Pursuit chine walking- advice?

[kwiktsi]

I'll try that next. I just tried to lower it a turn to push the nose down a little and holy hell did it not like that. I have never seen it get thrown from the water so violently at speed! Did a wicked pirouette though- just before body slamming the hell out of itself.. Have some more gel coat cracks and chips to fix now . This boat has gone 6 years without so much as a scratch. Then I have to go and get the "lets make it faster" itch and beat the crap out of it...

[ron1950]

as i said u are probably strecthing the limits of the hull but if the batteries moved forward dont help try the tabs....i beleave my pursut cog is about 11.5 inch from the stern

[properchopper]

The gentleman in post #9 is 100% correct. [adjust the driveline so the boat rides deeper in the water,more hull in the water]

You can fiddle all you want with your trim tabs to band-aid the problem, but to solve it you need to re-mount your stinger with the shaft centerline right at 3/8" above the keel line. The hull will settle in and the natural tendency to chine walk will be substantially minimized. Just do it
Fix the missing gelcoat; that alone causes drag on one side of the hull pulling it down.

A 4082 1600KV motor on 6S is overkill for that hull. Want the right setup ? A 4074 2000KV - 2200 KV motor on 4S and that hull will FLY !!

DSC04593.JPG DSC04592.JPG

[kwiktsi]

Thanks Propper! Looks like some work needs to be done. As for the motor, this hull has been on 6S since I got it, using a Feigao 12xl in it (8s on occasion as well) and it worked well for years before the motor finally crapped out so I wanted another 6S but 8S capable motor in it. It turned out though, as you said, to be overkill.. I can't see how it would be any faster with the 4074 you mentioned though? 2200kv on 4S is only ~3200 RPM's and won't spin as much prop as the 4082, will it? Not doubting you, just trying to educate myself on how it will work. I'm thinking maybe about simalar speed but much less violent?

As for the gelcoat issues- I agree, however, the issue was there prior to that as well and didn't seem to worsen any since so I was going to just let it be until I was ready to paint it. Thanks again.
Joe

edit- will raising the strut cause much more drag on the hull? Speed loss, amp draw, etc? I'm sure if it does lose some speed, it won't be as much as it loses to the oscillation of the chine walking though..

[properchopper]

My experience with the 4074 / 2200 KV motor {actually a Neu 1515 1Y but similiar) on 4S2P both in a DF33 and Cyberstorm32 (same bottom as the Pursuit) is that it's the perfect setup - I raced P-Mono with that setup for quite some time. For sprint racing I spun an M447 and both boats flew.

Last weekend my club member (theShaugnessy on OSE) tested his Pursuit for P-Mono racing with a CC/Neu 1515 1Y 2200KV (similiar to a Leo 4074 2200KV) on 4S2P and Stephen (Chiefy_44 on OSE) and I were BLOWN AWAY with how fast and perfect handling the boat was. I wish I had a video - you'd be very impressed.

Set the boat up correctly, stop overthinking it, and enjoy

:

Thanks Propper! Looks like some work needs to be done. As for the motor, this hull has been on 6S since I got it, using a Feigao 12xl in it (8s on occasion as well) and it worked well for years before the motor finally crapped out so I wanted another 6S but 8S capable motor in it. It turned out though, as you said, to be overkill.. I can't see how it would be any faster with the 4074 you mentioned though? 2200kv on 4S is only ~3200 RPM's and won't spin as much prop as the 4082, will it? Not doubting you, just trying to educate myself on how it will work. I'm thinking maybe about simalar speed but much less violent?



As for the gelcoat issues- I agree, however, the issue was there prior to that as well and didn't seem to worsen any since so I was going to just let it be until I was ready to paint it. Thanks again.
Joe

edit- will raising the strut cause much more drag on the hull? Speed loss, amp draw, etc? I'm sure if it does lose some speed, it won't be as much as it loses to the oscillation of the chine walking though..

[kwiktsi]

My experience with the 4074 / 2200 KV motor {actually a Neu 1515 1Y but similiar) on 4S2P both in a DF33 and Cyberstorm32 (same bottom as the Pursuit) is that it's the perfect setup - I raced P-Mono with that setup for quite some time. For sprint racing I spun an M447 and both boats flew.

Last weekend my club member (theShaugnessy on OSE) tested his Pursuit for P-Mono racing with a CC/Neu 1515 1Y 2200KV (similiar to a Leo 4074 2200KV) on 4S2P and Stephen (Chiefy_44 on OSE) and I were BLOWN AWAY with how fast and perfect handling the boat was. I wish I had a video - you'd be very impressed.

Set the boat up correctly, stop overthinking it, and enjoy

:

Did theShaugnessy move his stinger as well? I measured and it is about 3/16" from your 3/8" recommendation. I know it doesn't take much, but is it worth moving for that little bit? I know racing isn't all about the actual speed, but do you know the MPH of your Cyberstorm and/or theShaugnessy's pursuit with those setups? Now you've got me looking at new hulls to put this motor in lol. Thank you again.
Joe

[properchopper]

Can't say about Shaugnessy's stinger but there was no chine walk at all. Raising the strut IS worth the effort. My Cyberstorm was rigged for low 50's in heat race trim ; Mike's was faster but no GPS. It Hauled !

The Pursuit is a very good hull, basically a Cyberstorm splash. Tune it right & you won't need to get another hull.

