Minnesota Classic Glastron Forum
General Category => General Discussion => Topic started by: OleRed on August 11, 2010, 10:49:59 PM
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I been wanting a nose cone for my drive but have not been able to find one I like for the Gen II, so I thought I'd just make one. I'm not expecting much more speed really ( maybe 1 mph ) but I think it will help make a turn at speed with-out a blow-out, surely it will straighten the water out some before it gets to the prop and give it something more to work with. The original Gen II gearcase is almost blunt. It can't hurt the performance, and I like the look.
BTW ... I can't download the photo thing cause I'm using my wife's lap top since my computer crashed the hard drive, it's like Dial-Up. I appreciate the help inserting the photo's.
http://i273.photobucket.com/albums/jj231/OleReds/NOZECONE002.jpg
http://i273.photobucket.com/albums/jj231/OleReds/NOZECONE008.jpg
http://i273.photobucket.com/albums/jj231/OleReds/NOZECONE012.jpg
(http://i273.photobucket.com/albums/jj231/OleReds/NOZECONE002.jpg)
(http://i273.photobucket.com/albums/jj231/OleReds/NOZECONE008.jpg)
(http://i273.photobucket.com/albums/jj231/OleReds/NOZECONE012.jpg)
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To post your pics from photobucket you just have to click on the photo button (second on the left above the smileys when you input text) and insert your link in between the brackets that appear in the text window.
Sharp looking cone you got there. Manatees watch out!
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To post your pics from photobucket you just have to click on the photo button (second on the left above the smileys when you input text) and insert your link in between the brackets that appear in the text window.
Sharp looking cone you got there. Manatees watch out!
It Worked ... thanks
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Looks awesome Red. Bet it'd play hell on a Manatee though. Not that I have a problem with that ...
I still have the old ('86) gearcase that I twisted the driveshaft out of awhile back. Been dreamin about guttin it & sending it up to Bobs in Tampa for a nosecone & low water pick up job. (Mebbe send it to you instead?) Sadly the way business is lately I'm gonna have to dream on.
Y'know it always cracks me up when people opine, "Well a nosecone's not gonna help ya 'less yer doin X amount of mph." BS! What ... does a nosecone all of a sudden turn into one of those blunt gearcases we're all familiar with under a certain speed?!
All's I have to do is look at a nosecone & I can envision it working for me.
Carry on!
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Red, a Minnesota fellow Randy Pierson, boat racer, modifies nose cones. These pictures show the progress. Supposedly prevents blowouts at speeds over 120 MPH.
http://www.low-h2o.com/testimonial.htm
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Very nice job on that nose cone, yeah stock gear case's don't flow really good and just like Doug said a nose cone by it's looks should flow better than stock.
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The nose cone mod made a 2 mph improvement in my speed, but thats not all, I was able to make several tight turns at 45 mph to 60 mph and it didn't blow out, I Like it !
I tried holding the camara, the wheel, the throttle and trim ... just about too much to do for this ole man, but I did get a video of sort, the video was taken into a 12 / 15 mph wind, little chop, 100 degree's ambient temp, and water temp mid 80's, 26 gallons of gas, 69.2 mph, but on the back flip, down wind the gps indicated 70.2
http://www.youtube.com/watch?v=4XztxaFlVKw
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Red, a Minnesota fellow Randy Pierson, boat racer, modifies nose cones. These pictures show the progress. Supposedly prevents blowouts at speeds over 120 MPH.
http://www.low-h2o.com/testimonial.htm
Thats some Nice work he's doing there, wonder what it cost ? and I wonder about the advantage of the turned down planing plate, thats a new one on me
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Another 2 MPH at your speeds in a boat is huge. Time/money well spent I'd say. The job you did looks excellent BTW!
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A 2 mph improvement when yer already pushin' the envelope is impressive. Nice work Red.
Ya it's interesting how sometimes a headwind don't hurt much and a tailwind don't help much. The average observer would think a boat oughta go a lot faster with a 12-15 mph tailwind. But it ain't always the case.
Yo Red. I'm not seeing what you mean by "turned down planing plate .." Please advise.
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Well Red, looks like you're going to need a camera man!
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Nice work!
Did you just wing it on the dimensions? How did you go about blending it in so nice?
More speed to boot. Just what you needed.
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Yo Red. I'm not seeing what you mean by "turned down planing plate .." Please advise.
Looking at the web site ofthe fellow making those nose mod, he improved the hole shot of a big Honda 4 stroke from 8 seconds to 3 1/2 seconds just by turning the (planeing / cavitation) plate down on the edges, now I'm wondering ? if helped lift the weight of that 4 stroke, of if it would help others .. like Mine ?
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Yo Red. I'm not seeing what you mean by "turned down planing plate .." Please advise.
