Posts by hau

  • Roller spearguns


    hope this helps

  • Roller spearguns

    Quote from dsculley

    And the chrono is conclusive. If you have two projectiles of the same mass and form (spears), the one that has the fastest muzzle velocity will have the most energy. This equals flatter trajectory and more penetration. Penetration comes from momentum, or the remaining energy when it reaches the target. If you want to prove it to yourself, go to any ballistics program, select a bullet, then run the program with two different muzzle velocities using the same projectile. The one with the higher muzzle velocity will shoot flatter and retain more energy downrange. Whether you are shooting bullets, arrows or spears the science that predicts performance is called ballistics and is a function of the mass and form of the projectile and the amount of energy that is used to launch the projectile.


    No matter which method you use to test the theory, (chronograph, Go-Pro, or penetration test) you need to make sure the butt end of the guns are supported in a manner (such as against the pool wall, perhaps with a foam cushion between the gun and wall) so that differences in recoil due to differences in the mass of the guns will not affect the results.


    Dennis


    It is THIS ^^^ simple. I've been saying THIS ^^^ for YEARS.
    No magic, no opinions, no bs
    FINALLY someone else got it right :fanwave:
    Thanks dsculley for making this solution so clear that even a seal :laughing: could understand.

  • Roller spearguns

    Quote from seal

    Sure Im working on gettin a chronograph.
    BUT the easyest and simplest way to compare the speed is the PENETRATION.Anybody could do this.Speed=energy=penetration.This is what we need and its done many times.The penetration of normal guns always looks poorer compared with even smaller rollers.The complicity of rollers comes from bad builds or is a myth invented by the haters.I proper made roller is easy and relieble as any other gun.
    I dont have any fake reason to defend the roller idea.I am making classic guns with the same success.But if a friend asks me for advise,I will make him a roller;);););)


    1. "Speed=energy(weight) =penetration".----true
    2. "This is what we need and its done many times.The penetration of normal guns always looks poorer compared with even smaller rollers".-----opinion (unproven)
    3. "The complicity of rollers comes from bad builds or is a myth invented by the haters".-----opinion (unproven)
    4. "I proper made roller is easy and relieble as any other gun".----false (if proper made roller guns are easy, why do they:
    a. cost more? ----(proven)
    b. is wheels/axels/bottom attachment points/dedicated muzzles "easy and relieble" as a conventional gun?----false
    5. "I dont have any fake reason to defend the roller idea.I am making classic guns with the same success.But if a friend asks me for advise,I will make him a roller"----opinion


    Please to keep in mind that what we are discussing here is a comparison of a simple roller gun to conventional gun. A roller gun with enough extra rubber and multiple pulley combinations and attachments and cable CAN shoot a same weight spear at same speed as a 2 band conventional gun--opinion :)

  • Roller spearguns

    Quote from seal

    The idea of the puleys is to break the speed limit of normal bands.Every shaft has a limit that can be accselerated to with normal bands.Even if you store five time more energy in multi bands configuration,you will give to the shaft only a small part of it,the rest will go for recoil and drag.
    The idea of the pulleys and rollers generally is to aply a reasonable pack of energy to the shaft and get high velosity with minimum losses.
    I cant understand how people still wonder and dont understand that.Its so simple and we prooved it thousand times.'Its completely same relation between compound bows and classic bows.I came home from the US with a compound bow and can say that it is ten times better than the recurve.


    seal-- I love the craftsmanship of your guns and I respect your opinion on the concept of roller guns, however
    this ^^^ is just another vague analogy/opinion without proof, like formulas and math that PROVES nothing.
    I was directly involved with the Research and Development and field testing of the compound bow by Holles Allen and Jennings Co. back in 1969, so I KNOW and understand the concept/advantages/disadvantages of wheels. IMO, just measure true spear speed, like we did in 1969 with a clock and you have your winner and your loser. Simple/done.

