ProBoat's new 29" Mystic Brushless catamaran

[desmobob]

After a 5 minute run the temps are 89 degrees on the ESC, 100 on the batteries, 108 on the motor.
Is this the range of temps you are getting?
I had some very high temps at the connectors between the motor and esc (before I got my temp gauge). Two of the three motor wires actually fused together due to heat (shrink tube melted together). I recently swapped out all connectors in the boat to 5.5 bullets.
Last run I made of approximately 5 minutes with the new bullet connectors, I found that the connectors were still quite warm (112 degrees). In fact, the new heat shrink tubing I have on the new 5.5 bullets was smoking.... I hope it was the tubing that was smoking.

DD,
I'm still using my x640 and have yet to s/b/p my x642 to get it ready for use! I have temps +- 90/90/90 with the all-stock set-up and the x640. 40+MPH.

I installed a new Seaking 120A ESC last night and upgraded my motor connectors to 5.5mm bullets. When I desoldered the old bullets, I was surprised to see the solder inside all three of them was very dull whitish/gray, like a cold solder joint looks. The wires popped out of the old bullets very easily before the solder had really melted. I didn't have any problems previously but the condition of the solder joints looked awful. I've never checked the temp of my ESC-to-motor bullets, but you can bet I will now.

And to keep me worrying, my new solder joints were not up the quality I usually achieve. I ran out of my usual solder and used some very cheap Chinese 63/37 that doesn't have a flux core. I used No-Korrode paste flux and did an OK job, but the cheap solder just didn't flow like I'm used to. I have some better solder due to arrive tomorrow so maybe I'll do them over again....

The weather is hanging in there for us here; around 50 all week. Maybe some snow on Tuesday. My next chance to run the Mystic is on Sunday if the lake is calm enough. I have my fingers crossed!

Take it easy,
desmobob

[ecoovert]

Say DOUBLE D, I couldn't help but respond to your post. Pardon me for not going back and checking your previous posts as I'm very buisy these days. If you're running the boat stock the 5.5mm plugs should be plenty. I' ran my MG-29 last Saturday here with a 4082 Leopard motor using a 180 amp esc on 6s with an x645 prop with similar temps using 6mm plugs. The outside temp on that day was 62 degrees. My temps were 82 for the motor, 98 for the esc but I forgot to check the lipo temps. On that day I pushed her up to over 84mph. with that setup. If you care to would you tell me what you have in your Mystic? Is it stock or have you made changes? Are you running it on 4s or 6s? I will say that when I was using the Turnigy 120 amp esc with a 4074 Tacon motor the esc fried. Since Then I upgraded to the Turnigy 180 amp esc and have had no problems since and now my temps stay low.

Was using 30c-40c lipos before but just got in a set of 35c-70c Nano Tech lipos as the 30c lipos seem to begin swelling after too few runs. It will also be interesting to see what happens to the temps.

[tiqueman]

And say eco, id really like to see a vid of this hull going 84mph

What motor were you using?

[ecoovert]

Sorry about the poor quality of the video but here is a vid my nephew shot of the boat on that same day. This wasn't the actual speed run but it was moving along pretty well here. My problem is trying to find someone willing to go with me and shoot video as I drive my boat. But here it is the closest video of a speed run I have at this time. I think I was running it a little dry here.

http://www.youtube.com/watch?v=iu3FDsfhHJ4

[tiqueman]

Well if you got yours doing proved 84mph then your better than most on here because no one else can keep it on the water. Id really like to see consecutive times bouy to bouy or gps runs. Your runnin 55ish on your current set up. Ask me how I know? And put that set up on 4S in a race and see how your temps are. My 8mm bullets hit 220F. Running like you do youll never get hot

EDIT, just an observation, Im in no way bashing or trying to be negative

[Derrick Davis]

Eccovert,

Thanks for the input. My set up is stock except for the octura X642 prop (s/b/p). I'm using Turnigy 40-50c 5000 mah Lipo batteries x2 (4s). I want to do what desmobob did (and many others) and put in a 120a sea king esc, just haven't done it yet. There are quite a number of folks here that swear by having more "head room". I like this idea. Especially if it means reducing the risk of burning up electronics!
I am noticing that the flex shaft is seperating..... Wonder if this is causing excessive friction in the stuffing tube that is turning into heat in the electrical system?

Desmobob - I did order (and received today) the lead teflon sleeves from OSE. Very fast service from the folks at OSE I might add! If I get time this weekend I'll replace the bushings that are in there now with the new ones. I better order a new flex shaft as well. Darn, why didn't I think of that when I ordered the bushings.

[ecoovert]

I know how you feel. Whel I ordered mt 4082 motor from OSE I forgot I would need some 6mm plugs for the esc and lipos I ordered to go with it. I had everything at home and began on my project only to find out that all I had were 5.5mm and 6.5mm plugs. Worst than that when I did order the plugs to go with my setup I ordered 6.5mm plugs instead of 6mm plugs. Needless to say I had to wait another week to finish my project. I hate to say it but take it from me, it probably won't be the last time. As to the flexshaft I would go ahead and replace it if I were you. I always like to keep extre flexshafts and teflon tubing on hand as these are kind of like tires on rc trucks. They will ware out or break at some point.

