JAGERMEISTER Mean Machine

[kevakov]

UPDATE ran the Jager MM this morning , I love the roster tail it has and runs very smooth, my Matrix rigger was always on the edge of controll and ready to crash.

GPS was 49mph with a M545, good temps. I have a M645 to try.
Strut is 3/16 above the bottom of the sponson with 1 degree of negative or prop up in the back. Also did move the lipos back and the CG is at 9 inches from the transom.

The Hydra 240 is used and when I ran it in the Matrix rigger it seem to be not as fast as the other Hydra 240 I had , so I may get a new Hydra 240 and send this one in to be worked on.

Maybe with a new Hydra 240 and different props I can get around 55mph which is my goal, I got an extra 8 mph from tunning the Matrix rigger I had, so we shaw see.

the JB weld on the rudder servo mount held up fine, and the grease leak is gone.

[forescott]

Looks fantastic! Nice attention to detail!

[rearwheelin]

I run my stuffing tubes all the way into the strut and leave enouph room on the otherside to counter sink the bushing . After you find your strutt spot I would re-doo the stuffing tube. My trick to easily push the tube into the strut and remove is simple. Less drag and more speed too.

[Rich]

Wouldn't the 1 degree prop up be positive? or am i thinking wrong?

[forescott]

That would be my interpretation.

[kevakov]

UPDATE Ran the Jager MM this morning with the M645, now getting 51.5 mph with the strut 1/8th inch above the sponsons.

Have an X440 3 blade prop to try next, should get a bit more speed, if its anywhere near 55mph that is plenty fast enough for this hull.

I really love the way this hull handles in the water, the turns can be very tight, run it in figure eights , oval, square, left , right or whatever. It is the best all around sport boat I've seen.

Also cut the 6 inch rudder down to 4 3/4 inches, still turns great.

[Fluid]

The x440 has a LOT less pitch than the x645 does, so it is doubtful it will be as fast. The motor will have to spin about 35,000 rpm to hit 55 mph, while the m645 would be turning around 26,000 rpm. Which wind 1518 do you have?

Since the m645 was faster than the m545, I believe you're probably better off to pitch-up the m645....but that really depends on the Kv of the motor.


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[kevakov]

Fluid: I'm running the Neu Castle 1518 1y 1800kv with 5s . Truning 33,300 rpm on 5s

I hope to work on the X440 3 blade this weekend, de-tongued.

[Make-a-Wake]

That is a stunning boat Kevakov.

[D&D]

I still don't understand! I guess when I see the JAGERMEISTER MM setup (1518 on 5S) I expect it to blow my setup out of the water (Mean Machine, 1515 lY on 4S). Now the JAGERMEISTER MM is a beautiful build and is running great, but this a comment to my lack of knowledge. Is this a difference of rpm versus torque, bigger motors running less KV and rpm?

[D&D]

I just read the discussion concerning stuffing tube/strut setups and had to comment. First of all I run a .187 flex shaft on my MM setup and use a 9/32 stuffing tube (vice the recommended 7/32). I am using a Speed Master strut with the brass bushing for my bearing. Using this setup I shoved a 1/4 tube though the strut and left 1 inch sticking out the front (towards the boat) of the strut. I then slide the 9/32 stuffing tube over the 1/4 tube which extends from the strut and that works perfect - no problem adjusting or removing the strut from the boat.

[Rich]

I still don't understand! I guess when I see the JAGERMEISTER MM setup (1518 on 5S) I expect it to blow my setup out of the water (Mean Machine, 1515 lY on 4S). Now the JAGERMEISTER MM is a beautiful build and is running great, but this a comment to my lack of knowledge. Is this a difference of rpm versus torque, bigger motors running less KV and rpm?

D&D, a lower KV = more torque on any brushless motor but i think that there is way more to it.

If I were to compare two the of the same brands like neu's, with the same size motors but different KV's the motor with the lowest KV will have the most torque in that group.

If I were to compare two different size neu's with the same KV, the larger one would have more torque IMO, since it has a larger inertia.

I tried to get my MM to hit 60 like Fluid's did with his 1521 1D, that motor has a KV of 2900 and he was running 4S2P. That motor is rated at 1750 watt continuous. Since i was on a buget i used the feigao 580 6L KV 2154 1800 watt continuous and 70K bearings. The neu is a 4 pole motor with more efficiency and the feigao is a 2 pole more with less efficiency, I would need a lower KV 580 with more cells to get up to that speed simply because the neu is way more efficient and has way more torque.

Lower Kv can handle more voltage but less amps

Higher Kv can handle more amps but less voltage

This is why we have to find a happy balance of setup and props

[Fluid]

I'm running the Neu Castle 1518 1y 1800kv with 5s . Truning 33,300 rpm on 5s

Wow, then you were seriously over-propped with the x645. Good luck.




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[Fluid]

I'm running the Neu Castle 1518 1y 1800kv with 5s . Truning 33,300 rpm on 5s

The Neu motors usually don't run at the Kv-calculated rpm, they don't produce the most power there. Most are best at ~90% of the calculated rpm. Good luck.




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[kevakov]

D&D I did the same thing with the strut and brass tube, except mine is .187 flex into the 7/32 brass tube into a short 1/4 brass tube into the strut.

Some have said that this will be a tight set-up for the flex, when I turn it by hand its seems to be OK, maybe it will break in after some run time, if it doesnt , I'm going to make a tool with some extra .187 flex and a dremel bit to hone it out some.

One other thing about the lower speeds , my Hydra 240 is a used unit and when I got in the mail it had a burnt smell to it , I really think there is something wrong with it, I did manually program the throttle end points to my radio, not sure if it helped, I may get a new Hydra 240 and see if it helps, but as it is its a great sport runner.