racing prop for mercury 1" 15 spline

[53w]

looking for RH racing propeller 2 or 3 blade with about a 15 to 17 inch pitch and about 9 to 10" diameter round ear propeller for large ssm with 1" propshaft and 15 spline
thanks
53w

[Ron Hill]

The prop size you are asking for sounds like a Super Speedmaster and they are 14 spline.

[Mark75H]

If it is 1" and 15 spline, it is a BP speedmaster. They usually use props bigger than 10" diameter. I think 15 inch pitch will also be hard to find for a BP.

[53w]

it is not a BP speedmaster. It is nonshiftable with a 1" 15 spline propshaft. It is a early I-O speedmaster that also fits on a inline 6 cyl outboard tower. It is geared almost 1-1 not sure on exact ratio.
I am going to use it on a shooting star with a inline 6 merc
I am thinking I need about a 15 pitch 9.5" dia prop. I will take anything from 14 to17 pitch and 9 to 10.5 inch in dia. Just need something to get started with that fits on the prop shaft that is close.
I also need the splined thrust washer the the prop goes up against.
53w

[Mark75H]

The MC-1 Speedmaster. I was not aware of the prop size on them, I thought it was the same as the SSM; apparently it is the same as the BP

[53w]

If I cant find a prop for this. could I take a ssm prop of correct size and wire edm the spline out to fit the 1 by 15 spline shaft?

[Mark75H]

I do not know how that would affect the hardness of the steel in the spline area. I would not risk a propshaft finding out.

[Bruster]

It won't. The heat effected zone is less than .001"

I do not know how that would affect the hardness of the steel in the spline area. I would not risk a propshaft finding out.

[Bruster]

There are 2 guys (at least) on S&F who run Shooting stars with SSM's. You need to pick some brains about what works and what dosen't. Ask about gear ratio H.P., engine height, max rpm, max speed, pitch & diameter etc. I think with that info in hand you could make a single shot at making or finding the right propeller. The range you are looking at to start with "14 to17 pitch and 9 to 10.5 inch in dia" covers pretty much the entire spectrum for an decent inline with a SSM. :D

it is not a BP speedmaster. It is nonshiftable with a 1" 15 spline propshaft. It is a early I-O speedmaster that also fits on a inline 6 cyl outboard tower. It is geared almost 1-1 not sure on exact ratio.
I am going to use it on a shooting star with a inline 6 merc
I am thinking I need about a 15 pitch 9.5" dia prop. I will take anything from 14 to17 pitch and 9 to 10.5 inch in dia. Just need something to get started with that fits on the prop shaft that is close.
I also need the splined thrust washer the the prop goes up against.
53w

[Ron Hill]

I'd like to see the gearcase....any pictures...

[53w]

ssm and mc-1
35479

35480

[Mark75H]

You've tried a SSM prop on it and it doesn't fit?

Why aren't you using the SSM on the 'Star?

[53w]

sorry the photo is not very clear the mc-1 shaft is larger in dia. The threaded dia on the mc-1 propshaft will not even fit in ssm prop. I am building a 2nd engine and thinking the I/O speedmaster is more durable. I didn't think that a prop to fit it would be that hard to find.

[Bruster]

I'm thinking...

Is the propshaft the same as a standard inline propshaft? I also think these lowers used a bigger diameter propeller- 13 or 14"? I have a propeller that was supposed to have came from one of these, it is 13" diameter X 26.5" pitch. (Look at the picture on the left.) There was probably reduction was in the upper gear set to get all this pitch working. This could be an issue when this is coupled directly to the motor. However.... A #6 Speedmaster prop might just fit, or you might be able to make it fit. Something along the lines of a 10" X 15" would get you started with the SSM. I'm thinking a 10" might be small for the MC-1 as the diameter is bigger than the SSM. Your old inline SSM would be a lot easier and probably faster.

[53w]

Any one ever run a cleaver on a glass shooting star and have it drive correctly? Bob Switzer told me to use round ear props. 17" for 1 person, 15" for 2 or more people.
A low rake cleaver will push the rear of the boat up and a high cleaver rake will lift the nose. On a shooting star you want the air to lift the boat not the prop?
I am just going with what Bob told me to use.
I have not been able to drive the boat yet. It came with a 1966 1100ss (points thunderbolt cd) with ssm and 17inch merc round ear 2 blade. The engine and boat have been sitting for over 25 years both need some work. The engine needs a lot of work and has no spark, I think the box is bad. So I figured it would be easier to build 1250Bp fake with a newer 6 cyl power head hiding under the 1250BP shroud.
I was given a ssm BP adaptor and mc-1 by my cousin. I am using them on a T2 tower. I have a good complete set of 1250 pans and sheetmetal and need to get 1250BP stickers. Made a drive shaft extention. All I need is a powerhead and prop or use my ssm. I just think the mc-1 would look more closer to the shifting BP case. I dont have to run the mc-1, just if i can prop it i would use it.
thanks for all the info so far
53w

[Skoontz]

