In tough economic times, every penny counts. Here at the Fairway Bunker, we understand that and we’re always looking for ways to help you out. So, we’re back with 2 more coupon codes to help you save on what is quite possibly the most expensive hobby in the world.

The first code saves you $10 on any putter that costs more than $100.

Hey, every little bit counts. The code is 19PUTT, and it’s valid through January 30, 2010.

The other code saves you $10 on any golf bags over $125.

Again, I know it’s not much, but if you’re going to buy a bag, you might as well save something even if it’s not much. The code for this one is 19BAG, and it also runs through January 30, 2010.

So there you have it. If you have any questions, let us know. Save a little money on us. Go buy your kids some clothes.

Every now-and-then people ask me to explain Moment of Inertia, or MOI, because they see it in some of our equipment reviews on drivers. I figured if a few people have asked me about it, a lot of people probably have questions about it. So, here’s a quick explanation.

Moment of Inertia, or MOI, is a property of physics that tells you how easy or hard it would be to spin an object around a specific axis (think spinning a basketball on your finger). The harder it is to make an object spin on an axis, the higher the moment of inertia.

Pertaining to golf, all you really need to know is that clubs with high MOI do not twist as much on off-center hits. If you don’t hit the ball in the center of the club face, the club head wants to rotate around its center of gravity, or CG. So, if you hit the ball off the toe or heel of the club and your driver has high MOI, it will be more forgiving and give you better results.

Since golf companies like Nike, Callaway, and TaylorMade have lots of drivers with 460cc club heads, they have plenty of room to move the center of gravity lower and more rearward on the club head, which results in higher MOI.

MOI is also what make hybrids and rescue clubs work. They’re much easier to hit than a low iron because they have a club head like a driver or fairway wood giving the club higher MOI. If you take a 3-iron and a 3-hybrid, the club faces are set at the exact same degrees, but the hybrid will be easier to hit and much more forgiving on off-center hits. The CG of a 3-iron is just behind the club face, but on the hybrid the CG is further back and lower, making it more forgiving.

So, there’s a quick explanation. If you have deeper questions, please don’t hesitate to drop a comment below. I’ll answer you as soon as I can (which is usually immediately because I have no life).

Well, sort of free.

Our partners at Golf Galaxy are offering you a pretty sweet deal, though.

Through September 30, 2009, if you buy a set of Callaway FT Irons or Callaway FT i-brid Irons, you can get a free Callaway FT-iQ driver by using a coupon code.

Said coupon code is FTIRONDEAL. However, this deal cannot be combined with other coupon codes, and it can’t be used on past purchases. Nice try, though.

The Callaway FT-iQ driver by itself costs $500, so this deal has some pretty good value.

A quick note on the FT-iQ driver… I got to use it once. The first time I picked it up, the first words out of my mouth were, “Holy smokes, this thing is light!” You can get some serious swing speed because it’s so light. It also has a DEEP club face, which makes it easy to make good contact because there’s a lot of surface area from top to bottom on the face. It also has a square, 460cc club head, giving it some serious MOI.

It’s a good driver, and this is a great deal.

We also found some more great deals from Golf Galaxy, so if you want to see them, click here.