HELP!! with recreational FE tunnel build

[Mulisha]

So biggest question what kv should I run its 36" going 4082 5s 1600 1650 or 1800 was going with 200 swordfish or should I step up to 220 or 240?

[HTVboats]

So biggest question what kv should I run its 36" going 4082 5s 1600 1650 or 1800 was going with 200 swordfish or should I step up to 220 or 240?

At one point I would have recommended 1600KV for a 5S setup. The more I run Q motors I find 5S just adds amps. 6S will allow some head room with a 200a speedy. 5S and 3500watts can pull 190amps where 6S lowers it to 158. Adjust your KV's to 1250-1600. Lower will give props a better range and more run time. I ran a 1250kv 4082 Leopard at the Charleston race on 6S with an m545 prop. Going to 1600kv I drop back to an m445. That is an all out heat race trim so I would recommend the 1250 with an m445 or lower to be safe. All with a 200amp Swordfish. Big KV's (1800) mean you have to run small props which may not carry a 36" hull.
Mic

[kendt]

I ran my HS 45 on a turnigy 4074 1400kv on 6s. I was using a turnigy 120 esc. (looking back not the best choice). It seemed fine until I went over 445 and then things went south. It was actually the motor that gave out first and it took out my esc. Made a hell of a mess he he.
The 200 sf is a good choice.. Like Mic says stay on the lower end of the kvs and you should have a good reliable setup. Just be sure to choose a motor that can handle some decent watts. I have a 34" kneeler that uses a 200sf esc and a t600 outrunner 1400kv. Its a great combination. Its quite fast and if i recall pulls around 140a.The boat is a little on the heavy side but that setup still works great.

[ChoppyOne]

Is there a magic chart or formula too use for example: i run a turnigy 3674 2200kv with a 4s 5000mah 40-50c and a aquastar 120 esc with 5deg of timing on my tunnel with a grim 44x68 and my temps are comming in at 92deg and the boat is not too fast. any help?

Dave

[kendt]

Are you looking for more speed? What size hull are you running.

[ChoppyOne]

Same one you are AQU TS3...... Im just looking for an explaination ...........more KV less prop Less KV more prop ?

[Mulisha]

Less kv more prop I think they say you should try and keep under 30000 rpm (kv x volts)

[ChoppyOne]

Thanks but i think there is more than that too it . I read about over 20,000 kv.

[Kris Flynn]

Dave, that size prop sounds on the bigger size for that motor...especially on a 120a speedy. I run a 1515 1y Neu 2200kv and it seems to like nodded 642 and similar on a castle 240 (hydra). Speeds in the mid 80's easily and equipment is a lot cooler than 92deg

[kendt]

Thanks but i think there is more than that too it . I read about over 20,000 kv.

Yes there is a lot more to it. and there are some factors that cant be predicted or calculated. After I burned up my esc and motor I got an eagle tree. Best thing I did. Takes out a ton of guess work. There is no magic formula or chart as you asked. You find a good starting point based on recomendations form others and then from there its a lot of trial and error.Or if you can manage it get a data logger.Its inevitable in our quest for greater speeds that some people will start experimenting with much higher rpm set ups.But not every size or type of hull is suitable for it, and its def not something i would ever recommend to anyone who hasnt aquired a decent amount of exprience with fe set ups. Those set ups are going to be much less forgiving.

[HTVboats]

Same one you are AQU TS3...... Im just looking for an explaination ...........more KV less prop Less KV more prop ?

A 3674/2200 on a TS-3 is a good match and should run 50's easily. I have run the 44X66 on that hull with a 2030AQ motor and esc.
Any pics of your setup layout might help us help you better.
Mic

[ChoppyOne]

Tunnel.JPGTunnelOB.JPGI think it is the motor, being a turnigy.. I ran a PB3630 1800kv with a 42x55AQ and the boat had serious low end but no top speed , i have a 2030aq coming in today .........the boat is CG at 8" the motor is .200 above sponson with a neg 5 . boat settles good in the corners and rides good in the water the faster the more lift. she may be running too wet. but i know the she is slow compaired to my revolt and it is all stock but the prop. it could be my lower unit it is a proboat lower.

[ChoppyOne]

so on higher (kv)rpms you would go with a smaller prop..........and lower(kv) rpms (torque) larger prop

[kendt]

[ATTACH=CONFIG]98515[/ATTACH][ATTACH=CONFIG]98516[/ATTACH]I think it is the motor, being a turnigy.. I ran a PB3630 1800kv with a 42x55AQ and the boat had serious low end but no top speed , i have a 2030aq coming in today .........the boat is CG at 8" the motor is .200 above sponson with a neg 5 . boat settles good in the corners and rides good in the water the faster the more lift. she may be running too wet. but i know the she is slow compaired to my revolt and it is all stock but the prop. it could be my lower unit it is a proboat lower.

Mine is set up approx 1/8 above the sponson and neutral angle. I will double check but i think my cg is farther back than that though. It runs great down the straights but bounces a bit in the turns. I need to tweek it a bit. It could be that yours does run too wet.

[kendt]

Nope I was wrong. My cog came out at 8in same as yours. So you may want to try setting your angle to neutral and see if that gets the speeds up.Mine absolutely flies with that set up