BBY's Conquest build

[RandyatBBY]

Thanks.Im running 3/16 flexes with mine.I like your tube supports.Looks overkill-in a good way and looks good.

In the boat they were built for, a 92 inch HPR. There was a lot of room. In this Conquest it will be a little tighter.

[RandyatBBY]

I have also found that using S bends I like to have a extra thickness or more clearance in the stuffing tube, It just makes it way too hard to pull the shaft in a out. I have made them to fit just big enough then the bends make it too tight. so from now on I make them a little bigger.

[RandyatBBY]

I can not belive I spent the day building these yesterday. It was all setup of the mill.


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[Brushless55]

Wow, this looks very cool!

[ManuelW]

Hey Randy,

really very nice build. But for the next time I'd really recommend to avoid the S-bend of the flex shafts. I think it will increase performance and also look better.

But for the rest, keep up the good work!!!

Best regards,
Manuel

[RandyatBBY]

Hey Randy,

really very nice build. But for the next time I'd really recommend to avoid the S-bend of the flex shafts. I think it will increase performance and also look better.

But for the rest, keep up the good work!!!

Best regards,
Manuel

The motors are so big I could not turn the motor so there would not be a S bend. I would have to cut a hole in the side of the boat to do so. It is the dihedral part that is too narrow. But thanks I like all of your work except the fixed Motor Mounts, You have done some real wild stuff. I like motor mounts that are easier to get the motor in and out of the boat. I have built fixed motor mounts in some of my boats and at a race when I had a lack of time they drove me me crazy!

I have not done SAW runs with this boat or Power. It would be interesting to see the difference. I have ran s bends in .150 and smaller the motors do not have enough power so it does decrease performance in that application. But with the massive power in the 2215 2Y it just gives you another bearing point. and the stuffing tube needs to be a lot bigger than with a single bend.

I have friends who have done SAW test with one inch Nitro motors and they say it is better preformance with a S Bend on on 3/16 and larger over the single bends.

Oh thanks for the nuggies or complements !

[RandyatBBY]

Wow, this looks very cool!

Thanks

[RandyatBBY]

Hey Randy,

really very nice build. But for the next time I'd really recommend to avoid the S-bend of the flex shafts. I think it will increase performance and also look better.

But for the rest, keep up the good work!!!

Best regards,
Manuel

Thanks for posting Good or bad I like reply.

[martno1fan]

Looks good,Randy.I have just bent one of my stuffing tubes for my triple cat the same way you have in the above picture.Have you ever ran a boat with the tube bent this way?I feel no binding with mine,but it makes me paranoid that something bad might happen.

Its been proven a good S bend is better than one single bend it actually creates less friction so dont worry .
Mart

[ManuelW]

@ Randy:
Interesting to hear, because here we have the complete opposite opinion. An S-bend in the shaft is an absolute "No-Go" here, we all drive single bends and especially in the "superfast" boats. Had the luck to see the three fastest cats in the work driving, they would use S-bends if it would have less friction. My opinion: smooth single bend and a suitable brass/aluminium tube with teflon tube inside --> perfect solution and well-proven for FE.

Its difficult so see on the pictures but I'd say there is always a possibility to tilt the motors enough to get a smooth single bend, also in this Conquest hull.

And for your motors: Well I think fixed mounts as I use them may have cons concerning fast motor changes but I'd say I hardly ever have to change the motor so its okay for me and for the boats I build. As some Pro's I think they look nice, have little weight and increase stiffness of the hull.

Best regards,
Manuel

[RandyatBBY]

@ Randy:
Interesting to hear, because here we have the complete opposite opinion. An S-bend in the shaft is an absolute "No-Go" here, we all drive single bends and especially in the "superfast" boats. Had the luck to see the three fastest cats in the work driving, they would use S-bends if it would have less friction. My opinion: smooth single bend and a suitable brass/aluminium tube with teflon tube inside --> perfect solution and well-proven for FE.

Its difficult so see on the pictures but I'd say there is always a possibility to tilt the motors enough to get a smooth single bend, also in this Conquest hull.

And for your motors: Well I think fixed mounts as I use them may have cons concerning fast motor changes but I'd say I hardly ever have to change the motor so its okay for me and for the boats I build. As some Pro's I think they look nice, have little weight and increase stiffness of the hull.

Best regards,
Manuel

Thanks for the reply. Interesting discusion,

One thing I am using a 1/4 flex shaft and I have had a experience that with Teflon liner and a hot setup in oval trim the shaft will weld it self to the stuffing tube. To eliminate this problem I have gone to no Teflon and double wall stuffing tube. I will be at the SAW's in about three weeks If I have the chance to run identical setups with single bends and double bends this would be proof one way or the other.

I guess that Myself and martno1fan is not enough to convince you. Please do not get mad just discussing with you. I respect your passion and ability.

[martno1fan]

There have been tests done regarding s bends and single bends the fact that the flex is suppoorted at two points in the s bend stops cable slop and thus cuts down on the friction(thats my uneducated explanation anyways lol).A guy showed the test results he did and the s bend was the winner hands down versus single bend .There was a thread on it on Jims a few years back if memory serves.Have to agree with Randy though on teflon liners .
Mart

[RandyatBBY]

There have been tests done regarding s bends and single bends the fact that the flex is suppoorted at two points in the s bend stops cable slop and thus cuts down on the friction(thats my uneducated explanation anyways lol).A guy showed the test results he did and the s bend was the winner hands down versus single bend .There was a thread on it on Jims a few years back if memory serves.Have to agree with Randy though on teflon liners .
Mart

This is all for high speed large flex shafts (3/16 and 1/4). For sport small flex shafts .150 and below with low RPM a single bend and Teflon is fine. In fact the best for the application.

[ManuelW]

Hi Randy,

well why should I get mad? Its just a very nice discussion and not a war. Only thing which might be interesting, if you see it as "spam" in your building review that we could start a new thread for the discussion.

But to the topic: Well you are right and I'm not yet convinced that something that I've succesfully used in two high speed projects as well as my friends just is not the optimal solution.

Maybe I can convince you:
So you tell me in a hot Oval setup your Teflon liner of a 1/4" just melted ? - then I'd definitely say it was a user mistake!!

Here maybe the most powerful FE boats:
-hull: HPR 233, RTR weight around 60pounds
-engines: LMT 3080/8 (at >3pounds each about 25% bigger than a NEU 2230!)
-lipos: 12S4P Kokam 4000 --> giving a 12S 16.000mAh for each engine
-Props: Octura X463 or bigger
-runtime: about 10min
-speed: ~140km/h
-flex shaft: 1/4" Flex shaft with Teflon liner, single bend

Photo:


Performance:

http://www.youtube.com/watch?v=7rvzYgF28JE

I'd say 99% of FE-boaters will never put through that much power. And it just worked great with 1/4" flex shaft with Teflon liner and a smooth single bend. At these performance even 1% loss would instantly melt the whole system but it was nearly cold after running. These guys absolutely know what they did I'd say. Its just the question to use quality material as well, there are different 1/4" flex shafts and teflon liners availabe - as well as the correct building of the system.

Best regards,
Manuel

[Killer V]

BBY's Conquest Build

Randy,

Take all what you here with a grain of salt. It may all cloud your mind. You built me the finest and one of the fastest oval racing Riggers I have ever seen or owned. You do amazing work, mostly from what is already in your head, and from the hundreds of builds already under your belt.

My opinion, under the conditions, and the large motors, you will see little drag with your S bend stuffing tubes. I would not use a liner in this case. Just support the stuffing tubes well, as you have so ingeniously designed.

Continued success and all the best.

Jeff Lucca