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Main Boards => The Bowyer's Bench => Topic started by: Bvas on March 28, 2018, 01:06:05 PM

Title: C'mon DFC Gurus(and wannabees)
Post by: 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 :laughing: Be honest!
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Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Shredd 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???
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas 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.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Roy from Pa on March 28, 2018, 02:59:29 PM: Looks like a dumb wavy line to me...

:laughing: :nono: :jumper: :archer: :campfire: :laughing:
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas on March 28, 2018, 03:01:55 PM: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey:
No, that's a wavey line!!!! :biglaugh:
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Roy from Pa on March 28, 2018, 03:03:58 PM: No, that looks like a 54" S-quad..

:laughing: :laughing: :laughing:
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: gfugal on March 28, 2018, 03:17:44 PM: So I put it into my DFC calculator I made the other day.

(https://lh3.googleusercontent.com/OCbRG-ofyG-zuomQURUgs0aRxaT_tgYs2-Nwoq369f60TPLdCfqsUXD-UWUHpo2pQLKTgjFTnTImOJpeb5-Sa30YWO3ovO4hJy8JckS71_djGLc5qnCnSfMYYlmZmxXec5zIkuubDmRhSLgHsqFvj6PSQnbM0UtHv7k5hz9qel4l44b8mAthRHKAYdNW_6Ig-3s15F5m81BNYuZlX2NCn4MOmWUk2Jgvfi_9-Sl6uJS5yOzif1SbdIsOxDJoVmIPMfC7QZQ5s44a2uCtxKH7zwLs1qxXeevJMnV_EL0LR8aJ6Hwf0Zn8qAx-lo1ABiRp7PbGyotZ2hZqcY7ixHKYjaQYnrxvtUjDdXY97bOSw3v1G8fQTzPA2URWWoD982UL08xwjAU51IEovxzZ4jS21u4IabnZozxezoT472q-_0s9WdD0aY7CCYK4KZGVHHEKAV6H3Km7tRemw3rzEvVV3HbC8euyLLVvYFMu_Crr9GURBwSvApnjVMqzjB_eJf17ynfdoTczvjMGf1uVIY7y9m-lpHbZ6qObtSnoJwBGghSdbDvLiSTOC0By8KANzIvJi41KDe91Pt9a_AklyYyz7Xl732NjkwrUrP4KD9LH9mx-sYy4eEsGytiaZLgj5tKsJ4QHUjFCDe8Svq5KITu5aOUo4SALqptAFg=w755-h325-no)

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.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas 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.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: gfugal 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.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: monterey on March 28, 2018, 03:58:08 PM: My FDC curves always look like a a broken staircase.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: skeaterbait on March 28, 2018, 04:27:19 PM: Quote from: Bvas on March 28, 2018, 03:01:55 PM
:wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey: :wavey:
No, that's a wavey line!!!! :biglaugh:

BWAHAHAHAHAHAHAHAHA, now that's funny.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas 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
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Crooked Stic on March 30, 2018, 01:11:01 PM: Numbers look good . What does the bow look like at full draw?
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas on March 30, 2018, 01:23:58 PM: [ You are not allowed to view attachments ]
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Shredd 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...
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Crooked Stic on March 30, 2018, 04:49:04 PM: Speed is good. Full draw looks good to.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Forwardhandle on March 30, 2018, 08:04:53 PM: I don't know about the DFC but it's a sweet looking shorty :archer2:
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Roy from Pa on March 30, 2018, 08:32:39 PM: DFC is what them gwass boys do..

:laughing: :thumbsup: :archer2:
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: jess stuart 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!
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Shredd on March 31, 2018, 11:29:55 AM: Ok Bvas... I am curious... What are your plans after hearing all the Gurus?? :biglaugh: 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...
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas on March 31, 2018, 11:52:14 AM: This bow came in overweight. So I trapped and sanded glass to drop about 8#. I’d like to build another with same recipe other than stack adjustments to eliminate the need for trapping.

I like the form, and plan to keep as is. But I may play a little with power lam and tip wedge length. The original design stacked later in the draw, but lacked the speed I was wanting.

Overall, I’m very pleased with the performance, but like you said, I think there’s still a little room for improvement.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Shredd on March 31, 2018, 12:44:25 PM: I am just finding out that for my R/D bows that squeezing everything to the middle, working portion of the limb by adjusting your wedges seems to be the way to go for performance... Trick is not to get it hinging or too strong of a power lam... I noticed that your tips may be opening up a bit... Maybe stiffen them up with another 5- 10 thou. to help increase performance...

Here is something I also am just finding out about but I have not quite nailed it yet as far as to understanding what exactly to change... Measure your string tension at brace after you rough cut/rough sand your limbs... Then sand your limbs down a bit or to your desired width... If it goes down in tension the bow is going down in performance and that means you need to make changes in your recipe... If it goes up in tension, you have got a good recipe going on for performance....

Hope you don't mind my opinions and I am also throwing my thoughts out there for everyone else to get something from them...
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Bvas on March 31, 2018, 01:15:21 PM: Quote from: Shredd on March 31, 2018, 12:44:25 PM
Hope you don't mind my opinions and I am also throwing my thoughts out there for everyone else to get something from them...

Thanks Shredd
Opinions and thought are what I’m looking for. Hopefully we can all learn and improve.
Title: Re: C'mon DFC Gurus(and wannabees)
Post by: Shredd on March 31, 2018, 01:34:53 PM: Hell Yeah!!! :shaka:

Wish you the Best... Keep us posted...