String Tension

I have been working on that a lot in the past year...  I make a 62" string which I call a Hybrid...  I am getting a better average lately of about 177 to 183fps...  I just shot a bow Sunday and got 190fps with a 43# bow  -- 410 gr  --  at 29" draw...

Max...  What kind of speeds are you getting and what kind of bow do you make.???

[Mad Max]

The last one I made was 191 with 10gpp
Static recurve, 8" of reflex

I will finish my new one this month.
hoping for more speed.

Damn...   Are you using carbon??? How many lbs. and what string length.???  How long you been building bows???

[die_dunkelheit]

Originally posted by Mad Max:
The last one I made was 193 with 10gpp
Static recurve, 8" of reflex

I will finish my new one this month.
hoping for more speed.

That sounds like the magic of a static recurve...
How long are the recurves and how far recurved are they?

[Mad Max]

4" to the bridge and 7" of static
 

[die_dunkelheit]

Originally posted by Shredd:
Hey Ghost... I am interested in you cast/string angle theory...  If you get some time pm me or post it on the forum... Would love to see it... Its been something I been thinking about recently...

Sorry, I meant to reply to this in my last post..
Yeah give me a day or two to get it written up more clearly so it will make sense.
The short version is it's how string angle affects us in one way when we draw and how it affects the arrow differently in cast.

[die_dunkelheit]

Originally posted by Mad Max:
4" to the bridge and 7" of static
     

That is a fine looking static recurve sir. I'm guessing you laminate the siyah in a jig and then smooth out the tapper before it goes into the limb? At what point in the draw does the string lift off of the bridge?

[Crooked Stic]

At what point does reflex turn into recurve?  

[Mad Max]

die_dunkelheit  Yes that is how I did it.
first one's were 22/23" now 18/20" off the bridge.
That is a 64" bow, number 4 T/D

number 5 I am going to a 62" one piece, back to my original tip angle and going for 30/32" draw and trying to get more bend at the levers.

Crooked stic ???????

 

[Crooked Stic]

Everyone is talking string tension. And has agreed that more reflex gives more tension. So at what point is reflex turn into recurve. So now lower Brace = more tension = better performance or lower brace = more power stroke =better performance or hand in hand ?

[Roy from Pa]

I'd say hand in hand. I just build them my way and have never even given string tension a thought!

[Mad Max]

yea, what Roy said

[Crooked Stic]

What I was thinking to. Keep it simple!

[die_dunkelheit]

Originally posted by Crooked Stic:
Everyone is talking string tension. And has agreed that more reflex gives more tension. So at what point is reflex turn into recurve. So now lower Brace = more tension = better performance or lower brace = more power stroke =better performance or hand in hand ?

Originally posted by Crooked Stic:
What I was thinking to. Keep it simple!

The point about lower brace was only that it demonstrated that string angle has a greater effect than limb load. The goal should be to be more educated about what makes a bow efficient so that we can achieve above average cast speeds with a given draw weight.

A bow with so much reflex that the tips cross but is whip-ended so the string angle is 90 degrees would cast slower than you could throw the arrow and would also stack like crazy. A bow with no reflex but with a 1 degree string angle would be very fast and would not stack at all. The result? A bow with lots of reflex and tight string angle throughout the draw (recurves) would give no stack and very, very, fast cast.

Reflex affects string angle, recurve affects string angle, recurve is reflex focused at the tips, reflex is recurve spread through the rest of the bow. I don't care how you do it, an understanding of what is going on is my goal here.

[Mad Max]

die_dunkelheit

"more educated about what makes a bow efficient so that we can achieve above average cast speeds with a given draw weight".

two bows off the same form, one 30# the other 50#
will they cast the same speed with 10gpp ?

[Roy from Pa]

Maxi boy, mine does. Cause I adjust the 30 pounders string tension higher than the 50 pounders string tension. Nutten but 10 rings.
LOL.. Come on guys, this thread is getting repitious beyond reality.

[jsweka]

Where's our engineer canopyboy when we need him?    

[Mad Max]

Be quite Roy
exercise your shoulder and order a dust collector.


   :p

[Roy from Pa]

No may Maxi Boy. After this thread, I may just quit making bows cause I've been doing it all wrong...  

But I need to know, if this tension theory is factual, and is there a calculated fractions factor draw curve I need to implement in there, if I switch between B-50 and FF string? I just love splitting hairs ya know...