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Old Jun 25, 2014, 12:06 AM
happy landings
marksp's Avatar
United States, WA, Redmond
Joined Apr 2011
1,412 Posts
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Originally Posted by Doug Bartley View Post
Hi Michael in Toronto! Nice and quiet flite. Sure looks to have adequate power. I watched a 35cc gas Beaver fly a couple of weeks ago, it seemed to need 3/4 throttle to maintain flight....
P160 on 12S is quite a lot of power! I'd guess > 3,000W as my P160 on 10S w/19x10 generates 2730W and it's way over powered! In fact, I was thinking that this airframe would probably work well with a P110 on 8S with AUW of 18 lbs. for landing gear setups. P160 on 12S is getting close to 3D power/weight ratios (3,000W/20lbs = 150W/lb)!

My gas DHC-2 weighs 21 lbs with the Saito FG-33R3 and flies around 3/4 throttle. Good news is that the 4-stroke is still fairly efficient on fuel and sounds wonderful at that RPM!

EP for 'go', gas for show!
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Old Jun 25, 2014, 08:32 AM
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Doug Bartley's Avatar
Canada, ON, Owen Sound
Joined Oct 2008
2,706 Posts
As mentioned, I've only seen one of these fly. It had a 35cc gas engine and seemed to struggle at anything less than 3/4 throttle. A glider it was not. I think he said it was 23 lbs. It ended up in a massive pile of rubble when it hit the only windsock pole on the field on a low pass. Now that was something to see!!
Michael, yours obviously flies very nicely as is, and it quiet too.
I'd liked to see one fly on the 3 cyl glow engine, that may a treat. fwiw Doug B
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Old Jun 25, 2014, 09:55 AM
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SkylineFlyer's Avatar
United States, KY, Louisville
Joined Jul 2008
6,989 Posts
Quote:
Originally Posted by marksp View Post
P160 on 12S is quite a lot of power! I'd guess > 3,000W as my P160 on 10S w/19x10 generates 2730W and it's way over powered! In fact, I was thinking that this airframe would probably work well with a P110 on 8S with AUW of 18 lbs. for landing gear setups. P160 on 12S is getting close to 3D power/weight ratios (3,000W/20lbs = 150W/lb)!

My gas DHC-2 weighs 21 lbs with the Saito FG-33R3 and flies around 3/4 throttle. Good news is that the 4-stroke is still fairly efficient on fuel and sounds wonderful at that RPM!

EP for 'go', gas for show!
My Rimfire 1.60 on 10s swings a 18x10. I think its a perfect match for flying, however it does not have the ability to do any big loops. Matter of fact, I probably need to go to a 20x8. Need more prop and more torque. Going to a 8" pitch might give me that torque to pull through the loop.
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Old Jul 02, 2014, 01:58 PM
Slipping the surly bonds...
summitbill's Avatar
Elizabethton, TN
Joined Jan 2003
192 Posts
Haven't received the Beaver yet, as they are still on backorder, but I've been testing a few props. Here are my results on a Tacon Bigfoot 160 motor with fresh 10s 5,000 mah packs and a Castle 80 amp HV esc:

18x8 Falcon Electric Wood prop, 50 amps max throttle, 1800 watts
18x10 Falcon Electric CF prop, 55 amps max throttle, 1980
20x10 Biela 3 blade CF prop, 75% throttle, 91 amps, 3100 watts
19x10 Biela 3 blade semi scale CF prop, 75-80% throttle, 91 amps 3100 watts

Both of the Biela props are beautiful, but pricey. Gonna go with the semi scale smaller one, as I'll be pretty heavy flying the Beav with the H9 1/4 scale floats. I'll just have to watch the power and not goose it for long at all. At the 80 amp max for the ESC, it's providing about 2600 watts, so all should be good to get it up off the lake.

Bill
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Old Jul 06, 2014, 10:58 AM
E-flyer since 1981
Michael in Toronto's Avatar
Joined Oct 2000
1,491 Posts
Quote:
Originally Posted by marksp View Post
P160 on 12S is quite a lot of power! I'd guess > 3,000W as my P160 on 10S w/19x10 generates 2730W and it's way over powered! In fact, I was thinking that this airframe would probably work well with a P110 on 8S with AUW of 18 lbs. for landing gear setups. P160 on 12S is getting close to 3D power/weight ratios (3,000W/20lbs = 150W/lb)!

My gas DHC-2 weighs 21 lbs with the Saito FG-33R3 and flies around 3/4 throttle. Good news is that the 4-stroke is still fairly efficient on fuel and sounds wonderful at that RPM!

EP for 'go', gas for show!
I'm sure a smaller power system would be OK, but with the 160 system on 12S, balance is perfect.
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Old Jul 07, 2014, 10:15 AM
happy landings
marksp's Avatar
United States, WA, Redmond
Joined Apr 2011
1,412 Posts
Balances well with P/160 and (2) 5S 5,000mAh packed as well. Haven't tried the P110/8S setup, but I bet it'd work out well.

Cheers
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Old Jul 07, 2014, 07:57 PM
Registered User
Joined Jan 2012
102 Posts
Quote:
Originally Posted by barracudahockey View Post
Yep, its a scale plane and flys like one, meaning you need rudder in the turns or it drags the butt around.

Mine flys fine on a 33 even with floats. Its not an Extra but it gets around just fine
I'm flying mine at 5,700' above sea level with a VVRC 40 and it putts around easily at 1/2 throttle with a Biela 19x10 3-blade. I can fly it on the stock tank for well over 20 minutes and not be empty. I also land with a higher power to weight ratio than you guys who (for some unknown reason) use electric power. This airplane really flies well, and slow as all get out. I weighed it ready to fly minus fuel = 19.7 lbs at it flies great. Can't imagine why anyone would need to fly it at 3/4+ throttle, but, then again, some guys just don't understand aerodynamics and flight attitudes.
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Old Jul 07, 2014, 10:55 PM
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United States, MN, Elk River
Joined Oct 2011
99 Posts
Eventually electric will be "the" power source to use. When they get batteries more efficient and smaller, the flying weights will fall into line. I like both gas and electric but I cant stand the chainsaw sound of gas. My 50cc electric biplane sounds more scale than any gas 2 stroke.
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Old Jul 14, 2014, 08:07 PM
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Joined Jan 2012
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Originally Posted by Bipesexual View Post
Eventually electric will be "the" power source to use. When they get batteries more efficient and smaller, the flying weights will fall into line. I like both gas and electric but I cant stand the chainsaw sound of gas. My 50cc electric biplane sounds more scale than any gas 2 stroke.
And there's one of the greatest parts of being alive: you have your opinions, and I have mine. You like what you like, and I love the sound of big four stroke engines, which will always sound more scale than the electric pulse of a digital ESC and a gigantic outrunner spinning an ugly APC prop.

(Of course, you're right about gas two-strokes sounding like chainsaws. The real trick to getting them to sound good is the right shape muffler and propping them right. Then they sound great. Or switch to a gas four stroke...)
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