42" Hull, Lehner 19or22 series..

[nate]

Iv seen guys push 45" hulls w/ 1940/50 Lehner series, Is it better to go with the 22 series for SAW runs...or stick with 19 series..

[nate]

Hull:42"L-13.25"w

[photohoward1]

I'd go with a 30 series but hey what do I know?

[nata2run]

What hull exactly? 30 series can work in cats from 54" up to 90" but a 3040 will push a 45" mono nicely? So depends on what hull to answer the question.

[nate]

H&M Bandit M. Seen this hull run with both 1940's, and 22series both 6s setups, almost Identical speeds... Im sure the 22 series will turn a bigger prop and keep a cooler temp... But the price diff is a big issue haha.

[nate]

2250/5 on 6s...Hmm. This would be hottttt im sure...

[nata2run]

2250/5 on 6s...Hmm. This would be hottttt im sure...

Yeah, don't do that, this setup would be better for a saw cat in a HPR 115 or similar it's way over 50k rpm. Plus you would need some high end drives and other equipment also. So much that could go wrong in a setup like that. You should maybe consider a 2240 in the 2000kv range to play it a bit safer. How fast you want to go?

[keithbradley]

Is this a twin or single motor setup?
When you say "SAW runs", do you mean it in the literal sense? Are you going to compete with this boat? I ask because people often use that term just to mean that they're driving in a straight line and want to go fast.
If it's a twin cat, 1950/7s on 6s would probably surprise you. 2250s are a bit large for that hull. Also, realize that there's more to going fast than just picking a motor kv and voltage that will give you crazy RPM. If you want to run a 2250/5 on 6s, you not only need to have a very loose budget and a willingness to buy the best components and replace them when needed, but you need to be willing to lose all of it on the first run.

You can come up with all kinds of combinations that will go theoretical speeds by surfing the forums and reading other people's setups, etc. Nothing can replace experience though. Being able to buy a setup that spins fast is something anyone can do, but being able to use that power and get the most of it will take a lot of learning. You will be much better off if you start out with something in a much lower RPM range and learn to get the most out of THAT before you move forward. If you do, you will likely change your choice in setup by the time you're ready to make that step.

The fastest catamarans in the world are running far less RPM than what you're considering (around 40k), and there's a reason for it.

[nate]

I say SAW setup, because that would more less refer to the style of cat I want, yes just two or three quick fast passes. I would like to see 80's or mid 80s.

What is the trick in a good driveline, it seems that every problem is hinted towards driveline setup...

Whatever I decide, will be coupled with MBP collets.

[keithbradley]

I say SAW setup, because that would more less refer to the style of cat I want, yes just two or three quick fast passes. I would like to see 80's or mid 80s.

What is the trick in a good driveline, it seems that every problem is hinted towards driveline setup...

Whatever I decide, will be coupled with MBP collets.

A pair of 1950/7s will get you there if the rest of the setup is right. 2240/8s would be an option as well.
Driveline issues are in regards to your potential motor choices. To run 50k RPM you need balanced components, quality drive construction and ball bearings. That is not to say it is impossible to run high RPM on cheap components, it's not. It is, however more problematic.

[nate]

So I tested my skills a bit, Had a few scrap tubes and parts laying around, so I decided to do a practice run and bend up two 7/32 drives and see how well I can match them up. Im working on the second drive right now, build twin drives is a first for me... Heres one, its pretty beefy. And btw Keith, I think Ill go ahead and run under 40k. I really want a 6s setup though. 8s packs are high. 8s1p. I believe Lehner makes a 19 series motor just below 2020kv, should be ok on 6s and small props.



DSCN6187.jpg

[keithbradley]

Nate,

The 1950/6 is 2090kv
1950/7 is 1791kv

The 1791kv 1950/7 will give you speeds comparable to a 2000kv Neu/Leopard/TP on 6s
The 2090kv 1950/6 would compare to a Neu/TP/Leopard around 2300kv on 6s

[NativePaul]

In case you were wondering why, Lehner quote their KV loaded and nearly everyone else quotes it unloaded.

[nata2run]

Not knowing your situation and the amount of $$ you want to spend, it would be quite nonsense to buy a Lehner with the "wrong KV" only to replace it when you one day want to go faster? You can buy many TP motors with different kv's if you firmly want to run 6s. If you want 80mph, a 1400-1500kv Lehner should get you there with the right choice of prop, but you will be up for about 1k in motors. Honestly, if you are not aiming for particular performance but just playing around then why the outlay? Maybe consider a nice set of ESC's (MGM or something) and go for a cheaper motor option to begin with. It will only cost you a couple hundred to change over the motors for a different kv. Maybe start with TP 4050 1800kv (could get you between 75-80mph) and work your way up. Maybe after running those you have a better idea of how the boat runs and by then you will have an idea of what Lehner to buy. I do like the Lehners a lot, and usually buy them with 6 output connectors so I have options and can run 2 KV values (one in Wye and one in Delta) on different cell counts. That may not apply to you if you are set on 6s though?