Tips on a lighter weight bow...

[Shredd]

Any tips on higher performance in a lighter weight bow??  I made a 30# bow, 62" when strung and I am getting 175fps @ 10gpp...  I was thinking of taking an inch or two off the limbs or extending the power lams an inch or two since the people shooting these bows are gonna have a shorter draw... Or maybe go to a narrower limb... I would like to reach 180 fps or more if possible... 

[Roy from Pa]

That's easy Shreddy..

Open up the back of the chronograph and there is an "FPS" adjustment pot in there that has numbers from 0 to 10.

The higher ya adjust that pot the higher read out ya get..

Put her on 8 or 9, that will make ya happy:)

 

[Crooked Stic]

I have heard that a same design bow shooting the same gpp.   30 -300 50 - 500 should be equal in performance. If that is true then you need to begin tweaking.

[Forwardhandle]

If it was me I would start narrowing I seem to get more FPS bang for the buck doing that then shorter that's a interesting thought on adjusting the P/L I'm doing that on my current bow but have no results yet, keep us posted !

[Shredd]

Roy... I already have it on 11...   

Stic... I always heard lesser draw weight, lesser speed @ 10 gpp...

FH...  Good point...  Common sense tells me to scale things down...

  I may have to wwork on a whole  new design for a light weight bow...

[Crooked Stic]

Got to keep your glass to wood ratio the same. to equal the speeds. Not something I would do on a regular bases.

[TradBowyer]

I totally agree with stic....the glass to wood ratio is important hence why lower poundage bows aren't as efficient. Same goes for higher poundage bows. When I was designing I picked a certain bow length and #50@28 then built my entire design around those parameters. That is where my bows perform the best. If there is any limb reflex at all then shortening the limbs could actually take it in the negative direction because now you are messing with your reflex ratio

[Crooked Stic]

Try to build s form with a optimal length in mind
. most times you can go one inch shorter or longer and not loose too much.

[Shredd]

Good points Guys...  I did make that bow with .030" glass back and .035" belly...  Where my 38# to 50# bows are .040/.040...

   Things might change when I am in the process of designing this lightweight bow... But... My plan is to make a bow with a 58" string and put a little tighter radius in the reflex of the working limb area, narrow up the limbs to about 1 1/4" at the base and an 18" riser...  The bow will be meant to be drawn at 24" to 27" with women and youth in mind... 

    Maybe down the line use the same design and build a heavier bow for guys with a short draw...  I am concerned with a heavier model and thicker limbs, the tighter radius may be too much stress...