FOC Question

[Mudd foot]

#3526

Everyone,

I have a question about FOC and the use of brass inserts. If the size of the broadhead remains constant, yet the weight increases, is there a reason that a lighter weight broadhead would be used in combination with an insert, as opposed to using just the heavier broadhead? Is it a matter of having a strong anchor for the base of broadhead, or is it a matter of vented broadheads having less wind planing vs their solid counterparts?

If someone could point out the specific part of Dr. Ashby’s work that addresses this item, it will be greatly appreciated.

Thanks in advance for any and all assistance!

Mudd Foot

[Bounty Hunter]

#21031

Heavier broadheads are my first choice over inserts, but that is the problem in some cases, there isn’t a great selection of heavy screw-in broadheads. So basically you have two choices to get your front end weight up.

1. Add a weighted insert and one of the many lighter screw in broadheads on the market.

2. Get get glue on broadheads and add weighted screw-in adaptors.

At the speeds of most traditional bows you won’t get much, if any air planing. So that isn’t the reasoning. I don’t remember a specific area in Dr. Ashby’s work that addresses what you are asking. Maybe he will come along shortly and you can get the answers straight from him.

[David Petersen]

#21068

I am struggling to understand your precise question … I’m slow that way sometimes. But to come at it a different way, the FOC game is about getting as much arrow weight up front as possible on a light shaft and still maintain perfect arrow flight. From a purely FOC POV it shouldn’t matter whether the point weight is in the head or the insert or the adapter or a combo of all three. Generally speaking, the heavier heads are the stronger heads, so my personal theory is go with what I judge to be the all-around “best” broadhead as first priority, so that if I have to drop some weight it will be in the insert or adapter. Using steel adapters and brass inserts it doesn’t much matter, so far as I know, where you save the weight. In fact I’ve never had to deal with that. I would never go to aluminum inserts or adapters as they performed poorly in the Ashby study. Like Mudd, I presume and hope Ed comes along to correct anything we’ve mislead you on here and to further educate us all. Dave

[Jason Wesbrock]

#22070

Mudd,

I think the main reason for that type of combination is that the person already has a particular broadhead they like and does not want to switch. For example, I’ve been shooting 125-grain Ace Standards for several years and have a decent supply on hand. If for some odd reason I needed to add front weight to get an arrow to tune properly, I would use heavier insert. They’re much cheaper than new broadheads.

[Mudd foot]

#22660

Thanks for the responses gents!

Dave, are you able to pinpoint where in Dr. Ashby’s research the aluminum insert data is located?

Thanks!

[Troy Breeding]

#22882

Mudd foot,

Look over at the other campfire forum under the thread about screw-in Tuffhead broadheads and I think you will be able to understand what Ed is talking about. He give a pretty good statement on this subject.

Troy

[Mudd foot]

#23419

Thanks for the reference Troy. Found Dr. Ashby’s comments regarding the structural integrity of aluminum vs steel. This completely answered my question. Sorry for being redundant: there is alot of info to surf here!

Thanks again all for your patience!

[Author]

Posts