rcevolution
12-12-2010, 09:46 PM
So I got everything installed over the weekend. Got the Traxxas connectors wired up to the esc to run two sets of batts. I installed a HobbyKing 36-56 2700 kv brushless motor with built-in water cooling, a Turnigy 60a Marine ESC, Traxxas Micro 2.4 RX with Traxxas waterproof RX box. I used the stock drivetrain and servo. I did have to cut about 1/4 off the driveshaft and shaft tube though since the new motor shaft was so long. Batteries are 7cell nimh Dutratrax 5000. Prop is Octura X427. I also ran some new and larger diameter water cooling tubes.
By the time I was able to take the boat out it was almost dark :( GRRRR. I got a chance to make some slow test tuns to check for water leaks both in hull (which I just resealed with tclear waterproof caulk) and in water cooling tubes. After 2-3 mins at slow speed I had a nice jet of water from the outlet and no water in hull! So then back out and I took her up to half throttle maybe about 20-22 mph. Back and forth for about 3 mins then brought her in to check temps and everything was nice and cool! So I decided to give her some more juice this time. Now keep in mind its getting very dark now and the wind is blowing away from shore so if something goes wring Im screwed. lol I roll on throttle slowly and got to about 3/4 throttle and I was doing 30 mph+ and it was handling great. Turned it around for another pass, got to 3/4 throttle and 30+mph (guessing) and I started hearing the motor revving real high and boat slowing down when it did this. Something was slipping. Maybe some or alot of cavitation but im still not sure what the hell that is lol. Next pass same thing but more spinning/slipping, kinda like the sound and auto transmission makes when its going out, alot of revs but very little movement.
At this point it was almost too dark to continue so naturally I decided to push my luck lol. The last run I gave her more juice at start up and it slipped a little but got up on plane then I floored it. Got to about maybe 40mph when she just reved up full slippage and it stopped. I was giving throttle now but no movement at all, just some splashing under the hull. GREAT...
I waded out a bit before it blew away asI was keeping her close to shore and got the boat. Brought her in and luckily it was just a set screw that had come fully loose on the u-joint allowing the propeller shaft to slid out. Thats why it wasn't moving and that must of been what was spinning/slipping during alot of the test run. Oh well, easy fix, but it was very dark now. Next time in the daytime i'll get some video. I have alot of playing around with battery placement and adjusting the outdrive. But all in all it looks to be fast, sits nice and even in the water and RAN VERY COOL!!!
Video is of second run last weekend.
Video Link Below:
Um0adaGW4yE
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14805_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14803_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14806_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14808_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14802_.jpg
By the time I was able to take the boat out it was almost dark :( GRRRR. I got a chance to make some slow test tuns to check for water leaks both in hull (which I just resealed with tclear waterproof caulk) and in water cooling tubes. After 2-3 mins at slow speed I had a nice jet of water from the outlet and no water in hull! So then back out and I took her up to half throttle maybe about 20-22 mph. Back and forth for about 3 mins then brought her in to check temps and everything was nice and cool! So I decided to give her some more juice this time. Now keep in mind its getting very dark now and the wind is blowing away from shore so if something goes wring Im screwed. lol I roll on throttle slowly and got to about 3/4 throttle and I was doing 30 mph+ and it was handling great. Turned it around for another pass, got to 3/4 throttle and 30+mph (guessing) and I started hearing the motor revving real high and boat slowing down when it did this. Something was slipping. Maybe some or alot of cavitation but im still not sure what the hell that is lol. Next pass same thing but more spinning/slipping, kinda like the sound and auto transmission makes when its going out, alot of revs but very little movement.
At this point it was almost too dark to continue so naturally I decided to push my luck lol. The last run I gave her more juice at start up and it slipped a little but got up on plane then I floored it. Got to about maybe 40mph when she just reved up full slippage and it stopped. I was giving throttle now but no movement at all, just some splashing under the hull. GREAT...
I waded out a bit before it blew away asI was keeping her close to shore and got the boat. Brought her in and luckily it was just a set screw that had come fully loose on the u-joint allowing the propeller shaft to slid out. Thats why it wasn't moving and that must of been what was spinning/slipping during alot of the test run. Oh well, easy fix, but it was very dark now. Next time in the daytime i'll get some video. I have alot of playing around with battery placement and adjusting the outdrive. But all in all it looks to be fast, sits nice and even in the water and RAN VERY COOL!!!
Video is of second run last weekend.
Video Link Below:
Um0adaGW4yE
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14805_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14803_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14806_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14808_.jpg
http://i237.photobucket.com/albums/ff10/evofan74/745074902_photobucket_14802_.jpg