Holy DFC Batman...

[Mad Max]

http://www.manchuarchery.org/bows

[Shredd]

No disrespect to you Mark...  You probably know that...  Honesty got the best of me...   I wish people would look at DFC's like they look at bows... If you did you would say, God...  That is a great looking bow but has one awful hinge to it...  What good is a hinge to a bow is the same as what good is a DFC if inaccurate...

  My statement was not ignorant... It was pure, honest and true...  Hope Y'all realize that...

[Mad Max]

2 Hinges about 12" long

Did you READ any of the Info. on the bow?

Does this bow DFC really need less than a half pound measurement?

[Mad Max]

This one is for Roy
I guess it's OK for 17th/19th Century

[Shredd]

2 Hinges about 12" long

Did you READ any of the Info. on the bow?

Does this bow DFC really need less than a half pound measurement?

   Got it... 

   Yes... Saw this a while back and I think we discussed this...  Impressive...

    It all depends if you want to look at a curve or see what the bow is really doing through the numbers... I usually look at the numbers more than the curve and in this example there are no true numbers to look at...

[Shredd]

Just want to add that I have seen two curves done by two different people and both curves look very different...  So...  Pick which one you want to look at and how much you learn from the curve that you choose...

[Longcruise]

That DFC is visually a poor example.  It would be more representative if the grid was laid out better.   

[Mad Max]

Maybe they shrank it to fit the article.

I like the numbers   

[Roy from Pa]

 

[Mad Max]

Why is the DFC line not going threw the squares 

[onetone]

Interesting article Max. Some useful info there for them that build RCs. Hard to imagine such craft developed before there were DFC graphics.

[Roy from Pa]

How would different brace heights affect a DFC?

It has to alter it somewhat.

Or is there a standard brace height for which to start with?

And Rich, I was only messing with ya to fire ya up:)

[Mad Max]

Interesting article Max. Some useful info there for them that build RCs. Hard to imagine such craft developed before there were DFC graphics.

What does the FPS on the arrow work out to be with a 820 grain arrow?
82#@32"--191FPS with 1230 grain arrow--3 under release

[mmattockx]

Why is the DFC line not going threw the squares 

If the curve is drawn by a spreadsheet using a curve fitting function it won't hit all of the data points.

What does the FPS on the arrow work out to be with a 820 grain arrow?
82#@32"--191FPS with 1230 grain arrow--3 under release

If you assume no loss of efficiency with the lighter arrow then speed with the 820gr arrow would be 234fps. If you assume a 10% loss of efficiency then the speed would be 221fps.


Mark

[Shredd]

Matt...  I feel your numbers are close...  If you take into account that those look like very heavy limbs I think you may be disappointed with the arrow speed of a lighter arrow especially at 28" draw...

   Roy...  First off you will never, never find the answer to your questions with a DFC such as this...  Now if you had an accurate DFC you could find the answer to your questions...  When you look at both curves with one being a lower brace height than the other you will not see a difference in curves....  If you were to overlap those curves you may see a subtle difference...  When you look at the numbers you will definitely see a difference...The one with the lower brace height will have slightly higher numbers at the bottom of the curve and and lower numbers at the top of the curve...

  There is no standard brace height... Just use the brace at what you choose to shoot your bow...

   Yep...  I was fired up a little...      But I was looking at your statement as more or less ignorant of what a dfc is all about...   

   I will say this about DFC's...  People often say that there is more stored energy underneath the belly of that curve...  If this was true a hill style bow with a relatively flat dfc would have no energy at all... I believe there should be a better way of defining it... If you have a hill style and a high performance recurve and they both weigh 50# they have the same potential...  It's how they deliver that potential...  Like a 500 hp deisel against a 500 hp gas race engine...  One is gonna get down the track a lot quicker and one will pull better...  So I don't think the limbs are storing more energy... I think it's how the limbs deliver the energy stored... It's like two pitchers of equal build and strength and one throws a 90mph fast ball and the other only 85 mph....  And like I have said before...  I have seen a better looking dfc that shoots a slower arrow of the same bow design... There are many other factors involved than just a dfc...

[Roy from Pa]

As long as I fired ya up, mission accomplished:)

 

[Shredd]

     Geez, Thanks...   

[Mad Max]

This is a quote (back fire  ) from Shreddy


"It seems to me that you can show 100 people a beautiful flower garden and one out that 100 will dig their hands deep down in the soil and say, "See, this is shit and it is everywhere.!!"

[Roy from Pa]

Ah come on now, are we talken bout the same Shreddy?

 

[mmattockx]

If you take into account that those look like very heavy limbs I think you may be disappointed with the arrow speed of a lighter arrow especially at 28" draw...

I agree. Those limbs do look very heavy so their max dryfire arrow weight is probably surprisingly high. That 32" draw is a huge help in getting better performance, I am sure a 28" draw would really gut the numbers.


Mark