Re: [RCSE] just wondering

[Les and Gypsy Stockley]

At a club F3B contest a few months ago in 
pretty windy conditions, I had my Scar at altitude, before I could do anything 
about it the Scar went nose first vertical and then did a tail slide, I thought 
maybe I had been hit with interference but talking to other pilots in the slot, 
found that one of them in the same area had his model do an uncommanded roll 
before he was able to stop it.
Very interesting I think, 
Les.
>Has anyone ever hit a 
thermal/updraft so violent that it flipped the plane>inverted??  A 
big plane, like 3.4 m moldie?

[RCSE] just wondering

[Bill Johns]

Has anyone ever hit a thermal/updraft so violent that it flipped the plane 
inverted??  A big plane, like 3.4 m moldie?

Just curious.

Bill

--
I asked Mom if I was a gifted child ... she said they certainly wouldn't 
have paid for me.

Bill Johns
Pullman, WA

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Synopsis:Re: [RCSE] Just wondering?

[Raineswn]

  Thanks for the input.
  Seems there would be negligable benefits to using such a system in a model 
airframe. (Minimal weight reduction, minimal increase in overall structual 
strength)
   Negatives abound so far:  Decreased control response, complexity, 
decreased battery cooling, potential increase in weight.
   So I'll shelve this one and wait on the next wild idea.
   Bill in Nashville
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Re: [RCSE] Just wondering?

[Martin Brungard]

Tony Rodgers wrote:

"Spreading the weight out along the wing is known as span loading and will 
have increasing impact on the loads experienced at the root, allowing for a 
lighter spar or stronger launches."

I have to take exception with Tony's assessment on this point. He suggests 
that moving the batteries into the wings could allow a lighter spar or 
stronger launches. The problem is that the aircraft mass is almost 
negligible in comparison to the launching loads. For most planes we fly, the 
aircraft mass is on the order of a few kilograms, while the launch line 
tension is on the order of tens of kilograms. The spar would still need to 
be virtually the same strength since the launch loading may only be a 
percent or so lower. That is well within the error range created by the 
unknowns of material variations, construction variations, and loading 
variations from gusts, etc. that we use in designing the spar system in the 
first place. Therefore, I suggest that the spar strength should not be 
affected by a relocation of the battery weight on a winch launched plane. 
The overall weight of the aircraft would also probably not change much.

Now if a plane is not going to be winch launched, then the stuff I mentioned 
above doesn't apply. Then, there may be a slight advantage to relocating the 
batteries into the wings. But that only will be an advantage if there is 
enough nose mass to otherwise properly balance the plane.

For everything else Tony mentions in his post, I agree!

Martin Brungard
Tallahassee, FL

"Meandering to a different drummer"


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