Reel Inches Per Turn Clarification...???

[ITO_ZILLION]

Kind of confused. When a reel manufacturer states/lists the inches per turn for a given reel, at what casting distances or spool depths are they measuring at to get their numbers/inches per turn when you first start to turn the handle for your retrieve...? So is it...

 

A. When the spool/line capacity depth is deep/low-ish at the end of a long cast.

B. When the spool/line capacity depth is middle of the road/medium-ish at the end of a average cast.

C. When the spool/line capacity depth is shallow/full-ish at the end of a short cast.

 

To add even more confusion, line size also plays a role in inches per turn. The thinner the line, the more line you can put on the reel and therefore leaves more line on the spool after a cast, thus keeping your inches per turn high. Likewise, the thicker the line, the less line you can put on the reel and therefore leaves less line on the spool after a cast, thus making your inches per turn low.

 

I would like some clarification as to how reel manufacturers come up with their inches per turn since they don't indicate anywhere what so ever what kind of line size, casting distances or spool/line capacity depths they are measuring their inches per turn at. 

 

 

[jimmyjoe]

   Advertised IPT is just that; advertising. It's pretty much a fantasy, like MPG for cars. It may help for comparing models within the same manufacturer's set of reels, but that's all. Even then, it's not really accurate, if for no other reason than the line diameter problem that you stated. If you need really accurate figures, you really need to measure it yourself with the specific line you use.                  jj

  

  

[GRiver]

I was told.....bonjour.... so don’t take this to the bank. 
It my understanding they rate the reel for IPT  at nearly full spool. 
so you only really get advertised IPT for the last few turns.

Like I said this is that I was told..... don’t even remember who told me. Hmmm.... 

[bulldog1935]

in reality, the ipt is a more important measurement than the gear ratio, especially if you're going to compare different reels for a fishing niche.  

 

Both get over-thought - there's no reason to assume it's accurate to two significant digits, nor does it need to be in order to be a useful measurement for fishing, or even for spooling stacked lines - it's going to be close-enough if you're counting revs to fill your backing.  

 

Published spool capacities and line diameters aren't that accurate, either.

 

 

you can also adjust the way the reel feels when fishing by adjusting handle pitch - longer handle has the effect of slowing down the reel and increasing torque through the gears, while shorter handle pitch has the effect of speeding up the reel.  

[fishballer06]

7 hours ago, ITO_ZILLION said:

A. When the spool/line capacity depth is deep/low-ish at the end of a long cast.

B. When the spool/line capacity depth is middle of the road/medium-ish at the end of a average cast.

C. When the spool/line capacity depth is shallow/full-ish at the end of a short cast.

 

I would like some clarification as to how reel manufacturers come up with their inches per turn since they don't indicate anywhere what so ever what kind of line size, casting distances or spool/line capacity depths they are measuring their inches per turn at. 

 

As someone who is an engineer, I would assume that IPT is figured out this way:

 

OC (outside circumference) of the spool x Gear Ratio (rotation of the spool per turn) = IPT

[Deleted account]

Full spool

[J Francho]

3 hours ago, fishballer06 said:

 

As someone who is an engineer, I would assume that IPT is figured out this way:

 

OC (outside circumference) of the spool x Gear Ratio (rotation of the spool per turn) = IPT

For consistency, I would hope it is measured this way, or at least reported this way in reviews.  It makes comparing different reels a bit easier.  The exact number itself, doesn't mean that much, other than anything over 36" is fairly quick, and below 25" is fairly slow.  It's a nice spec to use as a starting point when shopping.

[ITO_ZILLION]

4 hours ago, BassWhole! said:

Full spool

Having a IPT rating at full spool makes no sense at all. A full spool means there is NO cast and no cast means you are NOT fishing at all haha LOL =). So what's the point of even having a IPT in the first place if its rated at full spool and there is NO cast and you can't fish haha sounds like a moot point honestly.

[roadwarrior]

1 hour ago, ITO_ZILLION said:

Having a IPT rating at full spool makes no sense at all. A full spool means there is NO cast and no cast means you are NOT fishing at all haha LOL =). So what's the point of even having a IPT in the first place if its rated at full spool and there is NO cast and you can't fish haha sounds like a moot point honestly.

It's an estimate, a reference point.

