Ashby interview-thoughts on carbons

[KSdan]

Chris- okay- I just re-read and re-figured. . . I am just making it worse ain't I???  Sorry. I see you are trying to figure how to go UP to a 100 gr adaptor on the 140 BH and 100 brass insert = 340.  

It still seems pretty doable though with a 145gr field point-which is pretty standard I think.

I quit. . .      :confused:

[Missouri CK]

Dan,

I agree that would keep me close to where I was at but it seems like most of the broadheads that are being recommended are at the high end of weight as well. The Grizzly is the prime example because the lower weight Grizzly are not said to have the same performance as the higher weight El Grande.  Even with Dr. Ashby's example of the STOS head the 165 grain is just slightly below the recommended MA.  My bet is the 145 grain version is below the 165 grain option.

Chris

[KSdan]

Same situation here. . .hmmmm.

[Molson]

Chris-  Unless I'm misunderstanding you, just glue your steel adapters into matching glue on field points. For example: 190 Griz on a 100 gr adapter = 290gr.  160gr glue on point with 125 gr adapter = 285gr.  Add a 5gr brass ring and your equal.

[Guru]

Chris, Like Molson said, with a combo of adapters and glue-on fp's...you can match just about any BH combo...

[fyrfyter43]

And for an even better selection of field points, you can always add lead shot or solder melted into the steel adapter. Want a 350 grain field point? Use a 125 grain steel adapter with 65 grains of bird shot melted in. Or maybe 50 grains of bird shot, with the other 15 grains made up with epoxy to hold the shot in. Glue on a 160 grain field point, and you've got 350 grains.

[Jeff Sample]

Thanks Dr. Ashby!

[Grizz 53]

I shoot beman mfx carbon shafts. I was tinkering with them one day trying to figure out how to add weight to the front of the shaft. I discovered that a 20 penny nail will fit perfectly in the shaft. Took bolt cutters and cut them into 1 inch pieces then took a file and worked them down until they were exactly 50 grains. mixed a little epoxy, coated the nail then rammed it in from the nock end all the way to the back of the insert. Worked like a charm.

[jeff / sc]

I just use 250 gr screw in field points.  My WW are 125 gr plus 125 gr steel adapter = 250 gr, my Stos are 160 gr plus 100 gr steel adapter = 260 gr(close enough for me).  The weight of the insert in the arrow shaft doesn't really matter since it is the same regardless of which point is used.

[KSdan]

One more question for anyone on me getting the weight accurate?  Is there any weakness/harm in using a standard aluminum insert instead of the brass?  I have a plan. . .

Thanks again Dr. Ashby and all who contributed. . . ever in KS, stop by.

Dan

[Dr. Ed Ashby]

Dan,

The aluminum inserts with a steel adaptor screwed in is FAR stronger than when used with a aluminum adaptor; but not as strong as a brass insert with a steel adaptor (assuming it's not one of the 'snapping 75 grain ones').

When I was testing the Internal Footings (extreme testing them, I must add), I encountered actual compression of aluminum inserts. These had 125 grain steel adaptors and, of course, the IF behind the insert. This shooting involved direct and angular impacts against 3/4" armor plate, from 20 yards; and was done to evaluate the effect of the IF's. The aluminum inserts began to bulge; bulging the shaft over the insert. Sometimes this occurred after one hit, but always showed up after several hits, soon splitting the shafts.

Is that significant? Don't know. Just know that I would prefer that it not happen. The same testing with hickory shafts: only the filed point were damaged. My goal is to get a carbon Extreme FOC shaft setup that is at least very, very close to the durability of the hardowwd shafts, on heavy and angular impacts.

It sounds like most have worked out how to match field point weight to their BH's. However, rest assured that, if heavier BH's do come on the market, someone, somewhere will come out with field points that can be weight-matched for use.

Ed
TGMM Family of the Bow