I chronographed two flemish bowstrings; one 12 the other 21 strands. The speed did not change. I also checked if brace height affected speed and a 6" and 8" brace had no impact on speed.

The extra string at the tips made it basically a 16 strand string, you need to reduce weight and drag at the tips to affect a change in speed

It seems any increase in speed of the thin string, through a reduction in aerodynamic drag presumably, is probably lost in string stretch. Which might reduce the amount the limbs are drawn slightly. Or reduce the amount of power they can transfer to the arrow. The elasticity of thinner strings, in conjunction with flemish twist, might reduce the shock at the tips for those running spectra or dyneema on vintage bows. But its hard to measure. Except that many people have shot tens of thousands of shots using FastFlight on bows with unreinforced tips without an issue. So, Im not sure why there are so many warnings of doom about doing this.

It depends a lot on the individual bow some do not respond to skinny and some do testing on one bow only tells you about that bow. I have had bows that had no change and others had a dramatic change. Darren

I bought an RER LX Longbow with a skinny string.. I didn't like the way it shot and I immediately changed to a 16 strand and it made all the difference

The skinny strings your referring to are not the same material your using. Speed is one thing but sound is another. The material is the differences…

In my experience I've found that a higher strand count creates a more stable string. A skinny string is too unstable and that's why you had variability in your accuracy when shooting with it. Can you please make a video on your wood arrow build from start to end?

I have always wanted to try one of your strings, but you don't have a website. How do we go about buying a string from you? BTW, I really liked your video.

How can I order a string from you?

How do I order strings Thanks

The strings that came with my toelke whistler are super skinny as you'd know, but I find them to shoot beautifully for me. I have tried other strings here in Australia (from a very well respected string maker) but they are louder than my skinny toelke strings. What makes a loud or a quiet string? Consistency in the string itself? Thanks.

A little thicker string is more comfortable for me. I guess speed difference comes only from different string material.

Your test equipment is working against you for you to draw any concrete conclusions. You have a slow bow, a short draw length, and you are shooting 11.25 grains per pound. If a bow is going to shoot faster due a lighter, skinnier string, the results are going to be minimized in your case due to your equipment. Why don't you use a faster bow, and 9 and 10 grains per pound arrow weight and then see what results you get. It is very difficult to get speed from a 68 inch American Longbow unless you have a 34 inch draw length, which you do not have, otherwise your wooden arrows would have weighed a lot more than 450 grains. Why don't you try a 62 inch Toelke Whip , which is a quick longbow, and test for speed at 9gpp, 10gpp, even 11gpp and you will see greater results. Better yet, use a Centaur Triple Carbon Elite, an A&H ACS longbow, or a Borders Archery Hawk Hunter GL? Those are the 3 fastest longbows made and if there is a significant gain with a skinny string it will show up there as opposed to short drawing a 68 inch bow which isn't fast to begin with, no matter what string is on it.