Pushed back riser

[rmorris]

This weekend I shot a 58" longbow and with my 29.5" draw, and that bow defied all logic.The bow did not stack and there was no finger pinch that I get with short bows. The only thing I noticed is that that riser was pushed back on the bow nearly 2". I am assuming this is the equivalent of taking 2" off my draw?

Am I correct in this assumption? If I am, I am guessing the performance of this bow we be less than what I am use to.

My reason for this is that that the area under a force (draw weight) displacement (draw length) curve is the amount of energy, and a shorter draw equals less energy for the same  amount of draw weight.

Any thoughts?

[scottm]

Ive got a 58" shrew.And a 58" striker longbow.Im 6.4" tall with monkey arms as my wife calles them.My draw is 30-30.5".Neither of these bows stack.I can draw back to my ear with no notice of stacking or finger pinch of any sort.They are  two of the fastest bows i own.To answer your question i have no idea why?LOL!

[Swissbow]

Yes you are ( partially ) right. If the limbs and draw weight are the same then the bow with forward riser will have a slightly lower performance. But most of the bows with forward risers I have seen had a brace height that was somewhere between 7 - 8 inches. With a regular riser this would equal a brice height of 5 - 6 inches, which is rather low for a modern d/r bow. This means that the power stroke is a bit shorter, but not the full amount of two inches.
Not to forget the advantages of the forward riser which are improved stability and a less sensible bow to a not so clean release.
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Andy

[DavidV]

Contact Sixby of Eaglewing Archery. I remember him explaining the performance benefits of foreward riser bows.

[red hill]

Ralph, wouldn't the strength of the bow still be comparable to your regular set-up. Assuming of coarse both bows are the same poundage.

[psychmonky]

By "pushed back" do you mean toward you or away from you?

Either way the only thing that would cause stack is the angle of the string in relation to the limb at full draw. Once the string goes past 90 degrees, the bow starts to stack. A bow with more reflex will be able to accommodate a longer draw before stacking. At least that's how it was explained to me.

[johnny girardi]

Im thinking as I type so your draw lenth is your draw lenth. No mater what type bow.More deflex in riser is more forgiving and slower speed.The less deflex like one you shot will be faster but less forgiving even to string. Lenth of bow makes or longer bows store more energy and will make each type bow faster when set up right.Its a fine line when you can get a bow like that one to shoot good.When you do they shoot great.If the bowyer trys to tweek there bow design just a little they may not even be able to keep string on the bow.

[Jason Kendall]

Slower speed? Performance loss? Many of my customers and I will never agree with that assessment at all.

Sure, if you built a straight bow with a standard handle and the built the same bow with a reversed handle it would be slower. However, if you design the bow correctly you will not have any performance loss and you could even have one that's faster than most.

[rmorris]

Thanks guys for all the information! After looking at some of the manufactures web sites there is some very short longbows marketed to the long draw fellows, and these bows have remarkable performance associated with them. I may have to attempt a new design soon and give it a try.

Scott, by "push back" I was talking about the grip being further away from you.

Jason, I have heard nothing but praise about your "Kanati" longbow and although I have never seen one in person, they look to fit the profile I described in this thread.

Thanks again for obliging me in this topic.