Whats the difference from CSH to OSY 400?

[KG4]

Are they the same?If not what is the major difference?Thanks a ton.

[ZUL8TR]

Here is Pro Tech manual

There is a weight limit of 396lbs. See page 35 for more on OSY 400:

http://www.apba-racing.com/sites/all...205-9-12_0.pdf

[roperz111]

Bob,

OSY-400 is the U.I.M. class designation that currently runs the Yamato Y102, Y202 & Y302 engines. APBA adopted the Y102 as its C Stock class engine back in the late 1980's, phasing out the old Mercury's. APBA added the newer Y302 engine to the C Stock classes in the 1990's when the new motor came out.

In U.I.M. the class is run with Yamatos that are NOT machined or enhanced in any way, completely "box-stock" legal so to speak. Also, they use a LeMans beach start (ours clock start).

Originally here in the U.S. the OSY-400 class started out circa 1993 in the PRO catagory as a PRO/UIM class. The main rule difference between OSY-400 and C Stock Hydro (CSH) was:
1. no minimum weight in OSY-400.
2. only a TWO-blade prop was allowed in OSY-400 (CSH allowed 3-blades).
3. all technical specs regarding the existing C Stock yamato were required for the OSY-400 engines.
4. the clock start was used.

The class survived in the PRO category but the 2-blade prop rule was changed to allow standard CSH 3-blade props. This in effect made the OSY-400 simply a C Stock Hydro "lite" class, completely identical to C Stock Hydro except for the minimum weight requirement.

However, this year some of our more enterprising members have taken a bold step to re-vamp the OSY-400 class to match the existing U.I.M. version. They are using box-stock motors, LeMans starts, and minimum weight of 396lbs. I'm sure the venture will work given enough time.

Hope this little history lesson helps...lol (I'm sure if I made any errors they will be addressed).

Chris Johnson
111-Z

[bill boyes]

The motor used was the Y 80 with a 2 blade and was a claimer class and was called Novice. When the 302 came out and the SORC invented the C2 class the Pro Commission approved the Y302 and changed the name from Novice to OSY. Early 1990's

[KG4]

Thanks guys,I appreciate it.

[roperz111]

The motor used was the Y 80 with a 2 blade and was a claimer class and was called Novice. When the 302 came out and the SORC invented the C2 class the Pro Commission approved the Y302 and changed the name from Novice to OSY. Early 1990's

Maybe you guys out west ran the Y80's in OSY-400 but the rest of the country used the Y102. The Y302 was not approved for OSY-400 when the class started in 1994. The only motors approved were the Y80, Y102 and Y202 (which nobody here in the U.S. had). The Y302 was approved for the newly created C2H (C2 Stock Hydro) class in the Stock category also in 1994.

[bill boyes]

Check the history. Novice was a pro class with a y80 and a 2 blade, When the 302 came out the pro Commission approved the 302 and 102 for the renamed OSY class. No weight and kept the 2 blade as the propeller. Couple of years later approved the 3 blade.
This was not an east/west deal at all. I know because my son ran the class out west and did run the class at Depue with both the 2 blade and 3blade. This was the only class where we could run the 302 with out the c2 in Stock.

[roperz111]

I did check "the history" and the attachment below is the evidence. This is the page from the 1994 APBA Rule Book in the PRO Category section under legal motors. As you can see, the only motors that were legal for OSY-400 in its inception were the Y80, Y102 & Y202 (NOT Y302). The 302 was brought in under the stock category in the then new C2H class as I stated earlier.

[bill boyes]

Look, the 302 motor was being sold and really no place to go except C2 thanks to the SORC. I am not disputing the fact that 102,202 not approved in the pro category. Thanks to the Pro Category the 302 had a place to run.
This class started out as y 80 Novice claimer with a 2 blade. I even think at first there was a time limit how many years you could run the class.

[roperz111]

If you mean by "this class" OSY-400 then my position stands, I don't see how can interpret the rules page any differently. The 302 was NOT a legal motor in the PRO category in 1994. Period. It was ONLY run in the C2H class.

Anyway, this is a silly argument and I've presented evidence, where's yours?

[KG4]

Thanks for the info on the OSY class.I was watching a recent video of the class and fell in love with Billy Allens boat.Anyone know what make of boat he has?It is a lay down style hydro.Thanks again guys,I really appreciate it.