Looking at the web site ofthe fellow making those nose mod, he improved the hole shot of a big Honda 4 stroke from 8 seconds to 3 1/2 seconds just by turning the (planeing / cavitation) plate down on the edges, now I'm wondering ? if helped lift the weight of that 4 stroke, of if it would help others .. like Mine ?
Can't see how it would hurt ... Reminds me of the side 'fins' on my Bobs true tracker. Funnels the propwash more behind the prop than beside? Plus in my case at least it allowed me to do away with the torque tab on the motor. Never missed it, picked up .8 mph.
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Interesting articles on nosecones:
http://www.bassboatcentral.com/nosecones.htm
http://www.randrpropshop.com/tips.htm
http://www.cpperformance.com/c-744-nose-cones.aspx
http://bobsmachine.com/shootout.shtml
http://www.bwbmag.com/output.cfm?id=979759
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, picked up .8 mph.[/quote]
hmmmm ... those are some interesting articals alright, I'm wondering, but I don't know if I want to modify my drive anymore, but the planeing plate on my Gen II is a little wider than the Alpha's .. Stop Me Doug, I don't have time to do anything else before the meet .. Hold Me Down .. Just say NO !
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Nice work!
Did you just wing it on the dimensions? How did you go about blending it in so nice?
More speed to boot. Just what you needed.
I did zero the point of the cone when it was welded on, but the epoxy was just a look and feel thing, after it was painted I could see it's not perfect, but it worked well enough for me to let it alone for now.
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Red, you seem to have a feel as to what works and what does not without reading all the theory behind something. And you are not afraid to experiment.
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Red, you seem to have a feel as to what works and what does not without reading all the theory behind something. And you are not afraid to experiment.
Hey David ... my Dad called it Bull Headed .. LOL
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I have been called bull headed too, but without your mechanical skills.
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Yo Red. Been meanin' to ask. Did you saw the diffuser off that prop or did it come that way. Reason I ask is I believe Walt sawed one off a Raker, or something similar, and picked up 1/2 mph or so?
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Yo Red. Been meanin' to ask. Did you saw the diffuser off that prop or did it come that way. Reason I ask is I believe Walt sawed one off a Raker, or something similar, and picked up 1/2 mph or so?
no ... the power tech props don't have that, and I never figured how it would benifit us anyway, with thru-hull exhaust, kinda like the "vent holes" in a prop, if ya got through hull exhaust, there is no advantage..
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Yeah I agree a ventilated prop's gotta be pretty much useless on a thru-hull exhaust boat.
Wonder what's the purpose of a diffuser anyway. Looking at the one on my Lightspeed all's I can imagine it creating is drag?
Anybody know?
Wouldya believe I have less steering torque under hard acceleration with the small hub SRX prop than I do with the Lightspeed. And the SRX is 1/4" bigger & a degree taller? Hmm.
Oh well when I get the dang ding in my SRX fixed & get it back on the boat mebbe I'll have the boys saw the diffuser off the Lightspeed. I'm no engineer but I can't see how it could hurt?
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Anybody know?
I'm just guessing, but maybe it's to move a little more water out of the way to help scavenge the exhaust out of the hub? I have always been told that two strokes are much more sensitive to back pressure, reduces power.
That's weird about the larger diameter prop having less torque steer, must have something to do with the hub size? My 4 blade 19P is 12.5" dia and has almost no torque steer, but the 3 blade 19P 13" has a little. (More if I trim up to the third hole!)
Sorry to ramble on guys, just keepin the light on till the troops get home...... ;)
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Yeah I agree a ventilated prop's gotta be pretty much useless on a thru-hull exhaust boat.
actually they do work with thru hulls. i dont have an exhaust bellows so there is a path for air to be drawn in. i've been playing with the vents in my laser on my intimidator. with them wide open it was rediculous, similar to a stall converter in a car.
it came out of the hole like a rocket with the tach pegged at 3k. problem was that my cruise speed was increased a bunch too, it would start to fall off plane at anything below about 2500.
I've got them plugged up now.
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Yeah I agree a ventilated prop's gotta be pretty much useless on a thru-hull exhaust boat.
i dont have an exhaust bellows so there is a path for air to be drawn in.
I've got them plugged up now.
The exhaust bellows is still on my drive, but I did plug the vents in my prop when I was having so much trouble "blowing out" on take off, and "grabbing air" on turns, after I raised the "X" dimention, just in the case that would have been a problem. I try'd 16 or 17 props before I got a good worker to go to the lab with, the PowerTech 14 1/4 X 23 worked the best, it has been to the lab 4 times, don't really know what the the pitch and rake is now, the vent plugs have since came out, don't know when, but I didn't notice any difference in performance.
Is that your red Intimidator with the nitros ? I was hoping to get to run along side with that boat, but there was so many boats to keep up with, my brain was on overload
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thats good info. wow, you've definitely spent some time figuring stuff out. I'm just at the beginning stages with mine, and im running a stock 260 [for now]
No, that wasn't me. i've got a blue '80 model.