  • Roller spearguns

    popgun pete--Thanks for taking the time for your clarifying post.


    Next--am I wrong to suggest that THE most correct method to MEASURE spear performance is by MEASURING true flight spear speed?
    example-- if spear A exits a roller gun at 300 feet per second (fps) and the SAME spear exits a conventional gun at 305fps, isn't the conventional gun outperforming the roller?
    IMO, spear penetration is a product of spear speed AND spear weight. Therefore, SAME spear flying from a gun producing a higher fps number would have greater penetration.

  • Roller spearguns

    NOW all he needs is an underwater CHRONOGRAPH to PROVE spear speed.


    Chuckd---thanks for taking the time and effort to make this comparison.

  • 2015 Guam Discovery Day Competition

    Oscar--I'm too old now to dive at their level.
    1 Leagues guy is Navy an 1 is civ
    If in 1980 I knew GuAm was like this, I would have sold EVERYTHING an moved here. :D
    The air is so clean, there is only 1 smoke stack in 400mi. The water is CRYSTAL clear. The jungle is soooo green year round. The girls r soooo friendly :rolleyes1: to white guys AND I got a senior discount at some of the massage parlors

  • 2015 Guam Discovery Day Competition

    When I first moved to Guam, Leagues Deep invited me into their circle. They happily taught me many things about how to hunt in these waters. They invited me to go spearin with them MANY times. They are good people and some of the most proficient freedive spearos I have ever met. :toast2:

  • 2015 Guam Discovery Day Competition

    Sorry Oscar, they texted me 3 pictures only so far. They are very busy right now so I am hoping they will log on here and give a full report and pictures ASAP. Plus, I do not want to step on their story. I'll post more info from them as soon as I get it. :)
    thanks

  • 2015 Guam Discovery Day Competition

    I'm gonna start this thread a little early in the hopes that these spearos log on later and write the complete report with pictures.
    Leagues Deep of Guam (ck Youtube for their vids) has entered and SMASHED the competition yesterday (28Feb2015) here on Guam. This was a shore dive, freedive, swim out, 1man up/1 man down competition. Just remember that here on Guam we can easily shore dive/swim, out to depths over 200-400fsw and this team CAN do the deepest and longest spearing freedives that I have ever seen.
    I am very proud just to know these spearos and want to congratulate them on their win. :hooray::toast2:

  • Roller spearguns

    Quote from parker

    Do tell, what is this EASY idea you speak of?


    Aaaaaaaw parker-- I think I'll keep this secret to myself a little longer brother. Lets see if someone else can figure out how to EASILY stretch a single stage roller band to over 400% WITHOUT using any mechanicals.
    C, I just gave u another clue;)

  • Roller spearguns

    Quote from Chase

    Isn't the point of the roller to eliminate most of the recoil, if not all?


    Correct you are.
    I used that extreme to illustrate how EASY my roller band rigging idea is to achieve over 400% with a roller.


    Next, we could talk about the advantages / disadvantages of the shorter spear out of a roller gun. :rolleyes1:

  • Roller spearguns

    NO ONE has yet to realize a HUGELY important band rigging method possible for roller guns. I cannot believe that NO ONE else has figured out this simple and easy method. I got this idea and tried it out on my RA roller conversion and could EASILY pull over 400%. In the end I had to lengthen my roller bands cause my hand kept getting bruised from the recoil.

  • Roller spearguns

    Quote from Treebilly3

    One rail gun and a roller muzzle is all you'd need. It wouldn't take long to swap out the muzzles
    Well and bands for each muzzle type.


    Yep, took me like 2 hours total to switch out a RA 110 (with ET) to a roller.
    Problem was I did not have an UNDERWATER chronograph to measure REAL spear speed. IMO, all this number crunching and math is USELESS unless you have chronographed spear speeds from each gun to PROVE the difference btw roller and conventional spear speeds. To this date NO ONE has chronographed these spear speeds comparisons.