tks windmaker
F-One, Chubanga, Mike's lab etc
hi windmakerwindmaker wrote: ↑Tue Oct 13, 2020 5:03 pmF-One, Chubanga, Mike's lab etc
BTW when I said the tips turned upwards they are not actually facing upwards, I meant the tips of the wing turning back up, so they are rather horizontal in relation to the rest of the wing.
Hi Eric,
Hi hypto,hyptocrypto wrote: ↑Wed Oct 14, 2020 4:41 amHi @PrfctChaos
I am designing a wing with a 965mm wingspan/216mm center chord/ 1340 sq-cm. The wing kinda scallops in creating a medium aspect near the center and high as you go further out (think cloud9 f-series kinda). I weigh about 90 kg's without any gear on, almost always use a wetsuit here on the Columbia river (fresh water) and in winter I use a drysuit. Looking to for a wing profile that's going to get my up on the wing-ding without too much trouble (maybe 8 - 10kmh) but also be glide effortlessly on the river swell here, top speed around 25-30 km/h. I am going to have to thicken the center chord to about 14% to get my fuselage connection to fit, but will taper back to 9-10 likely a few inches out.
I was going to use rg14 but want to make sure i am making a good choice for my specific needs.
I would be super appreciative if you could run the numbers for me sometime.
Thanks a million.
I suppose it depends how far the breach is into the air if it makes much difference?windmaker wrote: ↑Tue Oct 13, 2020 5:03 pmF-One, Chubanga, Mike's lab etc
BTW when I said the tips turned upwards they are not actually facing upwards, I meant the tips of the wing turning back up, so they are rather horizontal in relation to the rest of the wing.
Thanks so much for running this so quickly, made that post before bed last night and first thing in the morning you have already responded.PrfctChaos wrote: ↑Wed Oct 14, 2020 5:46 amHi hypto,
Looks like a good stats for a wing to me. The rg14 does pretty well in the calcs, but mh32 still makes another 6% or so improvement, so I would likely go for the mh32 option.
I have used your selected wingspan and area, that is used to calculate the "average" chord which is used for the calcs. Actual centre chord does not have a real influence.
Speed:
I think the low speed limit used in the calcs should not be interpreted very literally. It will be the limit during steady flight. But for starting other things like pumping or momentarily hanging off the wing / kite will play a bigger roll I think. Where a low drag wing can quickly accelerate up to speed and start flying. Just something to keep in mind.
Ran 2 sets of calcs, one for 10-30 km/hr and another for 12.5-30 km/hr.
I would ignore the 10-30 km/hr results, it is close to the limit of what that size wing can do and results in draggy fat wings.
Capture2.PNG
12.5-30 km/hr, starts to give better looking results, this is what I would use:
Capture.PNG
Table shows that the area of 1340 looks to be in the sweetspot for this combo. And what drag improvements can be expected with increased wingspan.
Capture3.PNG
Cheers
No worries mate.hyptocrypto wrote: ↑Wed Oct 14, 2020 3:51 pmThanks so much for running this so quickly, made that post before bed last night and first thing in the morning you have already responded.
I think 6% improvement is worth changing, good thing I checked I was going to machine the mold today. I notice you use the exact body weight in your model, do you think there is any merit in running the model with extra weight included (mast, fuse, board, wettie, leash etc?) I bet that adds quite a bit of extra lifting weight?
Thanks again.
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