aquajet 775 prop selection

[bobswworld]

reply to mocars

Well initially when first got boat it run very well for about 3-4 minutes and would die off abruptly after that, then I charged the batts at what the mrc 959 picked for settings, on ac power they would take if I remember right around 20-30 minutes for each pack but on car battery it would take 51 minutes each pack, I only charged them once from the car. When I did though it seemed to be the best run ever, however the batteries really heated up, controller and motor was fine.
The next time at the pond was not good at all, thats when it run only 30 seconds and died off.
Thanks for the reinforcement on cycling the batts, from reading around thats what I figured it needed. Will try it. How did you know it was on ebay? I have bought some gp3300 to try, just waiting for them.
I am thinking of making only 7 cell packs that way I can use them in my hammer as well, the hammer ran very well on 8 cells but got hot real fast. The 775 ran ok on the 12 cell nicd but once you experience the 16 cell speed how do you go backwards??
I am still having trouble getting the FECALC to take the jeti 600 navy, tried inputing info where suggested Reddywatts but when I open I get error, do you happen to know the exact info I need to input?
Thanks to all

[mocars2]

Well I was off on the 10v seemed ok for an 8 pack. I just finished charging a 7 pack of GP3300 at .5a and it took about 6+ hours and was showing 10.37V at the end from my Pulsar Sport. After letting it cool down for about 10 minutes, I put a meter on it and it went down to 9.97V. So my guess for an 8 should be 11.5 or better.

I remember seeing your boat on Ebay but I can't remember what you got with it or what you paid.

On the GP3300 that you're getting, I think I'd make the 7 packs too esp. since you have another one you can use them in.

[bobswworld]

Yeah when they are fully charged they read over 11 volts. Yesterday I rigged up something to discharge them, it took awhile for just one pack, used two regular light bulbs they heated up but of course did not light, I would say it took about 6 hrs for the voltage to come down even to 9.6 volts but then started falling off more rapidly, stopped it at around 8 volts. What is the science here? should I discharge more rapidly/higher mah draw? It was on my meter showing only 2.29 ma draw, now I am not an electrical person so I probably should know more.
I recharged one pack, should I only charge at lower amps? my charger picks 3.0 maybe by default.
Got the boat with the setup as in pics, mrc959 charger and a radio, overall am very happy with it. They had the steering set very short so it would take the entire lake to turn, but I moved the rod out 1 or 2 holes and now I see why it was set that way, got to be careful and slow down a bit to turn, otherwise it will grab and then spin out, but it is more fun to control this way.
Later for now
thanks for all the help

[mocars2]

You never told us what brand and Nimh OR Nicads and are they 3300 or what? So you didn't get these in the auction - you got them yourself - are they new?

you said you rigged up a light bulb to discharge them - a house 110V light bulg or what. A standard turn signal or tail light 12v bulb works great. So what was yours.

[bobswworld]

The batteries came with boat, they are powerizer 3300 8 cell packs, SJFE says they are not good, and Steve says they must have high internal resistance.
It was a 110 bulb, did not have any extra 12 volts around.

the other batteries I have coming are gp3300 used, if they fail I guess I could sell all the junk and then go buy good new. Just starting out.
Just missed out by 1 dollar on a new jeti 600 because the wife let me sleep in. I want to make this hammer insane, just because it is there. I like the way it runs and turns and how fast it was on 9.6 volts, it had the two 8cell powerizer in parallel so it sat a little low in the water but it took out like crazy, only ran it for a few moments as it was way over voltage and it got quite warm.
Kinda off subject, I discharged and charged those batteries 3 times each but have not had the time to run, maybe next weekend!!

[mocars2]

The batteries came with boat, they are powerizer 3300 8 cell packs, SJFE says they are not good, and Steve says they must have high internal resistance.
It was a 110 bulb, did not have any extra 12 volts around.!!

I'd go to Walmart or autoparts store and get a 12v bulb for what a buck - that would work better and when it starts to really dim - it's done.

the other batteries I have coming are gp3300 used, if they fail I guess I could sell all the junk and then go buy good new. !!

