I see some glass rods are fast, mod fast, or mod. What's the difference when the material is still glass anyways?

Firs read about E Glass and S Glass rods. then remember we have glass rods and glass and carbon, or glass and graphite mixes as well.

I am fan of S Glass(S-Glass, carbon graphite composite blank)rods for cat fishing, they are Moderate and Moderate fast action.

Glass builds a rod that has a lower resonance frequency.

If you tap a glass rod, and tap a similar spec graphite rod, you'll see and feel the difference in the frequency of the vibration. A rod is a bit like a tuning fork - it has a natural resonance frequency.

They are also more forgiving in their flex characteristic. More flexible. A longer spring to make an analogy.

Thought is this helps to keep fish "pinned" as a bass swims far to near.

 

Try one.

Only way to really know if you'll like it.

 

I like 'em. Fish with both. Enjoy using both glass and graphite.

But I like changing things up - as long as changing between two things that perform well.

 

Karl

 

 

   'Glass rod with fast action? Where did you see that?  

   It's not impossible, but the existence of graphite has made it impractical.                jj

Jim's onto something, but you can make glass, especially S-glass, light weight and make it faster by increasing the rod blank diameter.  

My St. Croix Legend (S-) Glass is rated MM, and is the most perfect spinning rod for kayak fishing I've ever used.  It's also surprisingly light in hand for glass.  

Kind of by definition, glass is always going to have a softer tip than tubular graphite.  

 

As an aside, but maybe still appropriate, I have a glass/graphite blend Lamiglas Perigree fly rod, 7-1/2' 5-wt, that is an absolute pocket rocket, stunning light weight, and here, blended glass/graphite works better than graphite alone can - making a stronger rod and better taper than graphite alone, while lighter weight and crisper action than glass alone.  

 

An example is the dobyns 705 cb glass is rated as fast action while a shimano expride glass is rated has moderate even though both is made of out of the same material

13 hours ago, jimmyjoe said:

'Glass rod with fast action? Where did you see that?  

Not saying I understand it, but here's another.  Can't roll the blanks fast enough evidently.

https://alxrods.com/collections/zolo/products/zolorumble

15 hours ago, johnsmith said:

I see some glass rods are fast, mod fast, or mod. What's the difference when the material is still glass anyways?

Not sure I understand your question, but besides weight and being sensitive (more of the first, less of the second) what makes glass a good choice for larger treble lures, and certain other moving baits is the recoil speed. When bent, a glass rod doesn't want to straighten as quickly as a graphite one. Makes for a better fish fighting rod, at the expense of a working a lure and detecting bites rod. As far as action, a rod of any action can be designed from either material.

12 minutes ago, CountryboyinDC said:

Not saying I understand it, but here's another.  Can't roll the blanks fast enough evidently.

https://alxrods.com/collections/zolo/products/zolorumble

 

   If you read the description carefully, you'll see that this rod is a graphite body with a fiberglass tip on the end, somewhat similar to the Kistler Feel'n'Reel rods. To me, that's not a fiberglass rod.

   As for the Dobyns rod, I suspect that it might have similar construction, but I don't know for certain.

   I would be cautious about describing the Dobyns rod and the Shimano rod as 'Identical material".

   As @bulldog1935 has said, you can make a fiberglass rod with fast action. Silaflex did it before they were bought out by Browning. But the resulting rod has never appealed to fishermen after 1975, when the HMG series from Fenwick hit the market.

 

   So I think the answer to the OP's question is simple: the material isn't ACTUALLY still the same.

 

   jj

 

  

6 hours ago, jimmyjoe said:

somewhat similar to the Kistler Feel'n'Reel rods. To me, that's not a fiberglass rod.

I didn't read that carefully, just saw the ad they sent a while back, and assumed glass meant glass, not composite.  My Feel 'n Reel is still a moderate taper, I was assuming they made it that way to make it lighter (it's a 7 1/2' heavy, powerful rod).  Still don't know that I'd want a fast tapered glass or composite rod.  I love my St. Croix glass rod, though, for crankbaits.

11 minutes ago, CountryboyinDC said:

I love my St. Croix glass rod, though, for crankbaits.

 

   Me, too!               jj

9 hours ago, johnsmith said:

An example is the dobyns 705 cb glass is rated as fast action while a shimano expride glass is rated has moderate even though both is made of out of the same material

Dobyns Glass rods are Composite, or a mix of Glass & Graphite, but I think the Exprides might be also.