True Length Technology
True Length Technology as presented at the
Professional Clubmakers Society Annual Members Conference
February 25, 2007
True Length Technology is a registered trademark of
Dan’s Custom Golf Shop
“My long irons are too long and my short irons are too short!”
True Length Technology is my thesis to the golfing industry.
To become a Registered True length Technology builder and fitter
Tom Wishon said in his April 2008 E-Tech report
Fitting outside the traditional box – the concept of True Length Technology® from clubmaker Dan Connelly
I first became aware of clubmaker Dan Connelly and his TLT system for length fitting through TWGT’s Rob Sines. At the 2007 PCS Show, I had the opportunity to sit down and listen to Dan’s concept which flies in the face of literally decades of the golf industry’s traditional practice of changing the length of clubs by full inch or half-inch increments. After hearing Dan’s explanations for his True Length Technology™ length fitting methodology, I had to admit his work definitely has merit and should be considered by all Clubmakers. As a result, I asked Dan to write an article about his TLT system so we could expose Clubmakers to a brand new length fitting methodology that is most definitely worth all club makers’ consideration.
True Length Technology®
Have you ever been troubled by the condition of “My long irons are too long and my short irons are too short”? Every set of clubs I’ve owned in my 35 years of playing this gentleman’s game have fallen into that scenario.
- Currently a Precision Inspector (Metrologist) for the General Motors Canadian Regional Engineering Centre as a CAD programmer for the Coordinate Metrology Lab
- Past Chairman (2 years) of the Association for Coordinate Metrology Canada – devoted to educating and understanding micro measurement technology
- Durham College Graduate – Mechanical Technology Program
- Certified by the Ralph Maltby’s Clubmaking Academy in:
- Assembly and repair
- Professional clubfitting
- Master’s program (only 3 in Canada)
- Certified rifle center
- Certified by the Golf Clubmakers Association (GCA) with Professional/Advanced Status
- Owner and developer of the Proprietary Length/Lie/Fitting System – True Length Technology®
- Currently pursuing certification with the Professional Clubmakers Society
- Company A – Lie angles increment in ½ degree per club
- Company B – Lie angles increment in 1 degree per club
- Company C – Lie angles vary and don’t seem to follow a progressive pattern
- Feet shoulder width apart
- Knees slightly bent
- Spine tilted forward near 30 degrees
- Arms hanging down and slightly out from your body
- Slight amount of grip cap above my hand
- Lie angle looking correct at address
- Hit the ball straight
The Birth of True Length Technology®
- One at 56 and one at 57 degrees
- One at 64 and one at 65 degrees
Current True Length Technology® Status
- Hitting balls allows the fitter to be aware of swing tendencies and club head paths that do influence ball flight.
- Individual swings certainly do play an active role in determining the correct final lengths and lies.
- The golfer who sets up with the traditional stance will often find that the WTF measurement will often correlate to the Initial Target Series Chart and will indeed be very close to the final build specification.
- Single axis golfers and some women who carry their arms out and away from their body will in all likelihood need a set of greater length and possibly an alternative lie, deviating from what their WTF target indicated. Again, True Length Technology® is not a WTF system and traditional fitting procedures will insure a sound fitting to the individual.
- People with disabilities that cannot get into that traditional position may need a variation in length and lie, but will end up in their best athletic position – common to every club.
- All of the above scenarios need to be addressed by the fitter in determining what the proper “actual” build size will be. Once the Target Series Build Chart has been determined, the builder needs to build to the specifics of that Target Series chart keeping the math model intact.
- Now available 10 additional children’s charts.
True Length Technology® Fitting System
- Statically fitting with a variety of clubs
- Hitting balls with a variety of lengths
- Hitting balls with impact stickers
- Watching ball flight
- No, in fact many report back that they have actually increased distance due to more on center hits.
- A long set of clubs (Series 10) often will be built with the lightest head weights possible to help maintain a manageable feel and swing-weight to the set.
- A short set of clubs (Series 2) often will be built with heavier head weights to help maintain playable characteristics, feel, and swing-weight.
- A mid length set (Series 6) can be built to a single swing-weight or on a progressive slope (very similar to a Moment of Inertia set).
- Sometimes swing-weight is simply a resultant that cannot be controlled due to length and actual head weights, but as a custom builder you can minimize the variation.
- The entire set will need to be upright (or flattened) from the TLT standard, but in a uniform progression. If 1 club needs to be upright 2 degrees, then they all need to be upright 2 degrees. Remember, you still want to keep your math model intact.
- This depends on your type of wedge play. I keep the length of my gap, sand, and lob at the same length, but this means that their lies will also be identical. If you are only using half shots with some wedges than special attention may need to be taken to tune the lie as head flattening can be to a lesser degree.
- Wood shafts are thinner in the tip area and are prone to different bend properties. As the club is swung the center of gravity of the larger head is trying to get in line with the shaft axis at the hands. The size of the head and the location of the COG cause a higher degree of head flattening during the swing. Research has shown that woods built to their corresponding WTF charts have proven to be the most effective.
- A very repeatable athletic address position
- A very repeatable swing pattern
- More on center hits
- Less fat shots
- Less thin shots
- Improved feel and play ability
- Less physical stress on the body
If you are interested in becoming a ‘Registered True Length Technology® clubmaker and clubfitter’ – the charts are available in EXCEL format on my ‘Clubmaker’s Registry’ page.
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