7015/3 prop on Blackjack 55?
10-07-2008, 05:37 PM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: rcboateric
Don't worry about that friction if you're using the synthetice grease, I have a shaft that has been using almost 2 years in my boat and it still looks like new.
Don't worry about that friction if you're using the synthetice grease, I have a shaft that has been using almost 2 years in my boat and it still looks like new.
I am tempted to just do a mod motor and let it power through, but this hull sucks for high speed stuff and isn't worth it and I don't want to build ANOTHER boat right now lol- I have plenty, so I am torn. Like I said, I didn't want this to snowball into a project either- the boat just isn't worth the time or money. I'll get it situated one way or another. Thanks again for all your help!
Joe
10-07-2008, 06:17 PM
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RE: 7015/3 prop on Blackjack 55?
No problem Joe, I know your 55" cat is running for fun, it's a kind of a wave jumper, if you're looking for the speed, a rigger or a small size cat is the way to go.
10-07-2008, 06:31 PM
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RE: 7015/3 prop on Blackjack 55?
I am actually looking at that Chinese 42" mono with a Zen for going faster- don't know if you've seen them or not. The hulls are decent for the price and it is a real Zen, so the potential is there.
At least you understand the purpose of this boat. It really isn't worth putting much time or money into! If I wanted faster, I would have bought a more serious boat. Lol- "wave jumping" doesn't even begin to describe it! You gotta see some of the waters I've run this thing in!!!
At least you understand the purpose of this boat. It really isn't worth putting much time or money into! If I wanted faster, I would have bought a more serious boat. Lol- "wave jumping" doesn't even begin to describe it! You gotta see some of the waters I've run this thing in!!!
10-08-2008, 11:16 AM
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RE: 7015/3 prop on Blackjack 55?
I guess that you are talking about this 41" mono, 90km/h, that is pretty fast for a mono hull that is powered by a stock 260.
http://cgi.ebay.com/41-deep-vee-with...742.m153.l1262
http://cgi.ebay.com/41-deep-vee-with...742.m153.l1262
10-08-2008, 12:37 PM
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RE: 7015/3 prop on Blackjack 55?
That's the one. I don't know how accurate the speed claim is, but the boat is pretty nice for the price. I bought one of his 32" electrics and the quality is very nice for the price. Not quite on par with some of the higher quality stuff but just as functional for a hell of a lot less.
I figure a 41" mono with a Zen 260 would have to move out decently though, then I can mod it from there
.
I figure a 41" mono with a Zen 260 would have to move out decently though, then I can mod it from there
.
10-09-2008, 03:01 PM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: Lunatik Engineering
I put a Voodoo 7016-3 on mine and with a slight chop the boat hauls a**!!
On flat water the stock motor wont pull it.
I put a Voodoo 7016-3 on mine and with a slight chop the boat hauls a**!!
On flat water the stock motor wont pull it.
10-09-2008, 05:23 PM
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RE: 7015/3 prop on Blackjack 55?
Would the fact that Lunatik is running a different pipe other than stock make the boat to pull that prop? It's a question I've been wondering since I just ordered a couple new props to play with, and have been thinking of replacing the stock pipe. I almost ordered the 7015/3 before I read this post. Will wait and see what you come up with before I pull the trigger on that one.
10-09-2008, 09:47 PM
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RE: 7015/3 prop on Blackjack 55?
It may. Chris (dasboata) is convinced there is something wrong with my boat if it can't pull that prop, but I'm not the only one who couldn't get it to pull a prop this size. I'm stumped. I just ordered a back cut X472 from him to try, so I'll compare the two and see what happens. I know I have my strut as high as physically possible without removing the stuffing box and moving it up some, so I can't see there being much tweaking left to get it to work. I have tried going as long as I can with the pipe before the o-ring pops out raising/lowering the strut, angling the strut up and down, richening it, leaning it, etc. and it just won't pull the R's with this prop.
