Is 40 too much to ask for???

[Brushless55]

Yeah Im thinking thats next, a different ESC. But even at high 30's on 4s, It is a blast and gets most of the people out of their houses along the pond to come out and check things out. Seems at times, like this afternoon, I spend more time talking to people about it and answering questions than I do running it.

Add a BEC and a good 3s pack with your good 2s pack and have a blast!

[domwilson]

Somebody got bit by the speed bug... Which is faster now, Your BJ or your Imex?

[tiqueman]

Somebody got bit by the speed bug... Which is faster now, Your BJ or your Imex?

Haha... DARN IT!!! Well, I never got to gps the BJ w/ the factory esc and motor. HOWEVER, It seems to run better with the Imex electronics in it than the Imex hull did. I reconfigured the BJ to run off of a single 3S pack. At first I did not set it up well as the hull would turn over even at 1/4 throttle in a turn. It was too top heavy and cog too far foward with the batt sitting across the tunnel in front of the motor. So I moved things around and now its MUCH better. Im pushing it w/ a 637 (just until I get it set up right) and its staying very cool w/ what seems to be decent speeds. Nothing like the BJ stock set up, but its still fun. I plan on running it w/ the gps and more testing/ tuning tomorrow.

The Imex hull is loving the BJ motor and esc. I think its probably about the same in top end, but it corners amazingly. It would definitley walk all over the BJ in a lapped event, no doubt about it. After reading the links you posted, Dom, in the cog vs strut angle thread, im going to try a few more different things tomorow and see what kinda magic I can create.

[domwilson]

Why not run 4s in the BJ?

[tiqueman]

Im workin on it. Baby steps. When I ran the Imex cat on the imex esc and motor on 4s, a 440 was all it would handle. The 442 ran it WAY hot (motor hit 170). I ran the heck out of it yesterday afternoon (Imex hull, BJ esc and mot) on the 642 and it came out pretty warm. I didnt have my temp sensor down at the pond w/ me and when finished I went to a neighbors house as they were all out bbq'n. Food took over checkin the temps. It was probably warmer than it should be. The wires seemed to be the hottest and the deans were really hot. I could hold my fingers on all components w/ out taking them off due to the "ouch" factor, but I couldnt hold the deans connectors. I think Im going to go w/ bullets.

Dom, have you recieved those Tunigy packs yet?

[domwilson]

Yes. I haven't run them yet. I've been sidetracked with so many projects. Hope to get to the pond soon. I have a few boats I want to run. Just too much going on right now.

[tiqueman]

I meant to put this in the first post and forgot...

I quickly cut a piece of wood for the radio tray. And I took a piece of angle aluminum and went to town w/ my dremel to make the servo mount. Originally, the servo and receiver were held in with zip ties... that worked fine for the rec. but there was a little but of slop in the servo.

[tiqueman]

After reading these... (thanks again Dom)
http://findarticles.com/p/articles/m...6/ai_n8865020/
http://findarticles.com/p/articles/m...=rbxcra.2.a.22

I was able to squeeze another fraction of a mph out of it on 4S, going from 37.7 to 38.1mph. I know its not much, but its progress. And really all I did, was went back to my strut setting that got me the 37.7, set the strut angle to 0 with the hull (rather than angled up a bit) and moved my cog from 32% to 28.5% (about one inch)

[tiqueman]

What the.... Please explain this to me

I finally found the optimal strut depth/ angle and as I said, reached 38.1 on a 642 Ive been goofing around also w/ my BJ hull and w/ the set up I have in it (not the BJ motor or esc) I found that a 637 will run the boat .5 mph faster than a 440. I spoke w/ Domwilson and a good point he brought up, the 637 has a bit more pitch, even though it is smaller...

NOW BACK TO THE BOAT AT HAND, I just ran the 32" cat hull again, (BJ motor and esc) got another 38.1 run on the 642. Then I changed to a 442 and ran a 39.6. I didnt believe it so I reset the gps and did it again w/ a 39.5. I put the 642 back on and ran a 38.0, then tried a 440 and ran a 37.6.
How am I going faster (1.5 mph) on a 442 than a 642??? Is the pitch of the 642 just loading it a bit much???

Oh and Im not Bit@#n... Im pumped.. I just dont get it....

Oh yeah, and this is all back on 4S

[Simon.O.]

What the.... Please explain this to me

I finally found the optimal strut depth/ angle and as I said,

How am I going faster (1.5 mph) on a 442 than a 642??? Is the pitch of the 642 just loading it a bit much???

Oh and Im not Bit@#n... Im pumped.. I just dont get it....

Oh yeah, and this is all back on 4S

Where is your strut at now ?
I am not surprised at all that the 442 causes more smiles. The 642 will be loading up your power train and is clearly not spinning up enough. I have the exact same issue in my 29"mono. The 440 is better than the 640. Different story on the rigger though.

I do hope that you are writing all this down in a notebook. I learnt that from a very clever bugger here and it is very valuable for keeping track of setup changes.

Excellent work too.

[domwilson]

Congratulations on you're speed improvement. I think you can get even more with that X642 as the BJ motor is pretty strong.

When you changed props did you do any adjustments to the strut? Sometimes a particular adjustment will work for one prop, but not another.

[RCprince]

The Bj motor is awesome, I used it with 6s and a x440 to push a Sv pass 50.

[tiqueman]

Simon.O., yes Ive been writing EVERYTHING down, from strut adjustments, props, batt location (cog) temps, water conditions (which have all been in glass water so far), minutes on Batts at each trial and a few other things.

My strut is about 3/16 above the bottom edge of the sponsons and with the hull sitting on a flat surface, the strut is level w/ the surface. Of all my moving it around w/ the 642, this is where it ran best. Raising it slows it drastically, I tried angling it up and it slows it slightly and lower slowed it slightly as well. BUT, I found this was the optimal placement for the 642. I havent moved it for the 442 yet.

Congratulations on you're speed improvement. I think you can get even more with that X642 as the BJ motor is pretty strong.

When you changed props did you do any adjustments to the strut? Sometimes a particular adjustment will work for one prop, but not another.

Thanks Dom. From a few days ago when I swapped all the electronics, its only been on a 642, until the last runs today. I figured if it runs so well on the BJ, it should be pretty close to right on this hull. Guess I was wrong. 38.1 was it w/ the 642. Three days of adjustments and thats the best I could get... until the 442 @ 39.6mph. (the BJ question about props I asked you earlier is what made me try a smaller prop on this one) And again, I havent adjusted the strut w/ the 442 yet, thats tomorrows project.

[domwilson]

Don't rule out the X637 in your tests. Throw that one in the mix also.

[tiqueman]

Don't rule out the X637 in your tests. Throw that one in the mix also.

I thought about that... Another one for tomorrows trials. I really would like to get that 640 as well and try that out. I didnt make it to the LHS today, which I may have to hit tomorrow cause Im about outta tape! I went to electrical tape today. Not sure how well that will work in a blow over but... , I havent put this boat on its lid yet...