Blue Turkish bow (64# at 30")

Alessi Francesco · Post by **Alessi Francesco** » Sun Oct 05, 2014 10:18 am

This one is 64-65# at 30", 115 cm long, mass 299 grams; braced at 6 3/4"
256 fps with a 255 grain arrow
238 fps with 293 grain
225 fps with 340 grain
220 fps with 367 grain
194 fps with 494 grain
168 fps with 710 grain

ravenbows · Post by **ravenbows** » Sun Oct 05, 2014 12:16 pm

This is a beautiful bow. Congratulations.

Kyudohund · Post by **Kyudohund** » Mon Oct 06, 2014 10:57 am

Peter

alexxxxandras · Post by **alexxxxandras** » Mon Oct 06, 2014 5:05 pm

homemade?

fusizoli · Post by **fusizoli** » Mon Oct 06, 2014 5:44 pm

He just borowed it from the museum for testing :D

bobbyp · Post by **bobbyp** » Mon Oct 06, 2014 8:05 pm

Well it should be displayed in a museum.

Seriously... How many working hours does it take for you Francesco to bring the bow to this finished stage?
I can imagine you must have some kind of diary for each bow that you make.

Bede · Post by **Bede** » Thu Oct 09, 2014 11:47 am

Alessi,
The workmanship is beautiful and is the design of the decoration excellent.

francodipisa · Post by **francodipisa** » Mon May 09, 2016 5:10 pm

Dear Francesco, please:
as for the data of arrow speed vs. arrow weight that you provide, are these referred to a 30'' draw length, or other else?

From a plot of 1/(V*V) vs arrow weight, I find that your bow has a virtual mass of 106.5 grains (+- 12.6 grains). The overall kinetic energy of the global system (arrow mass + virtual mass) at the draw length where you have measured the speed data is found to be 68.9 J (+-1.6 J). With the same draw length, the maximum theoretical speed of the nocking point (i.e., its speed in a dry shoot) is 464 +- 20 fps.
Knowing the draw length in question, it is possible to determine also the hysteresis losses. E.g., should this length be 30'', then the hystheresis amounts to -17.5 J (+- 1.6 J), since the total work required to draw the bow up to 30'' is 86.5 J.

The bow is a wonderful piece of work!

pcoutin · Post by **pcoutin** » Tue May 10, 2016 7:29 am

Looks so nice! Excellent energy storage! (I usually see the overall energy being the same as a straight line in f-d curves?..)