Am I crazy does this seem right????
 

Ok just for sh^ts I was playing around with the prop slip calc.. I am spinning a 30p b1 prop to about 5300(will say 5250) on the rev box sometimes, with a 1.82 gear. Can't remember exactly from last year, but the gps numbers were in around 77-80 mph... I am getting 0 for a answer to prop slip, 82mph for the speed http://www.go-fast.com/Prop_Slip_Calculator.htm What the hell is going on here, 0 slip is impossible. I am not lying about it(numbers) so whats going on..

Thanks

John jr

Are you sure that you have a 1.82 gear? 0% slip is highly unlikely.

I just run your numbers in my pocket japanese calculator and you are right ,there,s 82,4 mph theoretical speed ,are you sure you don,t have a 1,50 ratio ,and run about 15-16 % slip ?? seems a lot of slip though ,but possible, I guess
Maybe the formal owner /dealer anyone changed the drive /lower so the ratio is not anymore whats written on the drive ,if you want to be sure about the ratio ,just turn the engine over at the pully (sparkplugs out turns easier) and put some masking tape on the prop and lower unit and mark both ,then turn the crankshaft at the pully and see how much more than one revolution you have to turn the crank to make one revolution at the propellor.

It could also be that the tach is off ,or the prop is modified to a 32 P

Good luck

A.J

I am positive it is a alpha 1 1.82-83(stamped on the drive), for sure a 30p prop. We put the drive on and the new engine in the boat (efi sbc) I took one of the tachs out of the fountain to see last year, it is right on... Weird huh."" ?? I am going to try a labbed 32 B1 on it to see if it will gain mph, like stated it will bump the rev box now... I just can't seem to figure out the 0 slip, it isn't possible.. Maybe i am retarded and am not doing the calc correct.. hmmmm
FIG IT OUT I THINK, when I put in my gps speed where it says actual speed, then calculate my thero speed I am getting 4-6% slip.. But that is LOW also Is this correct??
John jr

T T T for the nigh owls... Somebody has to know what the F^&K is going on.. Is the 6 % slip possible??

John jr

This must be on the Stinger. Yes, it's very possible your slip is at 6%. I ran as low as 5% slip on my old Baja 196 with a Mirage Plus. At speed, not much boat was in the water. However, the boat actually ran a little faster with a labbed prop and about 8% slip.

Now, my Sonic is double that at 16%.

Yesir it is on the stinger.. So on a smaller boat the slip is often less. Also there might be 2-3 foot of the v in the water when balls out.. I am hoping it will spin the labbed 32 to 5k, but the labbed 32 should spin about the same as the standard 30... Thanks this makes me feel a lil less crazy..

John jr

Throttle up- B Blades, any input (if ou catch this thread)???


Thanks

john jr

I find it pretty hard to believe you are running 80mph with a 350hp smallblock.I know my boat with a stock 260 through a 1.5 to 1 drive runs 60 and it is a very effecient hull.

I can't imagine another 90 horse would push it another 20 mph faster

Are you using a gps or a speedo

GPS as always :)


John jr

Yah neither can alot of other people, but i assure you it does, once I get it in from the seat refab I will get you some vids of it.. It is a solid 77 mph, I have no reason to lie or bull**** about it, cause this has me kinda baffled, I wouldn't defend a point or try to figure this out if it was a lie :)..The boat only weights about 1875 with me in it... The motor was supposed to be a STOCK 1997-98 350 efi motor. It had a ASM tune when we got it, I added emi thunder exhaust.. So to be honest the thing might have a cam in it, but the previous owner of it said it was stock other then pcm tune.. None the less it screams. With the current gearing it will spin the 30 bravo to redline, if I knew of a number or hp formula to plug numbers in I would know about the real hp... Also the stinger is alot wider, flatter across the back and doesn't have as deep of a vee on it as your boat does, so i think it would make for a faster hull, also has a pad..

John jr

1875 lbs would be almost impossible in a 22 foot boat unless it was a flat bottom river boat.My boat weighs 2600 and it is a very minimalistic interior and rig job.

If you were 1875 minus 900 for the engine package that would leave you 975lbs minus 50 for the battery and another 75 for the fuel tank and than 100lbs worth of interior than you would only be left with 750lbs .

Now i assume you weigh in at least 150 lbs that would leave 600 pounds of glass.

My boat runs on the last foot of its rounded v at 60. I used to run with padded bottom 21 scarabs that ran the same speed with the same 260 package.

Heck my old 19 with a stroker small block and an Arneson drive is only in the mid 70s for speed.

