Launcher rests for carbon & compound fingers (SuperStar, etc)

[Jorge]

I'm having problems with fletching hitting the launcher in finger rests that use one (Superstar, my Franke, etc).
I started to think aboit it, and here are my conclusions:

Carbon arrows shot from a compound present much less bending than it's shown in alum/recurve high speed videos, so they do not clear the launcher upon release.
I think the launcher shall be moved inside (to the riser) and the tip, where it touches the arrow shall be pointing out (in the way the arrow is already moving due to finger's release).

This way, if there's fletching/launcher contact, the forces generated will be in the movement's direction and not against it, as it happens if the launcher tip is vertical or pointing inside.

Comments?

[Scrat]

If the carbon arrow is properly spined, it will have the same bending cycle as the properly spined aluminum. The amount of the bend should be about the same, but the flexing on a carbon arrow will diminish downrange at a faster rate because it is lighter and the carbon dampens vibrations faster than does aluminum.

If you're having fletch contact with your arrow, you probably need a weaker shaft because the arrow is starting its reverse bend before it clears the bow.


Not exactly a "traditional" subject.... :-D

[Jorge]

If you're having fletch contact with your arrow, you probably need a weaker shaft because the arrow is starting its reverse bend before it clears the bow.

Not exactly a "traditional" subject.... :-D


Well, the Admins have determined that finger's shooting posts shall be in this area... :-)

I've solved the problem by turning the vanes from the traditional 9, 2 and 5 o'clock positions to about 8, 1 and 4 o'clock positions.

The interesting part is that my arrows, in a bare shaft test are slightly underspined (shafts shoot to the right), but by the time the vanes arrive at the rest all side movement has subdued!

Fingers + compound + carbon is not the same as the high speed videos shows for recurve + alum. :-o

[Scrat]

"Traditional archery includes longbows, flatbows and recurves."

It doesn't specifically say it doesn't include compounds , so I'm not going to argue, but it doesn't sound right somehow... :-D Maybe that's why you're not getting replies to your threads?

Anyways,* what high-speed video have you seen? Have you seen one that shows the same bow shooting the same spined arrows in both aluminum and carbon? The same spine by definition would have the same amount of bend under the same stress, regardless of the material used.

"Carbon arrows shot from a compound present much less bending than it's shown in alum/recurve high speed videos"

Yes, because the carbon shot from the compound is probably a lot stiffer than the aluminum shot from the recurve. Not a valid comparison.

[Jorge]

Scrat

Posted by Tejas Raz:
" Fingers Forum
Post it up on the Traditional Forum BugZ.
We'll take on Compound shooters that shoot fingers too.
Much easier to keep up with there."

The videos I've seen do not specify what type of arrow. I suppose they are alum or alum carb.

"..because the carbon shot from the compound is probably a lot stiffer than the aluminum shot from the recurve. Not a valid comparison."

From the Easton shaft selector program, bow weight 45#, arrow lengh 29", 100g point, fingers:

Compound - spine .420 to .440
Recurve - spine .460 to .505

So, not a lot siffer...

[Scrat]

Did the video specify that both the compound with carbons and the recurve with aluminums were both the same draw weight and draw length and a similar-spined arrow? These need to be all the same for you to make a valid comparison between the two regarding the amplitude of the bending cycle.

If the compound in the video that you saw was shot at 30" draw and 60# using, say, a 340 spine carbon arrow, and the recurve shot at 28" draw at 42# using a 600 spine aluminum arrow, that would hardly be a basis for concluding that "Carbon arrows shot from a compound present much less bending than it's shown in alum/recurve high speed videos, so they do not clear the launcher upon release."

I've expressed my point. Please feel free to continue to disagree.


And no matter what the moderators say, your Protec with scope and v-bars is not a "traditional" bow... :-D :-D :-D

[Tejas Raz]

Scrat, we decided on adding the finger shooters here in the Traditional area mostly because we, the traditional shooters, ALL shoot fingers. Plus, there are many of us who also shoot compound. We could have gone into the General section, but since the activity level is lower over here, it would be a good place and would be easier to look up for those needing information. There's the rational and since ASN is ALL about the furtherment of our sport, the easier it is for folks to find the info they need, the better. So, for the lack of a better place,

the Traditional area now includes, selfbow, longbow, recurve, AND fingers. :-)

On topic:
I'd be betting that the aluminum/recurve would be way off the dynamics of carbon too. But mostly because of the difference in material and not because of the recurve/compound differences which I'd bet are slim depending on the recurve's cutout area. Carbon settles down very quickly compared to aluminum. Gold Tip used to have some very good video on their web site showing the differences, but I don't think it's there anymore.