Pursuit chine walking- advice?

[Fluid]

I think it just might be making too much torque for this hull and that sends it out of control when something does happen.....

Reducing prop diameter may help. With that motor on 6S and a prop pitch of 2.5" you should be near 55 mph, but if the hull isn't stable it may not reach that speed. An x462 seems small but it has enough pitch and will have less torque reaction than the 45mm and 50mm props. The boat may take awhile to plane off but if it hooks up it may help with the instability.

It was hopping pretty bad through turns after the change...

This can usually be cured with a larger turn fin. The fins in your photo are IME too small for reliable high speed turns. Try a larger one on the inside corner, that will help. I use one of these fins on the right corner of my Titan 40 and it hooks up and turns great. http://www.offshoreelectrics.com/pro...prod=ose-80067




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[kwiktsi]

Reducing prop diameter may help. With that motor on 6S and a prop pitch of 2.5" you should be near 55 mph, but if the hull isn't stable it may not reach that speed. An x462 seems small but it has enough pitch and will have less torque reaction than the 45mm and 50mm props. The boat may take awhile to plane off but if it hooks up it may help with the instability.

This can usually be cured with a larger turn fin. The fins in your photo are IME too small for reliable high speed turns. Try a larger one on the inside corner, that will help. I use one of these fins on the right corner of my Titan 40 and it hooks up and turns great. http://www.offshoreelectrics.com/pro...prod=ose-80067




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Thanks Fluid. I was wondering about going with a 642 for the reason you mentioned, gonna have to oder one from somewhere. Any recommendations on where? Also, I raised the fins the other day after reading somewhere that it may help with the chine walking. It still handled fine then with them and wasn't until I relocated the stinger that I had this issue (that or I just didn't notice before). I didn't even think to try dropping them to see if that helped. The stinger angle made a big difference there. I'll give lowering them a shot and go from there. I'm getting tired of swimming out to get this thing. I live in FL, we have some nasty critters in the water here lol. Thanks for the tips everyone and Happy 4th!

[Heaving Earth]

V hulls are more sensitive to prop changes because of their shape. You're trying to balance a triangle.
Fluid is correct, try smaller diameter more pitch.
Also correct about larger turn fins. My df 26 had the same hopping in turns problem. I went to a med turn fin which seemed oversized at first, but cured the problem entirely

[kwiktsi]

V hulls are more sensitive to prop changes because of their shape. You're trying to balance a triangle.
Fluid is correct, try smaller diameter more pitch.
Also correct about larger turn fins. My df 26 had the same hopping in turns problem. I went to a med turn fin which seemed oversized at first, but cured the problem entirely

I agree as well :). I need a source for S&B props and I'll try a 642. Any recommendations? Steve is always out of stock (understandably) and I used to get them from Fine Design, but, uh, umm how do I put this nicely? He will never get another dime from me...

As for the hopping, it never used to- it carved turns like it was on rails. I did not notice it until I raised the stinger mounting point. Now, I don't know if it is because I raised the fins the other day or if it's because when I re-mounted the stinger, I set it at neutral again to start over. I added some up thrust and it is much better. I'll lower the fins next time out and see what happens from there. Thanks!
Joe

[TheShaughnessy]

I have a couple x642's ready to go, one with the tongue removed and one just sharpened and balanced. 22 shipped for either one if you are interested in trying one. I personally stick with three bladed props for monos just because that's what all the gas guys around here run on their big monos and I always thought you got less torque roll issues with them.

I would have thought your turning would be better after raising the stinger cause it should have reduced lift and let the stern get nice and planted in the corner. Tony pointed out that my fins may be on the small side for race water so maybe larger fins would indeed help.

Lenny ill work on that pic.

[kwiktsi]

I have a couple x642's ready to go, one with the tongue removed and one just sharpened and balanced. 22 shipped for either one if you are interested in trying one. I personally stick with three bladed props for monos just because that's what all the gas guys around here run on their big monos and I always thought you got less torque roll issues with them.

I would have thought your turning would be better after raising the stinger cause it should have reduced lift and let the stern get nice and planted in the corner. Tony pointed out that my fins may be on the small side for race water so maybe larger fins would indeed help.

Lenny ill work on that pic.

PM me paypal info :). I have never used a 3 blade but have been curious about trying them, maybe I'll pick one up for this after trying the 642.

The turn issue after raising the stinger could very well be either the fact that I had it set neutral or just a touch negative to start out where before I always ran a couple degrees positive, the fact that I raised my turn fins the other day or a combo of both :). It was much improved after adding some positive trim to the stinger. We'll see how it is next time out with the fins lowered.

[Diesel6401]

The Pursuit is a great Hull once you get it dialed in. Here's mine. Seaking 180 w/ extra caps, Leo 2200kv 4s2p 10,600mah. The props I like on it are the m445 and I ran a x447 bar-cut but liked it better on a different boat. The prop in the video is a nasty little work of art Chuck did for me. Runs sick, but heats things up. A 4082 would be better on my situation.

https://www.youtube.com/watch?v=-_1r_fSjGhE&feature=youtube_gdata_player

Samsung Galaxy S3 via Tapatalk

[ray schrauwen]

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

:

Tony, what battery setup is this using? What esc too please... thank you!

I think I may get a new P-mono hull, my DF33 is great for P-spec sprint but, crazy chine walk with P-mono power and I've played with the strut like crazy!

I run a FC 4092-2200kv and SF200 esc, really 2200kv as per TP Power's emails not what they have on there listings now of 2100kv.

[ron1950]

i also have the fc 4092 in mine right now m445 but run only on 4s runs great and trim tabs are touching the stright edge at rear of tab...that stopped the chine walking

[lenny]

What speeds are you getting with that fc 4092 motor and is it 2200kv ?

[ron1950]

dont know the top speed but seems to be a little quicker then leo 4074..switching it all over to nue 1515 1y next

[lenny]

Hey,
Any luck getting some pictures yet ?
And was Fluid talking about a x462 or a x642 prop in his post on hear ?
I just adjusted my setting again on the stinger and tabs,
And they should be close to what you have on yours.
I will be using the x447/3 again on 4s and 5s,
And see how it runs and what speed I get.

I have a couple x642's ready to go, one with the tongue removed and one just sharpened and balanced. 22 shipped for either one if you are interested in trying one. I personally stick with three bladed props for monos just because that's what all the gas guys around here run on their big monos and I always thought you got less torque roll issues with them.

I would have thought your turning would be better after raising the stinger cause it should have reduced lift and let the stern get nice and planted in the corner. Tony pointed out that my fins may be on the small side for race water so maybe larger fins would indeed help.

Lenny ill work on that pic.

[Flyguy55]

I don't think anyone has mentioned it , but be sure the turn fins are straight and parallel with the keel . Not Just 90 deg to the transom . I have a Insane 34 with a NEU 1527 1D . Its very fast ,It turns any prop I put on it. but for 2 seasons Ive tried to solve the chine walk. Ive tried all the things mentioned above . The chine walk would increase till it flew off . I had Lenny from Rum Racing look at it . He put a straight edge on both turn fins and each was towed in a several degrees . The transom isn't straight and true . I tried washers under the mounts to get them close and it made a big difference . When I get them perfect I think the chine walk will go away .

[ray schrauwen]

I've been brass shimming a bit too on my DF33... it takes time on water and patience, some things I have little of at times... mainly pond time.

[ray schrauwen]

I've been brass shimming a bit too on my DF33... it takes time on water and patience, some things I have little of at times... mainly pond time.

I just thought of something cool!