Gear ratio question

[12poundbass]

While waiting for my groceries to be loaded this morning I was watching Edwin Evers YouTube channel the video was “Prespawn 101”. He was talking about gear ratio and said if you don’t have a low speed reel all you have to do is fill the spool of your high speed reel half way and this’ll slow your high speed reel down. 
 

I’m not looking to do this since I’m good on low speed reels but I’ve never heard of this and was wondering how this works? 

[jimmyjoe]

   Worked fine; I used to do it when I used the Ambassadeur reels, but I don't use those reels any more. How well it works with the lo-pro reels that have a smaller spool diameter, I can't say.     jj

[Team9nine]

Yes it works, but some reels not so well because trying to control the spool rotation with your thumb like you might normally do is a little trickier when it needs to go halfway into the spool without touching the spool sides and prematurely slowing or stopping the cast. Seems like narrow spools with high/steep sides are the toughest. Personally, not a fan of the idea, and so I own several lower geared reels for these applications, but I’ve done it.

[MN Fisher]

The IPT rating printed/published is for a full spool. The lower the line gets on your spool, the less IPT you have during retrieve. That can decrease by 10%-20%...40% depending on how low on line your spool is.

[OkobojiEagle]

underfilling the spool will also help with "over-run" issues... aka back-lashing.

 

oe

[Deleted account]

34 minutes ago, 12poundbass said:

While waiting for my groceries to be loaded this morning I was watching Edwin Evers YouTube channel the video was “Prespawn 101”. He was talking about gear ratio and said if you don’t have a low speed reel all you have to do is fill the spool of your high speed reel half way and this’ll slow your high speed reel down. 
 

I’m not looking to do this since I’m good on low speed reels but I’ve never heard of this and was wondering how this works? 

The effective diameter of the spool is smaller hence the IPT will be lower. I filly 6.3s size 200s about 3/4 sometimes. 

31 minutes ago, MN Fisher said:

The IPT rating printed/published is for a full spool. The lower the line gets on your spool, the less IPT you have during retrieve. That can decrease by 10%-20%...40% depending on how low on line your spool is.

I'm surprised Shimano hasn't copyrighted VRR....  

[garroyo130]

It will likely also hurt casting distance.

 

Its also important to remember that spool diameter itself makes up a significant portion of the IPT on a reel.

 

a half filled spool ≠ half the IPT

[MN Fisher]

Just now, garroyo130 said:

It will likely also hurt casting distance.

 

Its also important to remember that spool diameter itself makes up a significant portion of the IPT on a reel.

 

a half filled spool ≠ half the IPT

Ya, it's simple math to calculate

Empty spool diameter * 3.14 * gear ratio = IPT empty

Full spool diameter * 3.14 * gear ratio = IPT full (which should be darn close to the published IPT.)

[ironbjorn]

Filling your spool properly and reeling slower is an option too.

 

[Deleted account]

54 minutes ago, garroyo130 said:

a half filled spool ≠ half the IPT

It does if "half filled" means half the diameter of the filled spool, then it is exactly 1/2 the IPT of a full spool.