Any one ever run a cleaver on a glass shooting star and have it drive correctly? Bob Switzer told me to use round ear props. 17" for 1 person, 15" for 2 or more people.
A low rake cleaver will push the rear of the boat up and a high cleaver rake will lift the nose. On a shooting star you want the air to lift the boat not the prop?
I am just going with what Bob told me to use.
I have not been able to drive the boat yet. It came with a 1966 1100ss (points thunderbolt cd) with ssm and 17inch merc round ear 2 blade. The engine and boat have been sitting for over 25 years both need some work. The engine needs a lot of work and has no spark, I think the box is bad. So I figured it would be easier to build 1250Bp fake with a newer 6 cyl power head hiding under the 1250BP shroud.
I was given a ssm BP adaptor and mc-1 by my cousin. I am using them on a T2 tower. I have a good complete set of 1250 pans and sheetmetal and need to get 1250BP stickers. Made a drive shaft extention. All I need is a powerhead and prop or use my ssm. I just think the mc-1 would look more closer to the shifting BP case. I dont have to run the mc-1, just if i can prop it i would use it.
thanks for all the info so far
53w


Call John Janaky, 262-534-4440, DAH ProPeller. He had a 150 Merc on his shooting start before he ran the Kilo record with the V-6 OMC. I kno whe worked with Bobby and Dave Switzer for a while to get the boat to handle correctly. Maybe he can shed some insight.

[53w]

I sent the Box in to be checked. One set of points was bad, the other was working. I should of had spark on 3 of the 6 cyl and didn't have any. So i think the box is bad. The 1100 needs a complete resto, so I am going to hang it on the rack and finish the newer engine too run on the star.

[Mark75H]

Found this that confirms what I was thinking and others guessed as well ... apparently there was more than one propshaft on the MC-1 ... this says props are interchangeable between the regular SSM and MC-1

http://i256.photobucket.com/albums/hh194/mark75h/Untitled-3.jpg


I bet the big shaft was for offshore racing

[Bruster]

I bet the big shaft was for the I/O's boats running 13" diameter props. The MC-1 is an I/O lower unit. The outboard version was the I-SSM. Could very well be propshafts will interchange, if you could ever find one.

[Bruster]

Sam has the SSM prop that will likely get you started in the right direction, depending on how much power you will have.

http://forums.screamandfly.com/forums/showthread.php?threadid=201716

Bob Switzer told me to use round ear props. 17" for 1 person, 15" for 2 or more people.


53w

[53w]

does any one have a parts manual that lists the part numbers for the 2 dif propshafts?
53w

[Mark75H]

That is one of the few parts lists I have never seen ... along with the silo Twister and dash one that it was optional on.


If someone has them and can do high resolution scans, that would be great

[Mark75H]

This just in from folks at Screamandfly ... props for new Type VI SSM fit this shaft (along with the BP SSM props, but I don't think I recall seeing an appropriate sized prop in the BP series)


http://i256.photobucket.com/albums/hh194/mark75h/Merc_81_HP_Page9.jpg

[53w]

I called John Janaky tonight, awsome nice guy! If anyone has any shooting star setup questions he really likes shooting stars and likes to talk about them. He said I could run a low rake cleaver with no problem with the right rake angle, thats what he used to set the kilo record with the omc. I have to call him back to get exact angle i need.
He was thinking I would need 15 to 17 pitch depending on what HP I come up with. He thinks that someone did make some RH LR cleavers with the 1" 15 spline in that size of prop.
I am for now going to look for a prop to fit my current propshaft, unless a prop shaft comes up for sale some where.
Thanks for all the help and info
53W

[Bruster]

Is your lower unit a LH or RH rotation? I think we were assuming it was RH.

I was looking at my Mercury Racing propeller guide (1998-99) and they don't have anything listed for the 1" 15 spline in the pitch and diameter you need that is RH rotation. LH rotation Cleavers, 9 X 15 all the way to 10.25 X 21. So if you have a LH GC you just have to look for what you want. A RH GC might be just a little more work...:)

[53w]

Both ssm units are RH. My star has the drivers seat and wheel is on the right side should use RH gear cases on it, because of the propeller torque. My star at one time was set up for kilo runs it has duel bottom fin rails/air traps and raised transom
53w

[Bruster]

I was talking with a guy several years ago who had a Shooting Star. He said he put the air entrapment rails on each side and afterplanes (seems like 6 or 8" long) with a down turn on the outside to match the rails on the boat. Must be this is a common modification with the Star. He claimed the boat would break free from the water sooner and would run a lot faster. :D

Both ssm units are RH. My star has the drivers seat and wheel is on the right side should use RH gear cases on it, because of the propeller torque. My star at one time was set up for kilo runs it has duel bottom fin rails/air traps and raised transom
53w

[53w]

Does any one know who the mercury test drivers where for the merc boat house new letters for the fiber glass shooting star kilo records and are they still around?

[Mark75H]

Do you have a BHB for the glass Star? I can only find the wooden.

If you can post or email, it ... the OFF guys can probably identify the driver.

[Bruster]

Now you know of 3.:D



there were the 2 BHB's with the 1000 and the 1250 that I've ever seen


http://i33.tinypic.com/b89zso.jpg

Nice wood Star with 1500XS

http://i38.tinypic.com/33bj1uq.jpg

[53w]

This is for the one with the 1250bp BHB 68-210-6 . If any one has good copy's of the ones with the 16ft glass star and could post them up. I also would be willing to pay for some perfect copys and be mailed to me so I can have them framed.
thanks
53w