Then again, a ride pad hull like the JetChopper30 when set up correctly has very little tendency to chine walk and rips with spec motors : testing mine with an AQ2030KV motor on 4S (boat is current NAMBA P-Ltd. Mono SAW record holder)

http://www.youtube.com/watch?v=Zx_WyN1yrBU

Or my other one with a 4074 sized CC/Neu 1515 1Y 2200KV on 4S2P : (underpropped) performing the amazing quadruple-double barrel roll [at 1.06] http://www.youtube.com/watch?v=ZSIN-KD9q78

100_0112.jpg

Did theShaugnessy move his stinger as well? I measured and it is about 3/16" from your 3/8" recommendation. I know it doesn't take much, but is it worth moving for that little bit? I know racing isn't all about the actual speed, but do you know the MPH of your Cyberstorm and/or theShaugnessy's pursuit with those setups? Now you've got me looking at new hulls to put this motor in lol. Thank you again.
Joe

[kwiktsi]

Thanks again, I just wanted to make sure it was worth it for that little bit. I see you are using the flysky radio too? I just picked one up a couple of months ago. Been worth every penny of the whopping $39 :). Also, like your barrel roll- that is exactly how mine reacted to the X450..

I do have one other question for you, Propper :)- I have a new AQ Revolt strut here that was bought for another project but is not in use at the time, since I am filling holes and drilling new ones, should I just ditch the stinger and change it to a strut?

[properchopper]

Either will work; I like stingers but it's personal preference. Some say struts give more adjustment range ONLY if you do a shaft flood tube but I've found most mono's do fine with a shaft height of 3/8" up and there's no need to adjust or go through the trouble of fabricating a flood chamber. Glad to hear you're taking the longer but better way out. Yup, love the FlySky. Have no explanation for the multiple/double barrel roll but the boat just walked away from it without telling me what caused it
The guys at the lake loved it 'tho

Thanks again, I just wanted to make sure it was worth it for that little bit. I see you are using the flysky radio too? I just picked one up a couple of months ago. Been worth every penny of the whopping $39 :). Also, like your barrel roll- that is exactly how mine reacted to the X450..

I do have one other question for you, Propper :)- I have a strut here that is not in use at the time, since I am filling holes and drilling new ones, should I just ditch the stinger and change it to a strut?

[kwiktsi]

Either will work; I like stingers but it's personal preference. Some say struts give more adjustment range ONLY if you do a shaft flood tube but I've found most mono's do fine with a shaft height of 3/8" up and there's no need to adjust or go through the trouble of fabricating a flood chamber. Glad to hear you're taking the longer but better way out. Yup, love the FlySky. Have no explanation for the multiple/double barrel roll but the boat just walked away from it without telling me what caused it
The guys at the lake loved it 'tho

Well, with the repair work the hull now needs and the fact that it's getting painted anyway, drilling and filling some holes is no big deal :).

[kwiktsi]

oops, double post

[lenny]

Hey,
I just looked at the stinger on my pursuit and it is at the bottom of the v,
Just like yours is.
I may try raising the stinger little on mine to see if it ride any better than it is,
And also try moving the cells around to.

[kwiktsi]

Hey,
I just looked at the stinger on my pursuit and it is at the bottom of the v,
Just like yours is.
I may try raising the stinger little on mine to see if it ride any better than it is,
And also try moving the cells around to.

I actually just got done filling the holes to move the stinger. When it sets up, I'm going to redrill it all to mount it as propper recommended (3/8" from bottom of V to centerline). It wasn't that hard to do and worth a shot. I think the stock location is fine up to about 40 or so, I have found that beyond that it gets a little unstable.. Ironically though, it wasn't this bad with the 12XL on 8S, even though the speed was there. I'm thinking it is the torque difference and the fact that I typically ran an X438 prop with that setup, less torque roll effect I'm sure than the 45+ mm props I run on it now.

If you saw how violently the boat got tossed from the water today and how hard it hit after experimenting with changing the stinger angle, you'd realize why I am giving up on trying to cover it up and would rather just put a bit more hull in the water lol. It rolled, submarined, flipped, skipped THEN launched out of the water and with the nose pointing down, spun like a top about 3' above the water several times (at least 3 full rotations!) then landed so hard upside down it cracked the hatch in some spots!! It was impressive and I wish I had it on video or had someone with me, it was a wasted event without someone else to admire it lol.

I was going to paint it anyway, but enough is enough with the gelcoat damage lol. If it weren't for shipping from overseas, it would be cheaper to buy a new hull then spend the time repairing this one! Anyway, probably going the color scheme of my Mustang in the pics below. Sorry for so many non boat related pics, trying to get an idea of the color since none of them are in perfect lighting.

[TheShaughnessy]

Thanks for the kind words Tony. As for my stinger the bottom of it is flush with the bottom of the boat and has a lil positive ( got it that way from a member here). All I did was a couple small adjustments on the tabs and put on a 5 inch ( down to 4 5/8 now and bottom is rounded. 2 7/8" down from center line of prop) rudder from kintec. Also mine doesn't have two sets of tabs just one wide one. Those are about 1/16 up from the keel and then level off at the trailing edge. It runs good in smooth water but it is on the loose side for chop. CG is at ~ 9 1/2 from transom. I'll post a pic if you want to take a look.

[kwiktsi]

Thanks for posting. Sure, if you don't mind posting pics, I wouldn't mind seeing them. Mine would be pretty smooth on the first lap, once ripples started forming in the water, it would get loose and start rocking real fast! I'd have to measure to be exact but my tabs are about 1/8" up from the bottom and I have them running parallel to a straight edge off the bottom of the boat. You're saying yours were angled down about 1/16" at the trailing edge basically? Thanks again.
Joe