Blackjack 26 Dual

[blackcat26]

After seeing Mudl's twin and Cog's twin I decided to try my hand at one. Went fairly cheap with turnigy Aquastar's and Turnigy 36-50-3300 motors on 3s lipo's per side. Props were s/b x442's counter-rotating with the Sv27 stingers. My port side motor was for a lack of description rattling instead of reving. I made few passes and gps'd at 61.1. I'd like to put new motors on without going to Neu's. My choices are Ammo and Feigao. Any idea's for hitting 70 and above?

[blackcat26]

Here is the link to my video. I realize the motors im running are not exactly the right ones but still did decent when they worked! http://www.youtube.com/watch?v=bKl97-zWwgc

[blackcat26]

Anyone have any ideas??? I know I didn't post pics during the build....sorry I was in a hurry to get running for the long weekend!

[tiqueman]

Just finished a twin HOTR w/ 540 10XLs on 6S, (2 3S seriesed the parallelled to each ESC) and with out adjustments or trying yet, 3rd run went 66.7. So 70 isnt far off and shouldnt take too too much to get to. Its on 120A Turnigy ESCs and is pulling about 90A per system. Set up (wiring) is identical to Mudls and is actually who I extensively talked to about the set up. Its what he recommended it it works beautifully. I would think in a BJ being a little smaller hull, you would be closer to or even at 70.

[obrien008]

I would go with the 540's as well, maybe only 540L's though since the XL's might be a bit too heavy for that 26''. I like that rudder you have, where did you get it?

[Make-a-Wake]

Feigao 540 8L's are 3200 kv................36x60mm, maybe 8L or 9L for 3s

http://www.offshoreelectrics.com/pro...i-540L&cat=116

[blackcat26]

I was wondering if a lower kv motor with a little more power like the "L" series would wind out better. Those turnigy motors were deff. not up to the task at hand. Should I go with the 2800kv or closer to what I had at 3200-3300kv? Rudder was homemade at work with a breakaway Titanium blade for giggles.

[blackcat26]

Just finished a twin HOTR w/ 540 10XLs on 6S, (2 3S seriesed the parallelled to each ESC) and with out adjustments or trying yet, 3rd run went 66.7. So 70 isnt far off and shouldnt take too too much to get to. Its on 120A Turnigy ESCs and is pulling about 90A per system. Set up (wiring) is identical to Mudls and is actually who I extensively talked to about the set up. Its what he recommended it it works beautifully. I would think in a BJ being a little smaller hull, you would be closer to or even at 70.

Interesting wiring....Is that just to make the entire system more consistent voltage wise? I just wired up each batt to each esc but your way seems way smarter.

[obrien008]

I would personally go higher volts, less amps. So ya a lower KV would be better maybe around 2300-2400KV on 4s, thats what im doing for my current project which is also a dual setup.

[blackcat26]

I think you may be missing the boat here... lol I'm gonna run 3s to each motor not 4s to each. That would be way to heavy! So sticking with 3s per side anybody have any more suggestions?

[Rumdog]

Tiqueman runs his packs in a series, then parallels the power to each esc. Therefore he is actually getting 6s per motor. This could also be an option for your setup How many mah are your packs? C-rating? Cupping the props for more pitch will add lots of speed as well. If deciding between ammo and feigao, I'd go with the ammos. They are more efficient.

[blackcat26]

Ok I see about the battery pack now. I misunderstood what he said and thought that he was just paralleling everything together so that both batt. packs would be in sync. Well in that case I could possibly use my 2 bj 26 motors right? Packs are 5000mah flightmax 40c 3s.

[Rumdog]

The stock BJ motors would be a great choice on 6s, And those packs will have plenty of power to pull it off.

[blackcat26]

I may try that. If I pulled 61mph out of her on her maiden, what do you think this setup would reach?

[tiqueman]

I may try that. If I pulled 61mph out of her on her maiden, what do you think this setup would reach?

I dont think 60mph is an unrealistic expectation. I ran a 32" single cat on a BJ motor on 5S and went 49.3.. but then blew up the BJ ESC. I have found that 4S to 5S depending on set up adds about 8 or 9 mph. I have had that consistance w/ 3 different boats. So if 6S, in theory gets it almost to 60, a twin will easily put it over the 60mph mark. Just keep an eye on those motors.

Interesting wiring....Is that just to make the entire system more consistent voltage wise? I just wired up each batt to each esc but your way seems way smarter.

Its wired that way to get 6S as well as each side always sees the exact same voltage input.

Tiqueman runs his packs in a series, then parallels the power to each esc. Therefore he is actually getting 6s per motor. This could also be an option for your setup How many mah are your packs? C-rating? Cupping the props for more pitch will add lots of speed as well. If deciding between ammo and feigao, I'd go with the ammos. They are more efficient.

I need to learn how to cup props.... I want 70!!!