Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

Latest topics

» swiss national museum crossbow LM-6010
by stuckinthemud1 Fri Nov 08, 2019 4:29 pm

» Nut Diagram
by banuvatt Fri Nov 08, 2019 11:15 am

» what depth to Install a Prod and angle
by globalmark Fri Nov 08, 2019 4:42 am

» Tickler Dimensions?
by Geezer Sat Nov 02, 2019 9:56 pm

» Pins in Trigger Mechanisms
by Gnome Sat Nov 02, 2019 3:49 pm

» How To Make a Roller Nut?
by banuvatt Fri Nov 01, 2019 3:16 pm

» Roller Nut Size
by banuvatt Thu Oct 31, 2019 7:59 pm

» anyone know anything about this one - updated with new image
by stuckinthemud1 Thu Oct 31, 2019 6:16 am

» Compound twinbow pistol (posts vs pulleys)
by c sitas Wed Oct 30, 2019 5:00 pm

» Laminating crossbow limbs
by banuvatt Mon Oct 28, 2019 4:33 pm

» Info required for old laminated limbs
by banuvatt Sat Oct 26, 2019 5:48 am

» Goats Foot Lever
by Arcuballista Wed Oct 23, 2019 12:47 am

» Jig for grooving bolts for wood fletching
by banuvatt Mon Oct 21, 2019 9:03 pm

» Cranequin drawings
by Crossbowman Sat Oct 19, 2019 8:46 am

» Drilling out the trigger grove?
by stuckinthemud1 Thu Oct 17, 2019 7:41 am

» finally started my first composite bow
by stuckinthemud1 Tue Oct 08, 2019 7:37 am

» Faux ivory
by kenh Mon Oct 07, 2019 4:36 pm

» Fish skin cover on early hornbow
by stuckinthemud1 Sat Sep 14, 2019 11:14 am

» what is nordic/swedish/northern style
by stuckinthemud1 Thu Sep 12, 2019 1:09 pm

» crossbow 17136, Royal Armoury Collection, Sweden
by stuckinthemud1 Sat Sep 07, 2019 1:26 pm

» notch lock trigger mechanism
by banuvatt Sat Sep 07, 2019 12:55 pm

» how made homemade (reverse) crossbow ?
by ali.j Sat Sep 07, 2019 12:08 am

» Metal clamps for bastard string
by Geezer Thu Aug 29, 2019 11:20 am

» Goats foot leaver design
by Geezer Thu Aug 29, 2019 11:17 am

» mounting sideplates
by Geezer Tue Aug 27, 2019 12:01 pm


    Model Aeroplane Rubber

    avatar
    yulzari
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 1
    Join date : 2018-12-02

    Model Aeroplane Rubber Empty Model Aeroplane Rubber

    Post by yulzari on Wed Dec 19, 2018 4:18 pm

    There is much discussion and examples of using latex tubing, office rubber bands, exercise bands and tubing and spear gun tubing. Most of this is about long draw lengths to suit the available materials.

    Long ago I researched the use of rubber for single seat racing cars and the industry experts recommended rubber in compression for inherent hysteresis (useful in the context to dampen the rubber movement in rebound) and that it should be in small bits squashed hard. Issues were set and softening with internal heat affecting the ride height. Now in the catapault context the requirements are opposite by and large. Thinner tubes/strips stretched to ideal lengths in draw used in multiples allows a shorter overall draw length, which eases the installation. They have a greater surface area so will lose heat more easily which is considered a problem for our use but this also means that they rapidly attain a stable constant power.

    The next step down is to obtain stretchy rubber which is yet thinner and this is easily found in the rubber used to power model aeroplanes. It is very thin. Although not very powerful individually it is thin enough to use far more strands than one normally sees in our devices. Kept suitably lubricated they will slide over each other without raising stress points or friction heat. Use enough and you can avoid all the pulley problems of installations to simplify installation. Either as gathered one piece strand bundles or as a continuously looped strand. Catastrophic failure is unlikely as the failures would be in increasing numbers of individual strands so allowing replacement before the whole bundle breaks unlike other systems whereby a breakage is of the whole band or tube. 

    Has anyone any experience of this material in bows or any views on the matter?
    avatar
    kenh
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 812
    Join date : 2012-08-03
    Age : 71
    Location : Living Aboard a Sailboat in Fort Myers, FL

    Model Aeroplane Rubber Empty Re: Model Aeroplane Rubber

    Post by kenh on Thu Dec 20, 2018 5:26 am

    Interesting information, but the vast majority of folks here are involved with 'real' crossbows, not rubber-powered gadgets.  Check with Joerg Sprave's Slingshot Channel, that's were the rubber stuff is happening.
    avatar
    chaz
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 305
    Join date : 2012-04-13
    Age : 71
    Location : Texas

    Model Aeroplane Rubber Empty Re: Model Aeroplane Rubber

    Post by chaz on Thu Dec 20, 2018 9:05 am

    ditto
    avatar
    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 519
    Join date : 2012-11-24

    Model Aeroplane Rubber Empty Re: Model Aeroplane Rubber

    Post by c sitas on Sat Dec 22, 2018 10:57 am

    Yulzan, I 've used a lot of things experimenting. You would surely want to try divers rubber tubeing.  I buy it on Ebay. Great stuff , lots of power. I use the 5/8" thick on two bows I,ve made. Study into how to fasten to them . It's all divers stuff and simple. The net is full of info. I followed a member by the name of Jeep here.We talked back and forth. He is now deceased, but I think you could still search him  here. He had a brilliant mind and went with lot of the chinese stuff with the crossbow.
    They were also brilliant when it came to the crossbow.We have a member here who has invented the fastest arrow slinger in the world but, it's not really a true crossbow.

    Sponsored content

    Model Aeroplane Rubber Empty Re: Model Aeroplane Rubber

    Post by Sponsored content


      Current date/time is Mon Nov 11, 2019 5:24 pm