I think you need to borrow somebody elses GPS.

http://www.iboats.com/Chris_Craft__2.../bp/63b19736r2

http://www.youtube.com/watch?v=E_wyvOUqrn0

This was with the 28 pitch, had to stay out of it some to keep it off the box, spinning a 30p now with different(higher gears) still on the box... So that means it picked up mph,, That run there was well into the 73-4mph range on gps as I recall... The boat is 20ft, I come in at about 215lbs

1500lbs dry, I will go out and say 1950lbs.. There was over 110 lbs of sand foamed in from the factory, that was removed. I run on the last foot also. My GPS is just as accurate as anybody else's. I would hope your boat could run with a 21 scarab considering it is 19ft, doesn't weigh as much... i don't know what to tell you. I am not trying to start a pissing war here.. This is facts. I have came up with 6% slip, the boat goes without a doubt 77mph or better... I am sorry if you stroker boat isn't running better then 70. This boat went 50 gps with the v 6 in it.. Again the v on this thing is no where near the degree of yours, I am wider then you and have a pad...Might want to check your facts on what is up on the stingers(202) It is a 3 man seat thats it, no cabin no back seats...

http://i6.photobucket.com/albums/y21...5/IMG_0579.jpg

John jr

Nice looking old Stinger for sure

.But i still highly doubt 1500 or 1900 lbs dry. That would still only leave 500 to a 1000 lbs for hull and rigging after you back the motor package weight out at 900lbs .Maybe 1500lbs for just the hull minus motor package which would place you back at 2400lbs with the package added back in which sounds about right.

These boats were not balsa cored carbon fiber lite weights.

77-80mph is about another 100 to 150 horse from 73-74mph.

Did you raise the x dimension on it and what kind of power do you think you are getting out of you engine?

Just curious because i would never dream that the stinger would be such a fast and efficient bottom.I know it is not a real deep v and has a pad but just find it hard to believe the speeds you are saying and the slip ratios agree with it.

I brought up running with the old paddd bottm 21 Scarabs as a reference that the padded bottom did very little to add to the overall speed over my convential rounded v bottm i have.
i

So what speed do you think that it should be running?? There is the weight of it right there in that link. Where are you getting 900 for the engine, a small block with a cast iron intake is about 600lbs this has a aluminum intake and aluminum manifolds.. And the sand that was removed out of it 100+ lbs there...So I am prob in about the same weight give or take 60lbs from the 6 banger And your saying I need another 100 hp to get 3-4 mph, your crazy, a prop change will do it if you can turn it, this thing can swing the 30 no problem(@ 77+mph).. My buddy has a heavy ass 24ft chap villian 3 and runs 57-58 on gps, with a huge deep v, with a 23p mirage prop threw a bravo1 1.5 gears.. And stock ass 330 hp bbc... I have walked on a 22 velocity with a decent motor( BBC400-10 hp)-Bravo drive. So that would mean he wasn't running 70 with that?? .. Also a few 28 formulas with twins, a 18 donzi with a healthy engine in it.. We didn't touch anything on the boat as far as bottom or x.. Again i don't have a clue what kinda power its making, but app more then we thought.. How much can it make its a efi small block with a tune and decent exhaust... Julie at throttle up is the one who rec the prop pitch(28) we are running, said it would be the one with the orig 1.98 gears... Well it was close but wasn't it, so app it is making more hp then we had told her which i believe was 350.. Not only that we have since dropped to a higher gear, are spinning a bigger pitch prop again to the redline... Believe it, it is fast, runs every bit of what I am saying it does. I don't bull****, the prop slip calc is matching what im saying.. I just asked if it was possible to have that minimal slip. Like I said I will show you it on a gps when I splash it in the water, you can buy me lunch....

John jr

I'm familiar with those Chris Crafts. That model boat with a closed in transom and a V-8 3.6 liter Evinrude 300HP stock runs 83 MPH. That's 15 years ago with 15 year old prop technology. Granted, the outboard and the 24 inch B-bracket weighed approx 550 LBS + 65 LBS. This speed was attained with 2 180 LB men on board and 30 gals of fuel. On the trailer, rigged less engine you could lift the bow of the boat over your head. It has a large flat pad and is a semi-V. I beleive the boat runs just as stated. You can't even compare a scarab to this boat. YOU WILL get smoked clean out of sight.

Thank you :drink:

John jr

I clicked on the 1988 202 specs and it showed the weight at 2300lbs dry,I think the 1987 at 1500 lbs is a little low once you factor in drive ,gimbal ,motor and rigging plus why is the 87 800 lbs lighter other than just a error in info. In comparison my buddies boat that was a actual 600-700 lb hull minus rigging,motor etc was a potato chip (1978 southwind drag tunnel). The sunlight would shine right thru the fibreglass it was so thin and you didn't dare walk on the bow at all as it would crack or collapse. Everytime you drove it you had to patch something back together as it was fragile.
AS far as does your boat run 77-80 mph,I believe it could and am not calling you a liar or anything,I just wanted to put the weight thing in perspective,Smitty

So kight that you can pick the boat up over your head on the trailer. Yea maybe if the stern is hanging off the trailer bunks 6 feet.

If the boat was truly built that light with the old mat and roving materials from back in those days. The layup would have to consist of one skin coat of mat and just one layer of roving and call it done.
And i am quite sure the Chris Craft workers were not using as little resin as was needed for wet out.

As far as the engine pacgage weight here is the specs for a 305 package deduct 100 lbs for your weight savings with the alumnuim intake and manifolds puts you at 846lbs for the package.

