Omer 110 Excalibur 2000 Dual Rubbers??

[skweggnog]

Hey everyone I current run the stock single rubber on my 110cm Excalibur and was wondering if anyone can recommend what thickness and length rubber I could run as a secondary if you would advice that at all. The gun has the closed muzzle so can take a second and has the shaft has two notches.
Thanks!

 

[Pinniped72]

From memory I think it has a 6.3 or 6.5mm spear, I personally wouldn't go above 2 x 14mm bands which would also be beneficial as 14mm bands are noticeably easier to pull back than the stock 18mm band, I have an Omer cayman and I think the excaliber also has 18mm bands as standard. Were are you fishing and what do you expect to spear?

 

[skweggnog]

I fish around the coast of nsw so fairly open/deep and wouldn't mind having a bit more speed/distance with the shot. The set of 18mm ones on it are good it just seems to drop off fairly quick. By 2x14mm do you mean run 14's for the screw in ones and then another 14mm as the secondary? I wish I got the Cayman My Excalibur is still in way too good condition to go buy another gun and when I got it about 6 years ago it wasn't exactly cheap!

 

[mighty kc]

i use 2x16mm on my Omer MB30 90CM. Works fine for me.

 

[skweggnog]

Yea but 2 as in the 2 screw in singles or 2 as in the set of singles plus a secondary rubber (loop through muzzle)?

 

[Pinniped72]

You may have options you could use one set of screw ins and a circular, that would be fine. I have tried 14mm in my Cayman and could squeeze 2 x 14mm through the circular band slot having two circular 14mm bands, it is a tight squeeze with the cayman and I have never had an Excalibur so cant say for sure about that, but either way its nice to have options

 

[skweggnog]

Would anyone suggest running the stock 18mm with a 14mm loop through the muzzle?

 

[Pinniped72]

You are better off with bands of the same size, they will contract at the same rate, there is a marked difference between the power of a 14 and 18mm band.

 

[Rugbyfan]

I have open head with 2x 14mm circular with dyneema cut to 1:4.2 on my short omer hf75.
Less recoil than 2x16mm and much more power than stock 18.



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[Pinniped72]

By cut to 1:4.2 do you mean that the bands are stretched to 420%?

 

[mighty kc]

Yea but 2 as in the 2 screw in singles or 2 as in the set of singles plus a secondary rubber (loop through muzzle)?

the 2 screw in, with one looped thru the end. (correction, the MB30 has 20mm screw in, and i add an additional 16mm loop).

Also, i have a T20 (My favorite Omer Gun) with 2x16mm loop bands.

 

[Rugbyfan]

By cut to 1:4.2 do you mean that the bands are stretched to 420%?

Yes


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[Mr. X]

From memory I think it has a 6.3 or 6.5mm spear, I personally wouldn't go above 2 x 14mm bands which would also be beneficial as 14mm bands are noticeably easier to pull back than the stock 18mm band, I have an Omer cayman and I think the excaliber also has 18mm bands as standard. Were are you fishing and what do you expect to spear?

I agree with Pinniped72's post above. Presumably your spear had 2 notches to accept a second wishbone? 2x14mm seems like a pretty cool configuration - but unusual (outside of Hawaii). Probably works best using all bulk rubber though (can you buy screw-in 14mm rubbers?). We estimated that 2x14mm would be about the same or slightly more powerful than 1x20mm (but see my comments on bulk rubber diameters below*).

Re. using a supplemental 14mm band with your existing 18mm band, I reckon that would probably work but might over-power your spear if it is particularly slim (what diameter is it?). My Omers have 6.3mm spears, my RA had 6.6mm but RA offers at least 2 sizes bigger than that and RA fit larger diameter spears on their 2x16mm Tuna model - 7.2mm perhaps? - to deal with the extra power).

Another option occurred to me: remove your screw-in bands and replace them with a single 3/4" bulk rubber loop. *Bulk rubber sizes aren't precise but they typically offer 3/4" rubber which is variously referred to as 19/20mm (or possibly 18mm). This is what I have done on my Omer XXV75. The advantages of this are:

(1) There is a greater length off rubber is in play because it is goes right to & through the muzzle hole up front (RA reckon their closed muzzles use about 10cm more rubber than an equivalent screw in band set-up!

(2) The American bulk rubber used on most railguns is generally more powerful (and harder to load, especially when new) at least partly because the walls are significantly thicker than typical screw-in bands, and the hole in the middle is consequently smaller.

(3) Bulk rubber is significantly cheaper. Shop around. spearitco.com in the USA sell on their own website, ebay and I think I saw them on Amazon recently. I bought rubber from them & it was very fresh (I keep my spare rubbers, sealed in a plastic bag in the deep freeze to keep them fresh). I think European brands (e.g. Omer, Dessault) now offer "circular" bands - I can't comment on their power/price.

(4) I was also able to remove the metal muzzle wishbone & screw-in fittings from my XXV (this is something peculiar to certain Omer models). Which (along with the lighter Dyneema wishbone) help offset any weight increase from the extra rubber [ref. to #1 & #2 above].

This seemed like a simple, cheap, effective alternative to me but you'll need to figure out what you will use for a wishbone (I used Dyneema which requires the wishbone notches on the spear to be grooved & smoothed - easy for me as I had an RA spear to use as my guide).

Looks like somebody already did something similar here with a carbon excalibur: https://forums.deeperblue.com/threads/good-tune-for-omer-excalibur-carbonium-120.71294/

 

[Mr. X]

Alternatively:
Could you simply buy more powerful bands for your speargun (e.g. 20mm or some fancy compound 18/19mm bands? Spaghettic used to rate French Dessault rubber). When did you last change your bands?Perhaps just fitting fresh new bands the same as you already have would help.

...Or sell/trade your speargun (ebay/local spearos/spearo store) and buy something more powerful (e.g. railgun with 2x16mm bands and/or perhaps a longer barrel, if visibility permits).

...Or just live with what you got (it seems to me that the importance of power is generally overestimated and the importance of all other factors is generally underestimated). Also, being happy with what you already have is perhaps the secret to happiness!

 

[Pinniped72]

Alternatively:
Could you simply buy more powerful bands for your speargun (e.g. 20mm or some fancy compound 18/19mm bands? Spaghettic used to rate French Dessault rubber). When did you last change your bands?Perhaps just fitting fresh new bands the same as you already have would help.

...Or sell/trade your speargun (ebay/local spearos/spearo store) and buy something more powerful (e.g. railgun with 2x16mm bands and/or perhaps a longer barrel, is visibility permits).

...Or just live with what you got (it seems to me that the importance of power is generally overestimated and the importance of all other factors is generally underestimated). Also, being happy with what you already have is perhaps the secret to happiness!

The live with what you have philosophy has a lot going for it, I think there is so much choice now, it turns us into kids in a sweet shop..................... it does me anyway Out of interest, with my Omer Cayman I finally decided to go with a bulk 18mm single sling, I prefer the simplicity of a single sling and the power that a single 18mm sling generates is considerable. I know its a different kettle of fish but I use a bulk rubber single 18mm band on my Ray Odor pole spear, it gets that thing really moving and its is not lightweight by any stretch of the imagination! Anyway you have multiple options, good luck and keep safe