Good luck DOUBLE D.

[ecoovert]

Tiqueman,

I havn't done it yet with the larger motor but I ran ovals at 80%-100% throttle on my older 4074 motor for about 5 minutes non stop and when I got her back the motor temp was 114 degrees and the esc temp was at 119 degrees. the plugs on the motor were only 5.5mm and I was using 6.5mm plugs between the lipos and the esc. Here is someone running the same motor as mine on a Genesis which is a larger boat than mine check his gps run out. That's the best I've seen done with a Genesis. Just because you didn't see it on youtube doesn't mean it can't be done. Check this out.

http://www.youtube.com/watch?v=hQq5va2_Q-A

[tiqueman]

Never said its not possible, but just because a Genesis will do it doesnt mean a Proboat hull will. thats what I was getting at.. and my point, you havent done over 84 w/ yours, youve done about 50, BUT!!! when you do finally runyours on that set up, you best be runnin that vid because all of us want to see it. I hope you acheive it. it will be a big day for the PB hull.

[johnf]

Eco I'm confused. You ran 84 with the big leopard like you originally stated, or is it not installed?

[ecoovert]

Here is a video from Justin otherwise known as jpriami. Here he is doing 63.8mph. with his "PB hull" Miss Geico using smaller motor. Im guessing he would have gone faster with a 4082. I know he didn't show his Eagle Tree gps reading here but he does have quite a reputation on these forums and I'll take his word for it. I also included a link of someone doing 75.4mph with a Blackjack 26. Smaller "Proboat hull". The MG-29 is a relatively new boat. That's why there are not many vids of this boat. How many videos are you findingng where people have enstalled a 4082 motor into this boat? That may give you another reason no one has posted a gps run at over 80mph. yet. Grant it My 84mph. run is based on the boat moving 620 feet in 5 seconds flat. I would have to be way off to have not at least reached a top speed of 80mph. as 620 feet in 5 seconds gives an average speed of 84mph. It does take time to accelerate so odds are I went even faster. My goal for posting the vid is I was asked to by others so I did. My goal was not to prove to the world that my boat hit 80+ mph. as I know it was at least in the ballpark. I was there I saw it and I'm content with that. As to weather or not the hull is capable of speeds higher than the mid 50s you may want to check these vids out. I admit the reason I don't gps my runs is I'm too cheep to buy a gps. All my money goes into my boats and hop ups and I aint gonna spend it on a gps, yet anyway. http://www.youtube.com/watch?v=4ai05uBpD0E http://www.youtube.com/watch?v=JzFcujV1BnA

[JackBlack26]

I would love to see the Geico/Mystic hull GPS or Radar at higher than 60s and stay flat. I have GPS/video of mine doing 59.8 with a Castle 2434 1800kv motor on 6s with a Prather 215 prop and I could barely keep it on the water. I'll post the link when I get off my iPhone. And just a tip, add about 2 pounds of self adhering lead weights to the underside of the hull, in front, right between the sponsons to keep the hulll flat or it will fly backwards faster than a toupe in a hurricane.

[tiqueman]

Eco, You have nothing to prove to me.. Ive seen and built many boats w. similar set ups and acheived high mph numbers. Blackcat abandoned his twin MG bc he couldnt get it much over 70 without it lifting and blowing over. It has been tried.. I have done my research. And look a little harder, theres vids of BJ26s doing almost 90. But, that hull has a lot less lift than an MG too. Im not doubting you wont get there. ive never said that. But I do doubt its going to just be a drop it in and go. And there are motors that size in many of these.. they are just called Castle and Neu. And have a lot better chance of getting there than a Leopard. (not bashing leopard, i love all of mine)

But again, I encourage you to get it dialed w/ your set up, keep it planted and eventually get some kind of gps device in it. And do several passes. Ive had gps's read 60mph in a boat I know does 40. ive also had it in a 70mph boat come in at 35. So one run proves nothing. 10 runs helps.

[tiqueman]

rafael, are you challenging me?????? I do have YOUR hull on its way to the sunshine state. 2028?

[ecoovert]

If you run a 2200kv. 4082 motor on 6s with an X645 prop and do the math the power plant is plenty to push the boat beyond 80mph. If you calculate 90% efficiency, 20% slippage, 48,840 rpm. and the total pitch of an X645 prop using the speed calculater this very site offers you come up with well over 80mph. Add to that the hull is only 30" long, Well you know where I'm going. I was able to take all of the above, put it into my boat and am able to run it at full throttle until I run out of lake with no blowover. I think we all know that with that setup at W.O.T. you'll be doing well over 70mph. It's all in the center of gravity, the strut angle, the offset rudder and everything being as close to perfectly balanced as possible. I know that many are finding out that if they simply move the batteries forward on this boat the boat handles very well. I even find that with the other adjustments the boat settles down at higher speeds once it really gets on plane. It took me a few blow overs to figure this out.