I have a bunch of GP3300 and have been really happy with them

Kinda off subject, I discharged and charged those batteries 3 times each but have not had the time to run, maybe next weekend!!

which batteries are talking about here?

[bobswworld]

Sounds good, the batteries are powerizer 3300 nmh, I keep forgetting to say what chemistry.
The nicads I have are 6 cell venom, have had no problems with those.
Have not received the gp3300 yet.
Yeah I was getting tired of checking the packs every hour so I did not discharge to much. The 12 volt bulb would be easier.

[bobswworld]

Hello, I believe you guys have helped me out here!!
After cycling the powerizer 3300 batteries 3 times they ran great today!! very good speeds and long run time, do not know exactly how long but considerably longer.
Also the gp3300 came in and I built two 7cell packs and cycled them, they were used.
Installed deans on all the packs even the powerizers.
the gp's ran well also but not quite as fast as the 16 cell powerizer setup.
overall it was a good hour of play.
was having so much fun that I had my first flip over with the aquajet, I was like oh know you didn't. It has sealing tape and such and hatch is held down by two thumb screws but even so by the time I got the fishing rod and retrieved it it was more than half full of water. But after all this it was still going!! put it back in the water and runout the batteries!!
Thanks all, hope I will learn enough to help someone

Oh yeah wanted to ask about turning fins/boards or what have you for an aquajet, it seems to turn slow at first but then it spins out, I have to slow down and really watch it in the turn.
thanks again

[hookedup]

turn fins

mine has these, OSE sells some for like $5. i thought the Aquajet came with them stock, but i see that these are kyosho and the ones on my boat look exactly like these. they work really well for this boat, noticable difference.http://www.offshoreelectrics.com/pro...rod=kyo-94241b

[bobswworld]

Thanks, guess I haven't looked around enough.
If they did come with I do not have them, bought boat used.
Will these help keep the boat straight in a fast straight run? it likes to wander a little as she is coming up to speed but you can counter it with remote. seems as if they might make it more stable. I cannot imagine going much faster with this boat, you really have to watch what you are doing (I am new to this)
I must make a list and order from this site!! The bug is biting

Hookedup
What prop do you run in your aquajet and what setup?

thanks again

[n.h.schmidt]

Hi
I have worked on one of these boats and think they can be a lot of fun. If you want to go faster and have longer runs ,shift the batterys back. You will have to stand them up to do this. About half the distance between where they now are and the hull transom. You can pick up about 2 to 3 mph . Even more speed with them farther back but turning becomes a problem with that. A tun fin helps with the turns too. This hull runs very wet as is and that really adds drag. The boat I worked on now has a 800 and runs at 26mph+ with 12 cells . Long runs of 6 to 7 min with 3300s ,little heat as the motor isn't being worked hard. Could last forever. n.h.schmidt

[bobswworld]

mine has these, OSE sells some for like $5. i thought the Aquajet came with them stock, but i see that these are kyosho and the ones on my boat look exactly like these. they work really well for this boat, noticable difference.http://www.offshoreelectrics.com/pro...rod=kyo-94241b

I see you have one for each side, but I do not see only the one listed, are both sides available hookedup? guess I could email OSE

Thanks n.h.schmidt
I was experimenting with turning the batteries around putting the heavy side forward helped in stability and turning it seemed. With 16 cells it really goes fast enough for me, I am sure once I get used to it I will want it faster. Did only run 14 cells this weekend and I flipped it, so I guess 14 is enough also.
Good info though I will try it!! this is half the fun, by the way what prop do you run with an 800? I was wanting to try a smaller diameter than the 2317/42 to reduce amps and heat with 14 or 16 cells but this last weekend the batteries barely got hot at all. so not sure what to do.
thanks
Bob

[mocars2]

I think it's been suggested with 16 batteries (fast but cuts down on it's life) a 40mm Carbon fiber; on 14 batteries a 42mm CF