[Deleted account]

3 hours ago, ITO_ZILLION said:

Having a IPT rating at full spool makes no sense at all. A full spool means there is NO cast and no cast means you are NOT fishing at all haha LOL =). So what's the point of even having a IPT in the first place if its rated at full spool and there is NO cast and you can't fish haha sounds like a moot point honestly.

I'm backing away slowly while holding out a picture of my family...

[WRB]

Inches per turn or IPT is calculated using the spool diameter, not spooled diameter line on the spool, diameter times Pi times gear ratio = IPT.

Having measured all my reels over the past decades this formula  is a close as it gets. 

Actual IPT varies as each layer of spooled line changes. The spool diameter and spool width are fixed as is the gear ratio. It’s the line that gets reduced capacity during the cast and retrieve. Average 100 size bait casting reel the IPT drops about 40% after casting 50 yards. 

In practical terms you must turn the reel twice as fast the move the lure the same distance forward as when it’s next to the boat.  

A 300 size bait casting reel with larger diameter and wider spool the IPT reduces about 20% after casting 50 yards or half as much as the 300 size reel, less effort to control the lures forward speed.

Tom

[CrankFate]

I’ll just throw this in there, on BFS reels the IPT is most accurate.

[jbrew73]

5 hours ago, CrankFate said:

I’ll just throw this in there, on BFS reels the IPT is most accurate.

What makes them more accurate than a standard reel?

[bulldog1935]

the spool is only a few mm deep - same can be said for spinning reels with braid-specific spools.  

 

[Deleted account]

I want to roll up some of ya'lls stash....

[QUAKEnSHAKE]

4 hours ago, jbrew73 said:

What makes them more accurate than a standard reel?

 The thinking that they are is incorrect. Bc or spinning shallow spool doesn't increase/decrease or make ipt more accurate. 25-50-100' feet of line out doesn't make the dia. of remaining line on  shallow/regular spool any different only overall capacity.

[bulldog1935]

On 4/7/2021 at 7:00 AM, bulldog1935 said:

Both get over-thought -

 

what he said

[J Francho]

I'm waiting for someone to point out width of spool, and it's effect on IPT when line is cast out.

[jimmyjoe]

5 minutes ago, J Francho said:

I'm waiting for someone to point out width of spool, and it's effect on IPT when line is cast out.

 

[J Francho]

Next up on reel talk - drag coefficient - what does it mean for you?

 

I'm kidding, but in comparing reels, you need a consistent spec.  Using the spool diameter and gear ratio is one way.  It doesn't mean one number is better than the other.  Sort of like bhp/torque when talking cars.  There's a few other factors that get the car to 60 mph, but we still measure bhp/torque the same way.

[CrankFate]

6 hours ago, jbrew73 said:

What makes them more accurate than a standard reel?

The shallow spool means that you never get deeper in the spool. A large half full spool will have a very different IPT than a shallow spool.

[JustJames]

My reel show IPT of 20.5-29.5” pretty accurate in my book ??.

[J Francho]

1 hour ago, CrankFate said:

The shallow spool means that you never get deeper in the spool. A large half full spool will have a very different IPT than a shallow spool.

What about a half full shallow spool and a full deep spool?  What if one has 2# braid and the other 100# fluoro?  When comparing reels, it helps to keep things consistent. 

 

My Stradic 2500 and 3000 are exactly the same IPT resting or with a cast worth of line out.  They are evenly loaded with the same line.  Same goes for the Two TD-X reels, one with a stock V spool, the other with a shallow Avail.  I don't know why anyone would compare a half full reel with a full reel.

[CrankFate]

2 hours ago, J Francho said:

What about a half full shallow spool and a full deep spool?  What if one has 2# braid and the other 100# fluoro?  When comparing reels, it helps to keep things consistent. 

 

My Stradic 2500 and 3000 are exactly the same IPT resting or with a cast worth of line out.  They are evenly loaded with the same line.  Same goes for the Two TD-X reels, one with a stock V spool, the other with a shallow Avail.  I don't know why anyone would compare a half full reel with a full reel.

One of the sometimes marketed benefits of shallow spools is consistent IPT and drag, because there is a minimal difference between full and half full spool diameter. But yeah you’re right a full spool with thin line will be consistent, too. There was a time when widened shallow spools were being sold overseas to add to consistency in drag and IPT. They make a lot of spinners with taller spools than they used to now, I always assumed that is because of what you’re here.

[J Francho]

There isn't any difference in IPT between a shallow and deep spool of the same width and diameter.