Top end? Recent Comments

re: Top end?

2009-07-15 21:49:33

posted by: Goosefishmen.

Horsager Said:
Goose, sounds like the rubber washer in your hub is stripped out.

What rubber washer are you referring to? I took prop off, plastic hub was good, all the plugs are in the ports, and, prop appears to have no damage. I am doing some searching, but any help is appreciated.

Good luck with Pro V this weekend, he guided me last weekend - he is by far one of the best flat fish guides I have fished with, right up with Captian Ahab White Bass on DL.

re: Top end?

2009-07-15 20:52:10

posted by: Pro V1. Clay, we will have to take a look at it on Friday when we go out. My motor also throws a signifigant rooster tail so I think you may be onto something?

re: Top end?

2009-07-15 20:39:51

posted by: Pro V1. On Sunday I got 43.8 (gps) @6000rpm. I should be able to run a 21 pitch without any problems not? What kind of increase in top end am I looking at?

re: Top end?

2009-07-15 17:43:33

posted by: eyexer. yep and having to over trim to try to get the needed results. That is also a true sign of too much motor in the water so raising one hole I'd bet will get him where he needs to be.

Allen Said:
sweeney, that's because it's easier to throw water up into the air than it is to push it backwards into the lake.

High rooster tails are a sign of inefficiency.

re: Top end?

2009-07-15 10:56:18

posted by: Allen. sweeney, that's because it's easier to throw water up into the air than it is to push it backwards into the lake.

High rooster tails are a sign of inefficiency.

re: Top end?

2009-07-15 09:22:02

posted by: YarcraftStorm. Wow, that got to be pretty long, sorry about that, lol!

re: Top end?

2009-07-15 09:21:31

posted by: YarcraftStorm. ProV1, If I were you I would likely stay with a 19P but I would change to a nice stainless cupped prop like the Tempest or Enertia. If you go up to a 21P you may gain very slight performance edge on the top but you'll likely be very disappointed with it when you load up the boat at all. You want to select the prop that puts you within a 100rpms of max when running really light, thus when you're loaded it will still be acceptable. according to you're numbers, you've got the right pitch.

Sweeney, it does seem a bit odd that a stock 21M would out do the same pitch Tempest but every boat is a little different. The other thing is with stock props, even a tempest, they can have significant cupping and pitch differences just due to manufacturing. This is why a balence and blue printing of a prop always pickups performance over a stock prop. Is it possible you got a bad or slight off Tempest??? I will say that it wouldn't supprise me.

You say you have an HPDI, which if that's correct they have a max RPM of 5500, yet you're talking about running closer to 6000 which tells me you are either 500 rpms over max or you actually are running a F200 four stroke. This makes a pretty big difference in you're prop selection. Heck the HPDi is a 1.86 gear and the F200 has the 2.00 gear wich alone would change you're prop selection. If you indeed have a HPDI 2 stroke, you're asking for trouble running it 500 rpms over the max reccommended range. I'm not sure what year or model you're running so this is all just a guess based on what yamaha currently offers. Is it an HPDI VMAX by chance?????

At this point my best guess is you have a 2 stroke Yamaha that has a 1.86 gear and I'm going to assume that you're within you reccommend RPM range at 5950, If you're not, you're at your own risk!

I was gonna tell you to try a Rev 4 but if the tempest isn't working for you a Rev4 deffinately won't! Since you were able to run 53.4 @ 5500 rpms it tells me that you should pitch down two degrees with a temepst. to be comparable to you're 21M rpms. You're top number running 5950 with the tempest shows that you gained little by triming out other than lost effiecency. Bassically you trimed out, you gainned RPMS and very little speed. You certainly don't want to go up to a 22 or 23, I would start out trying a 19P Tempest first and get your RPMs up around 6K if thats where they actually need to be. I run a 21P tempst because it puts me within a 100 rpms of my max 5750 RPMs but I also have a 1.75 gear. A 23P did nothing for me but lose performance all the way around. I may have gained a slight speed edge when dead emty, but that was it!

Something with you're number doesn't make any sence at all, you're running around a 12-13% slip with the 21M (assuming your number are accurate) which is pretty darn decent for a deep V walleye boat. The number's you got from the tempst show only a 14% slip at 5500 rpms and 53.4 mph but it doesn't make any sence what so ever why you didn't get the other 400 rpms out of it. Was the boat loaded the same, was thee weather the same, did you run them both at the same elevation???? I only ask because there is no way you should have lost 400 rpms and 3.5 mph with the tempest. The most you should have lost was about 100, maybe 200 rpms.

If you're sure about you're numbers I really cann't say that any prop will net you less than a 12% slip at WOT, good luck because that 21M is a one of a kind!

re: Top end?

2009-07-15 06:59:28

posted by: Tim Sandstrom. Testing.

re: Top end?

2009-07-14 07:31:12

posted by: sweeney. I had the props at my disposal, for one, 2 the need for speed i guess. moving it up a hole might be something to do whats funny is when i trim it out my top speed is actually with about a 6 ft high rooster instead of the all out 20fter, thats what makes me wonder about moving it up my thinking is probably way off on this too.

re: Top end?

2009-07-13 21:40:58

posted by: Horsager. V we need to look @ motor height 1st, I've got a sneaking feeling the motor's lower than necessary.