2010, 07:34 AM
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I was wondering if an outrunner would do the trick, like Suppo or E-flite. Does anybody know how much power is required for a 2-2.5kg model to launch at a respectable (not vertical!) speed.
Cheesrs
Gert
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Old Mar 07, 2010, 09:18 AM
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Ralph Weaver's Avatar
Indianapolis, IN USA
Joined Nov 2000
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http://www.aircraft-world.com/shopexd.asp?id=7147
http://www.rcgroups.com/forums/showt...light=hyperion

I have an older version of the 3025 in my 3m sailplane and it flys great.
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Old Mar 07, 2010, 10:36 AM
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GNieuwoudt's Avatar
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Thanks Ralph. This looks promissing, and the price is also affordable!
Cheers
Gert
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Old Mar 07, 2010, 01:37 PM
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Ralph Weaver's Avatar
Indianapolis, IN USA
Joined Nov 2000
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I'm a big fan of Neu motors etc. when you need the absoslute best, but like most things, you can get 80% of the performance for 30% of the price. I also have a couple Hyperion controllers and they perform well.
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Old Mar 08, 2010, 01:56 AM
Slope and thermal
Christchurch, New Zealand
Joined Apr 2003
402 Posts
I normally use outrunners too. However, the Supra fuselage is narrow.
Be careful !!
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Old Mar 08, 2010, 04:07 AM
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Neil Stainton's Avatar
United Kingdom, England, Stratford-upon-Avon
Joined Feb 2001
3,893 Posts
These two ARE outrunners. I don't think any DD outruner will fit (and give you the 8m/s climb rate), but these geared outrunners fit well, give excellent performance, and aren't too expensive.

Powertrain Suggestions
Hacker A20-8XL geared 4.4:1, 3S 1.5Ah LiPo, 20x13 RF prop (1900 fpm, 45A) - recommended
Hacker A20-6XL geared 4.4:1, 3S 1.5Ah LiPo, 16x9 Aeronaut prop (1700 fpm, 46A)


I will probably use a geared A20-6XL on my next Supra-e. BTW my first Supra-e was also a modified glider. Cutting the glider fin and pod and using a stock electric nosecone makes this an easy modification.

Neil.

Quote:
Originally Posted by GNieuwoudt View Post
I was wondering if an outrunner would do the trick, like Suppo or E-flite. Does anybody know how much power is required for a 2-2.5kg model to launch at a respectable (not vertical!) speed.
Cheesrs
Gert
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Old Mar 08, 2010, 04:09 AM
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United Kingdom, England, Stratford-upon-Avon
Joined Feb 2001
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Thanks for attributing Hyperflight Eric.

Neil.

Quote:
Originally Posted by EricSoar View Post
The following is copied from:
http://www.hyperflight.co.uk/products.asp?code=SUPRA-E

Powertrain Suggestions
Hacker A20-8XL geared 4.4:1, 3S 1.5Ah LiPo, 20x13 RF prop (1900 fpm, 45A) - recommended
Hacker A20-6XL geared 4.4:1, 3S 1.5Ah LiPo, 16x9 Aeronaut prop (1700 fpm, 46A)
Mega 16/25/2 geared 4.4:1, 3S 1.6Ah LiPo, 16x10 Aeronaut prop (1900 fpm, 57A)
Mega 16/25/3 geared 4.4:1, 3S 1.5Ah LiPo, 20x13 RF prop on +7 spinner (2000 fpm, 49A)
Mega 16/25/2 geared 6.7:1, 3S 1.6Ah LiPo, 20x13 RF prop (2200 fpm, 56A)
Mega 16/25/3 geared 6.7:1, 4S 1.3Ah LiPo, 23x12 RF prop on +7 spinner (2100 fpm, 42A)
Kontronik Fun 480-33 geared 5.2:1, 3S 2Ah LiPo, 18x12 prop (2700fpm, 95A) - tail weight reqd
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Old Mar 08, 2010, 06:53 AM
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Indianapolis, IN USA
Joined Nov 2000
2,305 Posts
When using the Hyperion outrunner in my Topaz, I had to run the wires externally, but the new mounting method that Hyperion has for sailplanes might fix that.
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