10-09-2008, 10:00 PM
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RE: 7015/3 prop on Blackjack 55?
Not sure what setup your running, but could you gain enough RPM to spin that prop by running without a clutch? I'm pretty new and still trying to learn the setup and use of diffrent props myself so I won't be much help. Just throwing out ideas!
10-09-2008, 10:02 PM
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RE: 7015/3 prop on Blackjack 55?
I am actually discussing that with someone else as we speak. I don't 100% know the answer yet, but I don't want to give up my clutch just to do so either. Not for the use this boat sees 
.
.
10-09-2008, 10:06 PM
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RE: 7015/3 prop on Blackjack 55?
I ordered a 275 and x572 which I'm hoping to be here before the weekend. After reading countless times that the bj55 hull has it's limits and the fact that the only mod I plan on doing is a pipe, I couldn't really justify the money on either a voodoo or dasboata prop. Didn't feel I would get my money's worth out of those props with this boat. If you prove me wrong, then I'll spend the money on a better prop.
10-09-2008, 10:10 PM
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RE: 7015/3 prop on Blackjack 55?
I have the clutchless adapter on order as well. Unfortunately, I don't have any tach device to compare with or without. I was wanting to keep the clutch as well but figured for the price of the adapter I'll give it a try.
10-09-2008, 10:57 PM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: illiniboater
I have the clutchless adapter on order as well. Unfortunately, I don't have any tach device to compare with or without. I was wanting to keep the clutch as well but figured for the price of the adapter I'll give it a try.
I have the clutchless adapter on order as well. Unfortunately, I don't have any tach device to compare with or without. I was wanting to keep the clutch as well but figured for the price of the adapter I'll give it a try.
http://s302.photobucket.com/albums/n...nt=Movie_2.flv
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10-09-2008, 11:18 PM
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RE: 7015/3 prop on Blackjack 55?
My clutchless adapter will be here before i pick up a gps on ebay. I'm not patient enough to wait for the gps arrives before i take out the clutch or start playing with the diffrent pipes.
Not to change the subject but I have not changed the pipe length yet. Is there a noticable differance by adjusting it?
Not to change the subject but I have not changed the pipe length yet. Is there a noticable differance by adjusting it?
10-09-2008, 11:32 PM
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RE: 7015/3 prop on Blackjack 55?
the best length is 11-1/2" to 12", measure it from the center of the flange straight back to the center of the band, if the pipe is too short, the engine would lose some torque, if the pipe is too long, the engine'd lose some RPM. Running with or without a clutch, the speed difference would be at least 10%.
10-10-2008, 05:19 AM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: illiniboater
My clutchless adapter will be here before i pick up a gps on ebay. I'm not patient enough to wait for the gps arrives before i take out the clutch or start playing with the diffrent pipes.
Not to change the subject but I have not changed the pipe length yet. Is there a noticable differance by adjusting it?
My clutchless adapter will be here before i pick up a gps on ebay. I'm not patient enough to wait for the gps arrives before i take out the clutch or start playing with the diffrent pipes.
Not to change the subject but I have not changed the pipe length yet. Is there a noticable differance by adjusting it?
Yes is the simple answer - the difference is huge. The pipe (I'm assuming you are talking about a tuned pipe here) needs to be tuned to the engine to produce maximum power at the revs that you want to operate at.
It is a compromise though to get the best performance, as Eric touched on, typically, too short will make for power high up the rev range, but will loose low end power, which you will notice through turns as the engine revs drop with the increased loading on the motor, too long and the pipe won't be tuned corrrectly for max power and RPM where you want it down the straight bits.
So you adjust it to make the best compromise you can really.
Then of course, if you change a prop., the engine revs change and you then have to go through it all again to get the best length. It is all fun though!!
Back to the subjcet at hand though, I run one of these props but on a mono hull, it is good because it does not produce much lift and as result it runs really stable, but, you do need to have it high. Mine is around 12mm up the transom.
