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Old Oct 17, 2014, 06:25 AM
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A faster Turbo Beaver/ Crack Series plane

Hey guys, just wanted to know if anyone else has been experimenting with motors for the crack series airplanes. I have the turbo beaver and for regular flying and 3d it's great with both the 2s and 3s batteries with the stock 2206 1450kv 26gram motor. The other day however I forgot to change the prop and used the 9 X 4.7 prop with a 3s battery. It was flying faster than ever and I was just smiling like crazy until it slowed down to about 50%. When I brought it in the motor was hot as hades and after waiting for it to cool down the next few flights caused similar 50% power issues. So I pretty much ruined either my motor or my esc. No big deal, but I'm looking for a setup that will be a little faster and more fun for fast sport flying rather than 3D. I'm looking for 3s setups that are fast and run cool. I will put in a 20Amp esc this time (only adds 10 more grams), but I'm looking for motor and prop combos ideas.

So far I've been looking at either the turnigy 3020 (1800kv) which with a 9 X 4.7 prop should put out about 450 grams (about 15.8 ounces) of thrust. I've also been looking at the Emax CF2805 1700kv which is supposed to put out 538 grams (19 ounces) of thrust on a 3s, but I'm not sure what prop was used.

My plane probably weighs in at about 10 ounces with the stock motor and a 3s850mah battery. Any suggestions to make this thing go fast???
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Old Oct 17, 2014, 09:55 AM
Extremely Twisted
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United States, NH, Epping
Joined Oct 2005
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The Beaver is not a happy plane going fast. You will find that at a certain speed you will get some aileron flutter. It is happiest on 3S with a 8x4 prop and a 1400-1500kv motor. It has a lot of drag as well.

On any ~25 gram motor of more than about 1400 KV, you will smoke it before long on a 9" prop and 3S.

If you want to go fast, consider the new MXS-C. It is extremely stiff and has a lot less drag than the Beaver. On the stock set up with 3S and a 8x4 prop it is about as fast as you can go with a flat foamie.

MXS-C Teaser (1 min 12 sec)
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Old Oct 17, 2014, 10:00 AM
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United States, WI, Oshkosh
Joined Feb 2013
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I am not sure why you would try to make a fast beaver. It is design to fly as slow as it can or to be in high alpha manuvers
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Old Oct 18, 2014, 03:31 PM
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Joined Nov 2000
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OK, I had a 1400 KV Blue Wonder on 3S swinging a 9X4,7------burned 'er out... Had a buddy fly'n a Crack Yak on 3S using a 2205- 1800 KV Motrofly motor and an 8040 prop. He loved it ,so ordered one from Subtronics. To say I am happy with this motor is an understatement. The first flight I knew the minute I touched the throttle I had a tiger by the tail. Take off was inches so took her straight up and she never slowed down. Had to try this again, this time rolling all the way up. Got a good 4+ minute flight on the 3S-450. Everything cool. Just might have to
get one of these for my Crack Pitts.

Not more speed------MORE POWER .......

http://www.subsonicplanes.com/Motrolfly_Motors.html

RonJ
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Last edited by RonJ; Oct 18, 2014 at 03:42 PM.
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Old Oct 18, 2014, 03:53 PM
My hovercraft is full of eels.
USA, TN, Gallatin
Joined Aug 2009
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Yep. That's my CTB setup too. Motrolfly 2205-1800 / FM-12 ESC combo on 3S 500s with an 8x4 prop. It's about as fast as this airframe can handle and it's just oodles of fun. I love this plane with this setup.
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Old Oct 18, 2014, 06:33 PM
John
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United States, CA, Heber
Joined Sep 2012
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I love that motor too. I don't have a CTB though. I'm running it on a CP. If you want to change it up a bit try a CF prop. Big difference. I put a 8x4.5 on my CP and wow. I orderd a 8x4 for the CP since the want to push my luck with a 8x4.5 on a 1800kv motor on 3s
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Old Oct 19, 2014, 09:02 AM
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Sparta,WI,USA
Joined Nov 2000
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Hey jk6672,

By CF I assume you mean Carbon Fiber. Where do you get them ? Been using GWS 8040HD's. Might try their slow flyers. The CF prop sounds interesting.

RonJ
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Old Oct 19, 2014, 09:41 AM
John
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United States, CA, Heber
Joined Sep 2012
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I ordered the 8x4 here:
http://www.espritmodel.com/pt-propel...bon-fiber.aspx

And the 8x4.5 here:
http://www.altitudehobbies.com/multi...-cw-and-1x-ccw
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Old Oct 19, 2014, 10:14 AM
My hovercraft is full of eels.
USA, TN, Gallatin
Joined Aug 2009
3,410 Posts
Man, those are sweet but I have this bad habit of flying into things with my CTB. Shrubberies, picnic tables, the ground... Inverted landings are not uncommon. A few weeks ago, I was flying it with one wheel. I broke an axle and forgot to fix it before charging 3 packs for the next morning's flying. I had to discharge those packs! One wheel landings pretty much always result in a prop smack when there is literally one wheel!
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Old Oct 19, 2014, 11:40 AM
ProBro Spaz
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Buffalo, NY
Joined Aug 2004
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http://www.gothelirc.com/shopexd.asp?id=1288
these are great, and 1.50 each, very stiff and don't break easy, 5mm hub might need to drill out but they drill nice
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Old Oct 19, 2014, 11:52 AM
John
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United States, CA, Heber
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Spas, how do you like the Gemfan Nylon / Carbon Fiber reinforce over the carbon fiber? (besides price point)
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Old Oct 19, 2014, 03:34 PM
ProBro Spaz
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Buffalo, NY
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i've never had a carbon (cloth) prop, i cant see spending that when the carbon filled plastic ones are so good at this size, they are shockingly stiff compared to the simple plastic ones
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Old Oct 19, 2014, 03:37 PM
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United States, WI, Oshkosh
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agreed with above, APC is fine.
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Old Oct 19, 2014, 04:35 PM
ProBro Spaz
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Buffalo, NY
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Quote:
Originally Posted by benskoning View Post
agreed with above, APC is fine.
APC are glass filled the gemfan carbon filled are even better
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Old Oct 19, 2014, 04:42 PM
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United States, WI, Oshkosh
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Quote:
Originally Posted by spastic View Post
APC are glass filled the gemfan carbon filled are even better
hmm, is there really much of a difference?
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