rtfm
Well-Known Member
Hi,
My question relates to where along the chord of the front wing to attach the pivot.
Some background:
In the plans, the front spar is used to anchor the wing pivots (this is eminently sensible since this is the only solid place in the wing). From the plans, the front spar is situated 260mm from the LE (HM293) and 275mm from the LE (HM360). However, in both cases, the point through which the lift acts is at the 25% chord position, which is (for the 1.2m chord wing used on both the HM360 and the HM293) 300mm from the LE.
It's unclear from the literature or the plans of the HM360 and HM293 if the pivot point *needs* to be ahead of the 25% chord point, or if this is simply a function of the fact that this is the "usual" position of the front spar.
So, to finally get to the question:
I'd be interested to hear from experienced builders/flyers of the Flying Flea (or from any knowledgeable designers) if placing the pivot point of the front wing at 25% chord would be (1) Good (2) Bad (3) Make little difference
Regards,
Duncan
My question relates to where along the chord of the front wing to attach the pivot.
Some background:
In the plans, the front spar is used to anchor the wing pivots (this is eminently sensible since this is the only solid place in the wing). From the plans, the front spar is situated 260mm from the LE (HM293) and 275mm from the LE (HM360). However, in both cases, the point through which the lift acts is at the 25% chord position, which is (for the 1.2m chord wing used on both the HM360 and the HM293) 300mm from the LE.
It's unclear from the literature or the plans of the HM360 and HM293 if the pivot point *needs* to be ahead of the 25% chord point, or if this is simply a function of the fact that this is the "usual" position of the front spar.
So, to finally get to the question:
I'd be interested to hear from experienced builders/flyers of the Flying Flea (or from any knowledgeable designers) if placing the pivot point of the front wing at 25% chord would be (1) Good (2) Bad (3) Make little difference
Regards,
Duncan