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Old Feb 09, 2012, 03:32 PM
1/2as actually fit in my car
United States, PA, West Grove
Joined Aug 2011
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thinking about building r/c killer bee

i wanna build an r/c killer bee. now my question isnt how i should do it. but what would be a good plane to use it on. my build history is only 2 herr cubs. ive been flying for years but everything ive had was an arf our bought used. ive also thought about converting an electric like i did with a goldberg tiger 400. anyone have any thoughts. as long as its pretty easy to build i should be fine.
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Old Feb 10, 2012, 04:20 PM
Tiny diesels.... I love 'em
United Kingdom, England, London
Joined Aug 2011
224 Posts
A .049 stik would be a good simple build and great to fly!
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Old Feb 10, 2012, 07:15 PM
1/2as actually fit in my car
United States, PA, West Grove
Joined Aug 2011
69 Posts
i have been wanting a stick for a while maybe ill go that way.
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Old Feb 10, 2012, 07:37 PM
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ozmo01's Avatar
USA, MO, Ozark
Joined Nov 2006
1,462 Posts
You can beat anything you want with a stick, but you can't beat a stick :-)

here is a nice low wing Joy Stick
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Last edited by ozmo01; Feb 10, 2012 at 07:43 PM.
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Old Feb 12, 2012, 05:54 PM
1/2as actually fit in my car
United States, PA, West Grove
Joined Aug 2011
69 Posts
anyone got any tips for bringing up my rpms? obviously i cant use a spi cylinder with the cox rc conversion. so i was gonna use a black widow cylinder with a killer bee crank and a mylar reed.
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Old Feb 12, 2012, 10:53 PM
I'm going flying!
rcflyer-rick's Avatar
Colchester IL
Joined Oct 2009
145 Posts
I did a baby bee with an 8cc tank. Dual bypass, dual booster (one each side) stainless reed, lapped the crank to the case with toothpaste to polish the front of the crank-back of the case, sanded back of case with 600 grit wet to get a good gasket seal. Drilled out back venturi and cleaned up where the screen would be. rtv over the screwheads. On the 4th run with a 5.5x3 prop I was getting 18,400+ rpm but now it only runs about 1min15 seconds on 8cc's. So if your gonna hop it up be ready to install a larger external fuel tank.
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Old Feb 13, 2012, 12:57 AM
1/2as actually fit in my car
United States, PA, West Grove
Joined Aug 2011
69 Posts
what kind of tooth paste? also while im looking i was thinking about a stick then i had an idea. i miss my dura plane and i have an extra wing from my first herr cub. so i think im gonna build an .049 dura plane look alike with light ply and my spare wing
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Old Feb 14, 2012, 12:52 PM
1/2as actually fit in my car
United States, PA, West Grove
Joined Aug 2011
69 Posts
i was thinking . what if i bore out the throttle too? more air means more power right. if it wouldnt make it so weak id bore out the whole choke tube the throttle mounts to also. there has to be a way to get a decently high rpm r/c conversion.
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Old Feb 16, 2012, 12:04 PM
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xenalook's Avatar
Joined Mar 2008
219 Posts
Quote:
Originally Posted by bushcub View Post
i was thinking . what if i bore out the throttle too? more air means more power right. if it wouldnt make it so weak id bore out the whole choke tube the throttle mounts to also. there has to be a way to get a decently high rpm r/c conversion.
There will be no advantage to boring out the throttle as the opening is already at least 4x the size (in area) of the engine's venturi hole.

By using this product, you will add another 1,000 RPM to your engine:

http://coxengines.ca/product.php?pro...&cat=27&page=1

Plus, use all the other mods you mentioned.

Bernie
www.coxinternational.ca
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Old Feb 16, 2012, 10:14 PM
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RknRusty's Avatar
United States, SC, Columbia
Joined May 2010
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Quote:
Originally Posted by bushcub View Post
anyone got any tips for bringing up my rpms? obviously i cant use a spi cylinder with the cox rc conversion. so i was gonna use a black widow cylinder with a killer bee crank and a mylar reed.
The #1 BW cylinder has SPI. Just get a Surestart cylinder without SPI. It's dual ported and fluted, a good performer.
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Old Feb 17, 2012, 10:37 AM
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This cylinder is non-SPI:

http://coxengines.ca/product.php?pro...&cat=27&page=1

This one has SPI:

http://coxengines.ca/product.php?pro...&cat=27&page=1

Bernie
www.coxinternational.ca
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Old Feb 17, 2012, 10:53 AM
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Western KY
Joined Sep 2003
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Here's another option to consider from COX International:

http://coxengines.ca/product.php?pro...&cat=13&page=1

andrew
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Old Feb 17, 2012, 12:12 PM
www.coxinternational.ca
xenalook's Avatar
Joined Mar 2008
219 Posts
Unfortunately, that cylinder/piston setup will not work with our rear-mounted throttle.

The throttle works on the principle of airflow reduction, whereas SPI induces airflow increase; therefore negating the throttle's efforts.

Bernie
www.coxinternational.ca
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Old Feb 17, 2012, 01:15 PM
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Western KY
Joined Sep 2003
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Aaaaah! That's right --- he wanted a R/C Bee, not pure Killer Bee. Then, that would also rule out the second option in your earlier post?
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Old Feb 17, 2012, 01:17 PM
www.coxinternational.ca
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Joined Mar 2008
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Correct, that would rule out the 2nd. option. I just showed it for comparison purposes.

Bernie
www.coxinternational.ca
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