83 mph from a 300hp outboard is possible . Your talking a whole different animal with a Raised X dimension and a 450lb weight savings.

But 15 years ago was that 83 on a speedo or a radar pass.

Also your claim of a solid 80 mph is a long ways from 72-73mph.I can see low 70s if the engine is making 325 hp.which i think with the exhaust and cam modifications is about there.






Specifications
HP: 220
kW: 164
Displacement Liter/CID: 5.0/305
Cylinder/Configuration: V-8
Bore & Stroke (in): 3.74 x 3.48
Bore & Stroke (mm): 95 x 88
Compression Ratio: 9.4:1
Fuel System: 2V Carb
Full Throttle RPM Range: 4400-4800
Ignition System: Thunderbolt V
Alternator Amp: 65
Alternator Watt: 917
Length (in/mm): 32/813
Width (in/mm): 30/740
Height (in/mm): 22/559
Drive Options: Alpha, Bravo One, Bravo Two, Bravo Three
Total Weight (lbs./kg): Alpha : 946/430

Tommy!!!! These boats where chopper gun with a little mat over the stringers,as were the southwind drag hulls.I can see by the way this is going,except for the fact of you riding in this you will never believe it.Their is also a GOD just don't wait to see him believe it.


80 mph John

Chopper gun doesn't necessarly mean a light boat it just means a weak boat. And mat and chop are the same material.

None the less it is a well preserverd cool little ride.

Tommy! when I put the gps telltail gps speedo in and a camera guy I will post to you. Peace it's all good JOHN

Deal.

By the way here is a sweet little 20 Cigarette running 80 mph at 5200rpms from a 700 horse big block.

http://www.vimeo.com/4374769

Once again two diff style boats, huge v vs a semi v pad. BBC more weight... The cig is laid up much heaverier..Man I feel like im in school again lol.. I will just let ya see the vid of it on gps when I get it...


John jr

Newer pad bottom on the Ciggie. 85 top end at 5400 out of 700 horse and a ton of big block torque.

Anyway, I will get ya that vid, so you can be owned :lolhit::angry-smiley-038: Also there is another 20 cig that runs 101 or 102 with that kinda power, but i guess that guy is full of it too..

John jr

Didn't say you were full of it . Just commenting on how remarkably light and fast your boat is with a stock x dimension and basically stock efi motor.

I THINK A small block with alpha drive is lighter than 900. I thought the big block bravo drive set up was 1000lbs.

the new sutphens 21 does that with a 496ho:evilb: its sad that it takes 700hp to move a 20cig to 85. its a nice looking boat, I have seen the 27 cig sq do 74 with 500hp. maybe they have there drive deep.

Not to start a bunch of ****-(but the truth) just gps'd my buddys 1988 chap villan III 24 with a bravo drive and 400 hp bbc 23p Qsilver prop, 3 guys, myself 220 my friend 230 and the owner 260, with a cooler full of beer-ice 30 pack, a 80lb ac unit we ran 61.7. Mind you it has a cuddy, porta pot, cockpit for 5 people full windsheild, interior, anchor, ropes, bumpers, two batteries... He weights a **** load more then me. I guessing a labbed prop, lose the extra weight, with just me and him we could get a easy 65mph out of it. I could walk right by him with out a problem.... The vid will be up soon, once my seats come back from the seat man, along with my gps numbers to back my (socalled talk up) Who knows maybe I will add a few mph to my talk :) And to the guy with the cig, very nice ride he has, but I would expect better then that with that kinda hp.. It would be a shame if i could walk a 700 hp boat with a basically STOCK motor... \


John jr

Amen!

Not to weigh in on what seems to be a done and dusted event but substantiating evidence helps.

According to Chris Craft, the 222 weighs in at 2190Lbs dry.
Take off around 300-400lbs of cabin, seats, ballast and crap for the 202.
According to my maths, an incjected SBC weighs ~575lbs, add around 80lbs for exhaust (total) and another 150lbs for old mate Alpha hanging on the back and you've got aroud 2600lbs of boat. Add fuel and driver, you're still not that heavy.

Now, the SBC EFI will rev like a bastard to 6000 rpm if you let it, meaning at 5300-5500rpm it's making full go noise hp. (unlike most 'stock' BBCs). Again, keep in mind that the Stinger is lighter, flatter, padded and wider. It will be faster than a cigarrette of the lame length. (Sorry).

I know, because my 222 went 67mph (GPS) with a 330hp 454 mag and an Alpha swinging a 30 on 1.82s, and it weighs alot more.

Now I also know that my 222 running 550hp, a 1.5 B1 and a 25P Mirage + will push 85mph happily. I know nothing about slip or math, I know reality. My last boat went about 105mph on ~420hp and it was a flat bottom v-drive with a 2 blade and bad attitude. That was scary but again not inconceivable. If the 202 is running at 5-6% slip and that is acceptable, good on him. I'm anxiously awaiting how fast it'll go next with what he's got coming!

LONG LIVE THE STINGERS!