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Old Mar 29, 2015, 10:58 AM
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Clancy Aviation Yard Bee 150%

I have a thought and i would like to hear your opinion. How about build 175% bigger yard bee and power it up with a small four stroke engine like saito fa30.
New dimensions: wingspan 51'' length 46'' at 75%
Actually i am looking for an excuse to buy that small saito and yard bee is the one of the simplest balsa models someone can build.
I am a fun of Andy Clancy's planes, i have build and flight with great success a yard bee, that was actually my second plane and after that i jumped to big nitro boys.
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Old Jun 06, 2015, 11:30 AM
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Why not just build a Lazy Bee? The engine is just a tad bit on the powerful side, but it should be alright as long as you're not running wide-open all the time.
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Old Jun 06, 2015, 02:13 PM
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Well because i am lazy! I had start it years ago but never finished it, yard be is a way to easyer to complete.
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Old Jun 06, 2015, 04:31 PM
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Originally Posted by gordinir8 View Post
Well because i am lazy! I had start it years ago but never finished it, yard be is a way to easyer to complete.
Have at it !
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Old Jun 07, 2015, 10:22 PM
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Originally Posted by gordinir8 View Post
Well because i am lazy! I had start it years ago but never finished it, yard be is a way to easyer to complete.
Might want to mod the landing gear; something like this (I'm biased against the original gear design): http://www.rcgroups.com/forums/showp...28&postcount=3

But otherwise, I don't see why it wouldn't work out... What tenbars said - have at it :-)
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Old Nov 24, 2015, 11:28 AM
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Ok here I am again with a project update, i started the construction of the wing, decided to go 150% bigger instead of 175% of the original plan. I have modified the wing to something between lazy bee and yard bee wing in order to make it stronger.

ps:
As Matheweis suggested me above i have decided and start a lazy BIG bee construction which is going really good and you can see it here but it is currently on hold.
http://www.rcgroups.com/forums/showthread.php?t=2490720
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Old Feb 20, 2016, 01:31 AM
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Still wondering what engine to use, id like to put a .30 four stroke but I think it will be way over, what do you think ?
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Old Feb 20, 2016, 08:49 AM
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I have one in storage, pretty sure it has a small brushed motor with a gearbox. That little plane will really struggle with that much weight let alone the power.

Mark
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Old Feb 20, 2016, 11:22 AM
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His is a 50% scaled up version... I think it might be OK.
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Old Feb 20, 2016, 11:41 AM
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Originally Posted by matheweis View Post
Why not just build a Lazy Bee? The engine is just a tad bit on the powerful side, but it should be alright as long as you're not running wide-open all the time.
I built a Lazy Bee and powered it with an O.S. FS20 4 stroke.
It worked fine; plenty of power and would fly great at a low power setting.

I recall that there was some proviso that the 4 stroke engine had to be soft mounted. I hard mounted mine and never had any problem with it.

I'm guessing that the Saito 30 would have quite a bit more power than my 20 but the weight would be similar.

FWIW, I mounted the battery back by the tail to achieve balance.
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Old Feb 20, 2016, 03:02 PM
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I thought that the smallest four stroke was os fs26, was .20 also available?
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Old Feb 20, 2016, 03:17 PM
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For what it's worth I fly a 40" lazy bee with an axi 2808/16, which is about a 300W motor; roughly a 0.20 glow engine. It has enough power to go vertical even with a heavy 3S 4000mAh battery, but it's not uncomfortably fast even at full throttle.

The original Yard Bee was advertised as working well with with 0.010 to a 0.10 glow engine. Using dynamic scaling factors, 150% aircraft will need a 3.375 increase in power to fly the same. Now the cu in to power ratio for glow engines is not quite 1:1, but for these purposes it is close enough. That would give you a range somewhere around 0.025 - 0.30.

I had a standard sized Yard Bee with a 200W motor in it. Watts do scale appropriately, and that would give you over 675W in the 150% ... somewhere around an 0.35 glow equivalent. That little motor was quite hot for the plane and it was difficult to manage at full throttle due to the torque. Speed on the other hand was not an issue due to the prop pitch and max rpm of the motor (essentially I believe I was stalking the prop at higher speeds).

There is an old story about Andy flying a Yard Bee with a 0.061 at 100mph...

Quote:
Originally Posted by Fly View Post
Andy Clancy ... has flown a Yard Bee with a very high performance 0.061 glow reaching 100 MPH speeds (requireing nose down to fight excessive lift, but no tucking!). The ARF has the exact same airfoil as the kit. The standard tiny control rod wire is all that was used in the 100 MPH flight!
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Old Feb 20, 2016, 04:35 PM
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Wow.. I just didn't think a 150% yard bee would need that much power, but I am not a numbers guy.

Will standby for flight results.

Mark
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Old Feb 20, 2016, 04:47 PM
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Wow.. I just didn't think a 150% yard bee would need that much power...
It definitely does not need that much, sorry if it came across that way.

gordinir8 is talking about using a 4-stroke 0.30, which I believe is about the equivalent of a 0.20 2-stroke. From a theory standpoint it seems like a safe range for an experienced pilot - that was all I meant to say.
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Old Feb 20, 2016, 06:13 PM
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I thought that the smallest four stroke was os fs26, was .20 also available?
The 20 came out in 1986. Later on the displacement was increased to 26 then 30.

So the 20 is no longer in production although there will probably be some for sale on Ebay.

A delightful, well mannered engine; would run up to 40 minutes on 4 oz of fuel.
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