Public Lab Research note


Kite Construction: How bad can it get?

by mathew | June 04, 2016 00:29 | 117 views | 0 comments | #13165 | 117 views | 0 comments | #13165 04 Jun 00:29

Read more: publiclab.org/n/13165


What I want to do

I'm interested in workshopping Stormy Weathers' Horned Allison Sled Kite. (plans pdf), and I wanted to see how poor the construction could be and still have a flying kite.

My attempt and results

I started from a pre-cut pattern in Tyvek (this part was precise, I think I'd pre-cut the patterns in a workshop), and then taped down the McDonalds' straw spars recommended in the plan with 1" masking tape. I stuffed three straws into each other, end to end, and I lined them up by eye and taped them down. It was very messy and I didn't fold in any reference marks or anything:

P_20160513_202145_HDR.jpg

I similarly applied the 1/4" PP strapping tape (brand: Tesa 4288) for the bridle attachments entirely by eye. They are slightly uneven.

Then I tied the bridle. Here I made sure the bridle point was in the exact middle.

In Flight

I flew this kite and it flew great. I haven't gotten a good in-flight photo yet. I was suitably impressed, and it flew better than the version I made very carefully with bamboo spars.

Questions and next steps

My goal is to use this kite as a wind speed meter and need to calibrate it. I need to get a better clinometer and spring scale setup. My current spring scale is 5000g, @Ecta64 is recommending 250g scale. I should really attach the clinometer to a tripod or other leveling system.

P_20160517_171046.jpg

I also need to replace the stretchy dacron line with a non-stretch line, as recommended for a kite anemometer (wind speed meter). I bought 3000' of 70lb kevlar line from Emmakites.

I want to see if I get the same high-wind spar failures that @Ecta64 is reporting.

I should try a version out of a plastic bag, not just my fancy type 10 Tyvek.


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