I am not convinced a clutch will alter your revs at all, unless it is slipping in which case it will alter the revs the prop soins at. It might reduce the engines pick up speed as the engine has to also spin up the additional inertia of the clutch parts as well as everything else.
Glenn
10-10-2008, 08:10 AM
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RE: 7015/3 prop on Blackjack 55?
Sorry Glenn,the clutch removal made a large impact on jacks boat,it seemed to run stronger with better revs,it felt more positive in bite too.Definately a worthy increase for him.
Brod..
Brod..
10-10-2008, 08:39 AM
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RE: 7015/3 prop on Blackjack 55?
I'm going to adjust my pipe length this weekend and hopefully the props and adapter show up today or tomorrow so I can try them out as well. Should be a fun weekend!!!
I have a feeling I am going to see a noticable change without the clutch. I still have the stock pro boat clutch in mine and I have a feeling it is slippping on me.
I have a feeling I am going to see a noticable change without the clutch. I still have the stock pro boat clutch in mine and I have a feeling it is slippping on me.
10-10-2008, 09:11 AM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: glennb2006
Yes is the simple answer - the difference is huge. The pipe (I'm assuming you are talking about a tuned pipe here) needs to be tuned to the engine to produce maximum power at the revs that you want to operate at.
It is a compromise though to get the best performance, as Eric touched on, typically, too short will make for power high up the rev range, but will loose low end power, which you will notice through turns as the engine revs drop with the increased loading on the motor, too long and the pipe won't be tuned corrrectly for max power and RPM where you want it down the straight bits.
So you adjust it to make the best compromise you can really.
Then of course, if you change a prop., the engine revs change and you then have to go through it all again to get the best length. It is all fun though!!
Back to the subjcet at hand though, I run one of these props but on a mono hull, it is good because it does not produce much lift and as result it runs really stable, but, you do need to have it high. Mine is around 12mm up the transom.
I am not convinced a clutch will alter your revs at all, unless it is slipping in which case it will alter the revs the prop soins at. It might reduce the engines pick up speed as the engine has to also spin up the additional inertia of the clutch parts as well as everything else.
Glenn
Yes is the simple answer - the difference is huge. The pipe (I'm assuming you are talking about a tuned pipe here) needs to be tuned to the engine to produce maximum power at the revs that you want to operate at.
It is a compromise though to get the best performance, as Eric touched on, typically, too short will make for power high up the rev range, but will loose low end power, which you will notice through turns as the engine revs drop with the increased loading on the motor, too long and the pipe won't be tuned corrrectly for max power and RPM where you want it down the straight bits.
So you adjust it to make the best compromise you can really.
Then of course, if you change a prop., the engine revs change and you then have to go through it all again to get the best length. It is all fun though!!
Back to the subjcet at hand though, I run one of these props but on a mono hull, it is good because it does not produce much lift and as result it runs really stable, but, you do need to have it high. Mine is around 12mm up the transom.
I am not convinced a clutch will alter your revs at all, unless it is slipping in which case it will alter the revs the prop soins at. It might reduce the engines pick up speed as the engine has to also spin up the additional inertia of the clutch parts as well as everything else.
Glenn
Joe
10-10-2008, 09:37 AM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: brodjack
Sorry Glenn,the clutch removal made a large impact on jacks boat,it seemed to run stronger with better revs,it felt more positive in bite too.Definately a worthy increase for him.
Brod..
Sorry Glenn,the clutch removal made a large impact on jacks boat,it seemed to run stronger with better revs,it felt more positive in bite too.Definately a worthy increase for him.
Brod..
No need to be sorry Brod. It's a discussion forum and this is discussion, I just can not understand how a clutch can slow a boat. Obviously there is weight there, as well as inertia, but once spinning at full revs, the inertia should not affect anything.
Anyone got any ideas? Am I missing something here?
