We ran the leopoa poker run yeasterday on lk st clair had a good time got some time before we broke a splined input shaft to the coupler on the flywheel we knew it was the weak link took a look at them with just 20 hours on them and already twisted one so changed them both and was going to keep and eye on them well we tested it in the rough stuff and it failed back to the drawing board like i said this boat is really the true prototype 30 with a lot of innovation and we are getting it sorrted out but this half the fun will post pics of the ****ty merc part on monday

here is the pics of the broken part

Winner!

p.s. who is that in the picture on the desk?

Jim what diameter is that spline? You have some pretty good torque
there.
Dont know if there still around but Zeiger industies in ohio could make that up.

Knowing Merc, the part is probably cast...


I love the boat/project!

You Sure Had The Lap Top On That Alot At LOTO ,,,You Get It Squared Away?? We Had The 28 That Was Next To You,,,,

Hey Jim, It was great meeting you and your crew at the P/R. I'm very impressed with the boat and can't wait for my ride!:drink: P.S. there is a funrun on the 23rd on St. Clair if you can make it. PM me if interested and I'll email ya the info... CHEERS

i have a company making me some right now out of flexor steel its hard but not brittle perfectfor this mercurys were soft

that picture was me on the drag sleg i won the michigan state grass drag championship in 1980 was on michigan out doors interveived by jerry chipetta

FYI FLEXOR Steel
 

FLEXOR steel is both unique in its chemistry as well as its wide variety of properties. FLEXOR steel is a Chromium-Molybdenum-Tungsten alloy steel which exhibits a fine grain microstructure. All FLEXOR steel heats are a vacuum degassed, ladle refined, electric arc furnace melt (EAF & LF & VD). All FLEXOR steel is forged or rolled from bottom poured ingots. FLEXOR steel has a minimum ingot reduction ratio of 3.5:1.

FLEXOR steel's unique residual chemistry is a special blend that adds to machinability without sacrificing properties.

FLEXOR is typically stocked in an as rolled condition. This means that when FLEXOR is rolled or forged from an optimal reduction ratio and cools in open air from 1700 F a fine grain microstructure is formed. This also gives the bar a consistent toughness measuring 28-32 HRC throughout the bar.

It is important to note that FLEXOR steel does not need to be normalized or annealed prior to hardening from this condition. This makes FLEXOR extremely versatile especially when it comes to thermal treatments.


Typical Chemistry Composition
C Cr Mo W Mn S Si P
.34 .85 .50 .50 .80 .015 .30 .015

Physical Properties
Density 7.543g/cm3 per ASTM B311
Specific Heat .16 Btu/lb/°F




Mechanical Properties 30 HRC 40 HRC 45 HRC
UTS(ksi) Per ASTM E8-04 147 183 225
YS 0.2% offset Per ASTM E8-04 134 171 205
V-Notch Charpy Impact Per ASTM E23-06 80 45 21

RA% Per ASTM E8-04 64 60 50

Elongation Per ASTME E8-04 21 18 12

Poisson's Ratio per ASTM E111-04 .282

Young's Modulus per ASTM E111 30900 (ksi)


Properties may vary depending on microstructure, grain size, chemistry, hardening technique and overall ingot reduction.



:angry-smiley-038: Hopefully they won't fail !!!!!!!!!!!!!!!