Author Topic: C'mon DFC Gurus(and wannabees) (Read 2717 times)

Bvas · « **on:** March 28, 2018, 01:06:05 PM »

This is the DFC I worked up on my 54" S-quad I posted a couple weeks back.
So....how do you think it STACKS up

Be honest!

Shredd · « **Reply #1 on:** March 28, 2018, 02:41:32 PM »

Curve looks Pretty Good it looks like it is starting to stack just past the 28" mark... Where are the numbers??? I go a lot by the numbers... Things can be so subtle that charts can look very similar... With my bows I am finding that you want about a 10% or more gain in the beginning and low 5's or under 5% at the end of the draw for good performance... The chart has a nice smooth flowing line to it... How did you measure the weight at each inch accurately?? Do you have a number at 9"??? Between 9 and 10" is gonna be your biggest gain unless you go to a lower brace height...
Just looked up the pic of your bow... Looks Great... Did you run a chrony on it???

Bvas · « **Reply #2 on:** March 28, 2018, 02:58:08 PM »

10"-5.75#
11 - 9.85
12 - 13.38
13 - 16.48
14 - 19.12
15 - 21.77
16 - 24.07
17 - 26.30
18 - 28.44
19 - 30.56
20 - 32.65
21 - 34.86
22 - 37.09
23 - 39.42
24 - 41.89
25 - 44.45
26 - 47.23
27 - 50.03
28 - 53.23
29 - 56.60
30 - 60.26

Weights were pulled on tillering tree. Pulled all lengths twice than averaged the two.(none differed more than .1#)
Haven't had a chance to chrony yet. Free time and weather haven't aligned yet.

Roy from Pa · « **Reply #3 on:** March 28, 2018, 02:59:29 PM »

Looks like a dumb wavy line to me...

Bvas · « **Reply #4 on:** March 28, 2018, 03:01:55 PM »

No, that's a wavey line!!!!

Roy from Pa · « **Reply #5 on:** March 28, 2018, 03:03:58 PM »

No, that looks like a 54" S-quad..

gfugal · « **Reply #6 on:** March 28, 2018, 03:17:44 PM »

So I put it into my DFC calculator I made the other day.

I'm not sure what your brace height was, but I just assumed 9" from your picture. I also didn't know your arrow weight so I just put in a random weight around 9gpp. Do you know what velocities you are getting with your arrows? I'm guestimating that you'll probably get over 180 fps if you reach 70% efficiency (which I'm not sure how FG bows average in efficiency). Your SE/DW ratio is about 90% which isn't bad, but it shows that it probably has a little bit of stack.

Bvas · « **Reply #7 on:** March 28, 2018, 03:23:28 PM »

Greg, the actual weights and lengths are a couple posts down from the chart.
The brace height was set about 7.5".

Havent had a chance to chrny yet.

gfugal · « **Reply #8 on:** March 28, 2018, 03:29:22 PM »

Ok so I re-entered your values. Most every value stayed close to the same although they did get slightly better. A SE/DW ratio of 92% and hypothetical velocity of 180 fps at 70% efficiency (which may be a low efficiency I'm not sure). When you get the chance Chrono it and get back to us. I would like to know what efficiencies people are actually getting.

monterey · « **Reply #9 on:** March 28, 2018, 03:58:08 PM »

My FDC curves always look like a a broken staircase.

skeaterbait · « **Reply #10 on:** March 28, 2018, 04:27:19 PM »

Quote from: Bvas on March 28, 2018, 03:01:55 PM

No, that's a wavey line!!!!

BWAHAHAHAHAHAHAHAHA, now that's funny.

Bvas · « **Reply #11 on:** March 30, 2018, 12:40:30 PM »

Rain finally stopped long enough to get the chrony out.
Tested @ 28”-53.23#
Braced @ -7.375”

Bareshaft arrow 479gr total weight(175gr tip)
Mechanical release 192.5fps

Bareshaft arrow 554gr total weight (250gr tip)
Finger release-172 fps
Mechanical release- 178.5 fps

Crooked Stic · « **Reply #12 on:** March 30, 2018, 01:11:01 PM »

Numbers look good . What does the bow look like at full draw?

Bvas · « **Reply #13 on:** March 30, 2018, 01:23:58 PM »

Shredd · « **Reply #14 on:** March 30, 2018, 04:16:23 PM »

That is kinda what I was guessing, 177 to 181fps... Not bad... I think the bow is sweet... I am not familiar with shorter bows it may be difficult to improve on performance... One thing I think that can be done to get more performance out of bow that long is to move the riser forward...

Crooked Stic · « **Reply #15 on:** March 30, 2018, 04:49:04 PM »

Speed is good. Full draw looks good to.

Forwardhandle · « **Reply #16 on:** March 30, 2018, 08:04:53 PM »

I don't know about the DFC but it's a sweet looking shorty

Roy from Pa · « **Reply #17 on:** March 30, 2018, 08:32:39 PM »

DFC is what them gwass boys do..

jess stuart · « **Reply #18 on:** March 31, 2018, 10:01:10 AM »

I like the profile at full draw, bends nice with slightly stiffer tips, keeping a good string angle. I think you nailed it congrats!

Shredd · « **Reply #19 on:** March 31, 2018, 11:29:55 AM »

Ok Bvas... I am curious... What are your plans after hearing all the Gurus??

Are you gonna make some changes?? I agree with Jess... I think you are damn close to nailing it... But I feel there is always room for tweaking...

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Author Topic: C'mon DFC Gurus(and wannabees) (Read 2717 times)

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