New bow measurements

[DC]

Just in case anyone is interested I shot a 400 grain test arrow every inch of draw weight starting at 20 inches
20"-160fps
21-163
22-169
23-174
24-179
25-184
26-187
27-192
 Something I found interesting is how much scaping there was between steps. From 20 to 21 took lots of scrapes but 26 to 27 took one or two scrapes and a little exercising. I'm working on the last inch this morning. It's mostly finishing and then I'll check the draw weight and adjust it to 40#

[Del the cat]

Interesting... must have taken a lot of work
Del

[DC]

I leave the bow strung for tillering, that makes it a little quicker. I make a lot more trips to the tree than you seem to do. That one vid you did when you counted trips you got to about a dozen. I'd bet I make at least 50 trips to the tree.

[willie]

Just in case anyone is interested I shot a 400 grain test arrow every inch of draw weight starting at 20 inches
20"-160fps
21-163
22-169
23-174
24-179
25-184
26-187
27-192
 

did you make these shots as you tillered out the bow or after the bow was finished?
doing it both ways might make of some interesting comparisons.

[DC]

As I was tillering. I had a 400 grain arrow and as the 40# came to each inch I tested it. That's why some numbers are a bit skewed. I may have overshot or undershot the 40# a bit. I was a little surprised at the evenness of the speed gain. 5# per inch even though the bow must have been taking more set in the higher draw lengths. I don't know if this means anything at all but it almost looks predictable. This bow did reach 200fps but just and that involved a bit of tip lightening. I never checked but I think it was 197-198 at 28" before i started tweaking it.

[willie]

As I was tillering. I had a 400 grain arrow and as the 40# came to each inch I tested it.....  I don't know if this means anything at all...........

I think if you plotted the the speeds vs the draw lengths as you tiller, and then replotted again when you are finished, it could be a really useful tool to see how much your tillering, exercising and shooting in has affected the bow.

[DC]

If you plotted the F/D as you tillered wouldn't you get a straight line acroos the page?

[George Tsoukalas]

Wow! Excellent results. Jawge

[willie]

If you plotted the F/D as you tillered wouldn't you get a straight line across the page?

Don, I have made a mistake in the post above and edited it. What needs to be plotted is not the F/D  but the speeds vs the draw lengths.  Making three shots at each increment using a light weight arrow, a 10gpp arrow and a heavy arrow while collecting data might also get interesting.

[sleek]

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[DC]

If you plotted the F/D as you tillered wouldn't you get a straight line across the page?

Don, I have made a mistake in the post above and edited it. What needs to be plotted is not the F/D  but the speeds vs the draw lengths.  Making three shots at each increment using a light weight arrow, a 10gpp arrow and a heavy arrow while collecting data might also get interesting.

You just want me to wear out my bow, don't you
I just may do the 10gpp though. We'll see about the rest.

[DC]

Subscribed

I thought this might pique your interest

[Sagebrush]

DC thanks for all of your work compiling data points.  I think I learn a bit from every post.

[willie]

You just want me to wear out my bow, don't you

of course not, but I do think collecting data at less than full draw is useful and probably not all that much wear once the bow has been shot at the full draw a few times.

[Bubbabowyer]

Wow! Now those are impressive numbers!