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Lazy Bee help needed

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kevin wild07/12/2011 15:06:40
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Hi
I'm having a spot of bother. I've built an indoor lazy bee from a three view drawing i found on on the net and it flies like a pig
 
with the slightest bit of rudder it just dives for the floor. i tried moving the c of g forward and backwards with no change
 
i thought that it was the hinge line on my rudder being about 11 degrees off the vertical but some more research shows that's how they are. ????
 
I only had my 2 cell 800mah lipos with me last night when i tried to fly it so is it too heavy ? (135g) and 20 inch wing span. might it be tip stalling ????
 
HELP
 
your thoughts please
 
kev

 
 
 

Edited By kevin wild on 07/12/2011 15:14:10

Wingman07/12/2011 15:58:48
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I had the same problem with my Parkzone J3 cub - I eventually found it was caused by the front of the wing having come unstuck from its seat and lifting when trying to turn causing a stall and also a rearward cg which was exacerbating the problem (due to touchy elevator control). So maybe you have something similar or a wing incidence problem. Took ages to suss because in a hall I had to keep turning the model before I could get a grip of what was actually happening.

Edited By Wingman on 07/12/2011 15:59:41

Stephen Jones07/12/2011 16:07:14
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Hi Kevin ,
 
I have made a few Fleas myself and will soon be building a indoor Rc flea too .
Here is a video of mine and and a Killer BEE .http://youtu.be/cz4bvFegI6M

  Excuse my attempts at posting Videos  Doh !

Edited By Stephen Jones on 07/12/2011 16:16:38

Richard Harris07/12/2011 16:58:04
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Kev,
Could it BEE (no pun intended) that you need more positive incidence on the wing? Maybe when the rudder is applied the tip that is lower is tucking under? The built up version has ribs but yours seems to have curved depron wings , with all that under camber may well be too much?
 
Rich
kevin wild07/12/2011 17:57:08
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Hi Rich
 
I've just checked the incidence. 1 degree ?. I'm guessing that's not enough. I never thought to check this when I imported the jpg and traced the outlines ;-(
 
am I right in thinking that I need a lot more on a slow indoor model ?

 
 
kev
 
 
 
 

Edited By kevin wild on 07/12/2011 17:57:33

Richard Harris07/12/2011 18:16:44
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Kev,
To me that's a lot of under camber and not enough positive AOA. But this is only through me building a few rubber powered light weight models many years ago.
 
I think you need BEB's advice on this
 
 
Rich
Stephen Jones07/12/2011 18:19:23
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Hi Kevin ,

Not sure that the problem is with the curved wing . I would play with the incidence as i did on this one , but for me was easy .
Also i have made a small Rc Version but my battery was not powerful enough for more that one circuit , but i did find that the rudder is very sensitive so in order to control the turns i made a trim tab that worked as the rudder then it worked fine .

kevin wild07/12/2011 19:53:59
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Hi
just measured the cad model and there's only one degree of attack
 
any ideas how much ?
 
kev
 
Stephen Jones07/12/2011 19:59:51
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Hi ,
 
I will check for U its a lot i know that for sure .

Stephen Jones07/12/2011 20:52:43
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Hi ,
 
Ok on my Foam Flea the main wing is set 6 degrees positive . I also have plans for built up wing and they have there wings set at 0 .
 




This is The Rc one note the rudder .
 
Stephen Jones07/12/2011 21:14:45
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Hi ,
 
Just Re check all .
 
5 Degrees Positive on rear wing
10 Degrees Positive on Main wings
5 Degrees Down Thrust
 
On both Foam Fleas .
 
But Youre rear wing is a flat plate  

Edited By Stephen Jones on 07/12/2011 21:17:29

kevin wild08/12/2011 09:18:58
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133 forum posts
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thanks.
I can adjust fuz and wing a bit and get 3 degrees. if that doesn't improve things I could remove 10mm from the leading edge. it's a bit of a hack but as a last resort it will give me more AOA
 
I've now found indoor planes on the net with up to 6 degrees of attack so I'm going to give it a go
 
 
thanks again
 
Kev
 
 
kevin wild12/01/2012 16:38:13
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133 forum posts
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thanking you all very much
 
the wind and rain eased enough last weekend so i grabbed the Bee and legged it down the rugby pitch. the mods have improved the flight performance quite a bit. it's now flyable. in fact it's a bit of a hoot. loops are very tight. stall turns crisp and slow speed handling great
 
kev
wayne drinkwater12/01/2012 17:23:07
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I fly foam bees and they are so stable you could learn to fly with them and in a breeze you can almost hover them



Stephen Jones12/01/2012 20:24:56
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Hi ,
 
I have now built two indoor Rc Flying Fleas ready for me and my son to have a play with at Rochdale indoor meeting this weekend .
 
I know they are not Lazy Bee`s but if they fly anything like the Free flight Flea they should be a easy to fly



kevin wild15/03/2012 18:13:44
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133 forum posts
94 photos

Hi

all's well that ends well. she's been flying at the indoor club for a while now and is great fun

another member at our indoor club has just uploaded a video of his heli. if you look in the backgroun you can see it flitting around

 

 

thanks for your help guys

 

Edited By kevin wild on 15/03/2012 18:15:51

Edited By kevin wild on 15/03/2012 18:16:34

Stephen Jones15/03/2012 20:11:34
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Hi ,

Yes it seems to fly well there Kevin .

i take it the guy in the strips is you .

Daithi O Buitigh15/03/2012 22:38:49
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For future reference (a bit late now) - the plans for the Lazy Bee (and variants) - are available from the Hippocket gallery

Speedy Bee, Yard Bee, peanut lazy Bee and Big Lazy Bee

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