How Are Drivers Created?


with Mikey eglee from Cobra golfing as

you can see we have a mock-up of the f7

driver here and there's a lot of

different parts a lot of different

materials that that go into making a

driver head what it is you know

essentially how it's gonna perform how

it's gonna sound and you know as

somebody who designs these driver heads

I kind of wanted to ask you about the

different materials and what exactly

does go into making this driver

something that's gonna perform for a guy

like me so I'm gonna go back about 15 20

years and I was working for Boeing

designing airplanes and I was working in

a group that was literally tasked with

designing a high-speed civil transport

so we were and this was like the next

generation Concorde and the group had a

propulsion system group we had an intern

Anna group that societies and I was in

Lois Peter and Emma group structures

group yet a fuel system group payloads

group you know you had all these groups

okay and it was a very complicated

structure and a very complicated problem

that we didn't even know if we can

converge on a solution right to make a

supersonic transport that could actually

be cost-effective met the sound criteria

for takeoff and landing was able to

transport the number of people you want

to transport back and forth okay a

highly complex problem I get into golf

and I'm thinking oh this is gonna be


smaller scale yeah it's no big deal is

this going to be shocking at how complex

and how difficult it is to make this

simple looking little structure sound

good feel good perform well and be

durable there are so many things going

on inside a golf club that I was shocked

and want to describe it to my aerospace

buddies and my former Boeing buddies

they had had no idea and a lot of more

golfers right you look at you know it's

a golf club how hard can it be right

it's pear-shaped I swing it I

Oh simple so I'm here to tell you this

is a highly complex structure that has

to do things that rocket ships and

airplanes aren't required to do and like

I said look good feel good sound good

and perform well so let's start with the

face right simple titanium plate right

now we've gone a little bit exotic we're

using eight eleventh eye which is a

lower density high strength very

resilient titanium material okay okay

seems simple enough

well check out the back right do you see

the contouring that's on there yes right

right in there

yeah so imagine man months or more

optimizing exactly where these pads are

well this is this is thin that's then

and that's a little bit thicker and you

can see that shape right I changed that

shape by literally fractions of a

millimeter and you go from a golf club

that sounds good feel good it's durable

right and then suddenly we find out an

FAA analysis that it starts cracking

right we find out that it's either too

fast or too slow from brazilians

standpoint we find out that it actually

starts to sound pork just by changing

the face thickness by fractions of a

millimeter okay that's just the

beginning you get into then the entire

head and again you look on the outside

you're like oh that's a fairly complex

structure but look what's going on on

the inside all right in order to put a

12mm weight 12 gram weight in any of

these locations and have it survive have

it sound good look at the rib structures

that have to be added in order to make

that work and these ribs you can see the

length of the thickness of it you

changed that thickness by again

fractions of a millimeter and you go

from a weight that is held on here very

nicely and it survives thousands of hits

to nope it rips right out literally in

just a couple of hits or you go from say

3800 Hertz which is a really good sound

in golf club when you

got the weight in that position and you

move the weight over to this position

you change these ribs just a tiny bit

and it goes to about 3,200 hits

hurts and you and I would both say that

is the worst sound in golf club we've

ever heard in our lives right on the

same head so our designer and research

guy in my group spent an awful lot of

time optimizing these what seemed like

little ribs simple root structures the

location the thickness the height so

that when you put the weights in any of

the positions

it sounds basically the same feels

basically the same so that you don't

have any complaints and these are all

the things that we've got to really

grind down hard in the background and we

just started here with the tie structure

you move into the hosel area and you can

see unlike many of our competitors

there's no structure in between the

hosel and the base where the screw sits

there's nothing in there see that mmm

that saved us several grams of weight so

we had to engineer the heck out of this

thing so that we could remove that

weight and put it in places where we

really wanted it and again it would

survive 3,000 hits they would still feel

good it would still sound good you look

at the rest of the head and we put a

carbon fiber crown on here and you can

see at Xtreme pattern on there this

crown if it were made out of titanium

would wave several grams more which

would raise the center of gravity which

would lower the moment of inertia so we

work really hard at putting an extremely

lightweight crown on top of this head

and the structure required to bond it to

get it to stay on feel good give you the

sound properties that you want give you

that 3800 Hertz that we're talking about

incredibly hard to do from a shaping

from a thick

this from a overall said attachment to

that head standpoint getting it to stay

on not crack not a trivial exercise so

it's not rocket science but it's more

difficult than rocket science

Italy honestly it's a heck of a lot more

difficult than some of the things we've

had to do that I've got doing my career

to make a rocket fly to make an airplane

fly yeah it's it's a very very complex

highly dependent on mass property

structure how it's bonded and joined

right and optimizing the feel the sound

the durability the overall mass

properties very complex problem one last


talking about the you know weight

savings so we talked about how there's

nothing here which saves weight the leg

of crowns saves weight you know take its

smoothing out some areas the face saves

a little weight when it comes to

reassigning where that weight goes if

you're going to or you can just

completely remove it but how difficult

does it become to figure out if the

weights got to go on this root structure

or anywhere else within the head so that

it doesn't adversely affect all of those

other things that we've been talking

about I would express a difficulty in

like time so the answer the short answer

is it can be very difficult and we could

literally move one of these weight ports

just a couple millimeters and it could

take weeks for the guys to go back and

forth to figure out exactly what the rib

structure needs to be what the thickness

of the titanium in that area needs to be

in order to hold that weight properly

and sound good so it's one of my

favorite phrases are it's not trivial