performance question, forgive me I am not a physics guy.

[fireball31]

All else being equal what bow is going to be more efficient or faster. I 62 inch bow with a 17in riser or a 15in riser. Both would be drawn to 29inches.

*edited to explain say that same bow model same limb design*

Idk which will be faster, but if both bows are the same length, the one with the 2" shorter riser should feel smoother because the limbs are longer.

Bisch

[forestdweller]

To my knowledge both bow's should perform the same since the limbs do all of the flexing.

The longer bow will be more stable though.

[ChuckC]

It seems the shorter how's limbs would be slightly more flexed and you would end up with a slightly different string angle.  Then, it depends on the bow and it's design.

[McDave]

I've been told that the long riser, short limbs will shoot a light arrow faster, while the short riser, long limbs, will shoot a heavier arrow faster.  I haven't tried to test this.  It sort of makes sense to me though.  A light arrow should get up to speed with a short flip, whereas a heavier arrow, with more inertia, would require a longer power stroke to get up to speed.  This might be the reason why Olympic bows have such long risers, and shoot the lightest arrows they can make work.

Guys, the way I read it, both bows are 62". One with a 15" riser and one with a 17" riser. The 15" riser would have 2" longer limbs than the 17" riser.

Looks like that is the way McDave read it too, looking at his answer.

Bisch

[Orion]

Any bow that shoots a light arrow fast, will shoot a heavier arrow faster as well.

A bow really isn't the same if you change the riser length, but the longer riser will be a tad faster, with both lighter and heavier arrows, because the limbs are flexed a bit more compared to a shorter riser/longer limbs.  

Now we're not talking big differences here, maybe 1-3 FPS. It's measurable, but not noticeable to most shooters.

[fireball31]

Bisch that is the way the question is intended. Thanks for the answers guys.

[kennym]

Originally posted by Orion:
Any bow that shoots a light arrow fast, will shoot a heavier arrow faster as well.

A bow really isn't the same if you change the riser length, but the longer riser will be a tad faster, with both lighter and heavier arrows, because the limbs are flexed a bit more compared to a shorter riser/longer limbs.  

Now we're not talking big differences here, maybe 1-3 FPS. It's measurable, but not noticeable to most shooters.

X2

And the longer limbs "may" shoot better for you at 29" DL....