Glenn
10-10-2008, 09:40 AM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: kwiktsi
Thanks Glenn. I have the prop up about 8mm now and it is cavitating on the launch. I can go higher, but don't want to lose bite on the bottom end. Also, to go higher will require me to remove my stuffing tube and raise it's exit point from the hull- really not worth the hassle just to make it a little faster! Where the prop is right now, the top blade will be about 1.5mm out of the water when sitting flat in smooth water. Don't know how much higher is acceptable before I start loosing bite and speed. Chris is sending me a back cut X472 for it, so I'll give that a shot. I ended up buying it outright though, no return, so that I have both to play with when I have time.
Joe
ORIGINAL: glennb2006
Yes is the simple answer - the difference is huge. The pipe (I'm assuming you are talking about a tuned pipe here) needs to be tuned to the engine to produce maximum power at the revs that you want to operate at.
It is a compromise though to get the best performance, as Eric touched on, typically, too short will make for power high up the rev range, but will loose low end power, which you will notice through turns as the engine revs drop with the increased loading on the motor, too long and the pipe won't be tuned corrrectly for max power and RPM where you want it down the straight bits.
So you adjust it to make the best compromise you can really.
Then of course, if you change a prop., the engine revs change and you then have to go through it all again to get the best length. It is all fun though!!
Back to the subjcet at hand though, I run one of these props but on a mono hull, it is good because it does not produce much lift and as result it runs really stable, but, you do need to have it high. Mine is around 12mm up the transom.
I am not convinced a clutch will alter your revs at all, unless it is slipping in which case it will alter the revs the prop soins at. It might reduce the engines pick up speed as the engine has to also spin up the additional inertia of the clutch parts as well as everything else.
Glenn
Yes is the simple answer - the difference is huge. The pipe (I'm assuming you are talking about a tuned pipe here) needs to be tuned to the engine to produce maximum power at the revs that you want to operate at.
It is a compromise though to get the best performance, as Eric touched on, typically, too short will make for power high up the rev range, but will loose low end power, which you will notice through turns as the engine revs drop with the increased loading on the motor, too long and the pipe won't be tuned corrrectly for max power and RPM where you want it down the straight bits.
So you adjust it to make the best compromise you can really.
Then of course, if you change a prop., the engine revs change and you then have to go through it all again to get the best length. It is all fun though!!
Back to the subjcet at hand though, I run one of these props but on a mono hull, it is good because it does not produce much lift and as result it runs really stable, but, you do need to have it high. Mine is around 12mm up the transom.
I am not convinced a clutch will alter your revs at all, unless it is slipping in which case it will alter the revs the prop soins at. It might reduce the engines pick up speed as the engine has to also spin up the additional inertia of the clutch parts as well as everything else.
Glenn
Joe
Chances are it can go a lot higher, depending on how you are launching, and I suspect I know with you running a clutch, you will find most props are going to cavitate until the boat starts to move.
I throw mine in to get them going.
Glenn
10-10-2008, 10:11 AM
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RE: 7015/3 prop on Blackjack 55?
Glenn, It's a fact that many or maybe all clutches will cause a power loss because the clutch systems are somewhat agricultural in their design. Misalignments such as between the crankshaft and clutch shaft and between the clutch drum and the pivot points or centres of the clutch shoes will all be a problem.
10-10-2008, 03:57 PM
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RE: 7015/3 prop on Blackjack 55?
ORIGINAL: kwiktsi
Where the prop is right now, the top blade will be about 1.5mm out of the water when sitting flat in smooth water.
Joe
Where the prop is right now, the top blade will be about 1.5mm out of the water when sitting flat in smooth water.
Joe
10-10-2008, 05:01 PM
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RE: 7015/3 prop on Blackjack 55?
another cheap little upgrade you can do is remove the head gasket to lower the squish and add a little compression. i put one of carlos's .002" soft copper gaskets in. i know some people that take it out and just use ultra copper rtv to seal it. i use the soft copper because i don't have a torque wrench and am afraid it will leak. i'm not sure what kind of gain it gives because i changed it before i had my gps.