Traditional Archery Discussions on the Leatherwall


Frankenbow Draw Weight Estimate?

Messages posted to thread:
HighNTree 17-Nov-21
fdp 17-Nov-21
HighNTree 17-Nov-21
selstickbow 17-Nov-21
SB 17-Nov-21
Beauxhunterriick 17-Nov-21
Longcruise 17-Nov-21
gluetrap 17-Nov-21
HighNTree 17-Nov-21
charley 17-Nov-21
iowacedarshooter 17-Nov-21
HighNTree 17-Nov-21
George D. Stout 18-Nov-21
selstickbow 18-Nov-21
HighNTree 18-Nov-21
selstickbow 18-Nov-21
HighNTree 24-Nov-21
mahantango 25-Nov-21
George D. Stout 25-Nov-21
From: HighNTree
Date: 17-Nov-21

HighNTree's embedded Photo



I picked up an old PSE Silverhawk compound bow. The bow is 45 to 55 lbs. at 28 and 29 inch draw. I want to turn it into a Frankenbow. I need advice on what weight bow limbs would be needed to end up with a draw weight of 45 lbs. I read that the draw weight on the Frankenbow may be more or less than the draw weight marked on the limbs. Also, can you recommend an inexpensive set of 60 or 62 inch limbs?

From: fdp
Date: 17-Nov-21




How long is the riser between bolt holes?

From: HighNTree
Date: 17-Nov-21




I'm out hunting. I'll measure the distance between the limb bolts tonight.

From: selstickbow
Date: 17-Nov-21




those risers are nearly an exact clone of the 21" HOyt Rambo and Spectra. they are 21"-ish. I've had several of these PSE Silverhawks warfed to ILF.

From: SB
Date: 17-Nov-21




Limb pad angle is also going to be a factor as far as final draw weight.

From: Beauxhunterriick
Date: 17-Nov-21




Limbs come in shorts mediums longs extra long’s. Final length of the bow is determined by a combination of the riser and the limbs. With a 21 inch riser you’re going to want to go with shorts to get that desired overall length

From: Longcruise
Date: 17-Nov-21




Rick, that would pertain to an ILF conversion. For a frankenbow I think he would want to stick with 62" limbs.

Can't comment on that riser but my blac bear gives up about five pounds with 62" sage recurve limbs.

From: gluetrap
Date: 17-Nov-21




I would guese 50lb sage limbs would be close.

From: HighNTree
Date: 17-Nov-21




Selstickbow is right, the distance between the bolts is right around 21 inches. The limb angle looks about the same as that on the Black Bear compound. I'm looking to just buy some recurve limbs and bolt them onto the handle(not doing an ILF modification). IT's my understanding that a Warf is an ILF modification and a Frankenbow is just adding recurve limbs to the compound riser.

From: charley
Date: 17-Nov-21




50lb Sage is close, built several Frankenbow 21" on different risers, and they all come in around 4lbs light. If you are talking about an ILF conversion, that's alot of other variables to address.

From: iowacedarshooter
Date: 17-Nov-21

iowacedarshooter's embedded Photo



50# samick limbs on a pse riser came out to about 40#'s...a very good shooting bow. i just bolted the limbs to the riser.

From: HighNTree
Date: 17-Nov-21




Thanks everyone for the information. It looks like with the 21 inch riser on the Silver Hawk, I should get 55 lbs. limbs to end up with a draw weight of around 45 lbs. at 28 inches draw length.

From: George D. Stout
Date: 18-Nov-21




The Silverhawk has an indent at the base of the limb butt that you need to deal with by either slotting the limb to accommodate for it, or removing the indent itself. Otherwise you have to shorten the butt of the limb itself.

From: selstickbow
Date: 18-Nov-21




I HAVE 2 sets of bolt down HOYT TRACKER/REFLEX limbs if anyone can use them, they are similar to Doraado / GameMster limbs, but are extr shorts, mine are 50# and 55#, this on 19" Tracker risers. PM me if interested, it will cost you shipping.

From: HighNTree
Date: 18-Nov-21




Thanks Mr. Stout,

I'll likely file down the indent at the base of the limb butt. I'd be a little reluctant to change the limbs.

From: selstickbow
Date: 18-Nov-21




50#ers are spoken for, I still have the 55# limbs available. picture in the swap n trade thread.

From: HighNTree
Date: 24-Nov-21

HighNTree's embedded Photo



Here it is guys. I finished my Frankenbow last night. Thanks for all of your advice. I modified a set of 60 inch; 55 lbs.; Black Hunter recurve bow limbs to fit the PSE riser. I cut the limb butts down 2 inches on each limb and drilled new holes in the limbs for the mounting bolts. The bow ended up 61 ½ inches from string groove to string groove. So I guess this makes it a 62 inch bow. The bow weight came in at 49 pounds @ 28 inches draw. The bow feels very good in my hands and I was very pleasantly surprised by how well it shoots.

From: mahantango
Date: 25-Nov-21




That looks really good.

From: George D. Stout
Date: 25-Nov-21




Nicely done, that will make a sweet shooter as well.





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