silvertip arrows - good bareshaft but poor broadhead flight

[ScottinPA]

Got my new 'tip the end of Sept and have been setting it up off and on since.  Specs - 58" TD recurve 74#@27" FF with a TS+ string.  Arras - 28" CE Heritage 350s.  My similar Hummingbird (71#) like 50gr inserts & 175gr tips.  I got 150gr tips to bareshaft pretty good.  Broadheads are a different story.  Can't get 175, 150, or 125 to fly.  They all show weak.  Any ideas?

I need to video my form but the Hummingbird shoots well.

[Benny Nganabbarru]

So, you got a bare shaft behaving itself well, but when you put a broadhead on instead of a fieldpoint, it went crook. Do you mean that fully-fletched arrows with broadheads fly weak, or bare shafts with broadheads fly weak?

[ScottinPA]

Full fletched with broadheads fly weak.

[Benny Nganabbarru]

I'm baffled. Can you please describe exactly what you mean by them showing weak? Do you observe this in flight? Do they hit the target somewhere you don't intend them to? Do they stick into the target at a funny angle?

[Benny Nganabbarru]

What broadhead, and what target?

[Benny Nganabbarru]

Are your perfect bare shaft results with fieldpoints the result of observing them in flight, or of seeing how they line-up in the target? If it's the latter, I've been told this year that this can be misleading, and that it is their flight that should be observed, in which case you may still be too weak even with bare shafts, but they find a hole and straighten-up.

Just a thought...

[ScottinPA]

In reverse order:
Bareshaft & fletched fieldpoints impact at same point of target, not how they end up sticking out.  
Broadheads - Block 4x4
Fieldpoints - bag target & block
I try to get field tips and broadheads to impact the same point on the target regardless of how they look in flight or how they stick out of the target.
My definition of showing weak is wobbly flight and impact to the right of the intented target (right hand shooter).

[Benny Nganabbarru]

TTT for Scott...

I'm stumped.

[Danny Rowan]

Wobbly in flight is a nock point problem, raise or lower the nock. I am not good at carbon arrows but with wood you would need 90# spine with up to a 145 gr point anything over 145 add 5# in spine. An AD Trad Heavy with 100 gr insert would probably work perfect also,only carbon shaft I have experience with.

Danny

[ScottinPA]

Danny,  I was thinking that too.  They may be related in that the nock point is causing the arrow to hit the riser and throw arrow flight off somewhat consistently.  That would explain why I didn't see a dramatic change when I went to 125gr tips.
Next nice day I'm going to move farther back than 20yds and bareshaft to see if I can fine tune the groups.

[Missouri CK]

With out a doubt, listen to Danny Rowan. Might even be a combination of nock point and brace (new bow=new string=stretch)

[Gordon martiniuk]

I think Danny is right hat the same problem lowered nock point and all was well