36inch twin cat build

[rcboatfan]

ya ok thanks guys! i will remake those bulk heads because when i put them together and looked at that i knew that wasnt right!! lol

[rcboatfan]

Yipes, is that blood you are spilling??

.

hahaha no lol

[rcboatfan]

k is this how the tunnle suports go because they dont line up with the stringers???? what is with this cat lol here are some pics

[Jesse J]

Maybe I am not familiar with the plans, where did the tunnel support come from?

[rcboatfan]

Maybe I am not familiar with the plans, where did the tunnel support come from?

they were on the plans

[rcboatfan]

should i just remake them and make them line up?

[rcboatfan]

ok i got everthing straighted out !!

[wolf IV]

You are just asking to blow your ESCs. It is all about trade off. you want size AND speed. If you don't care about how much you spend or how stinky your boat becomes after repeated fires, then you might make 50mph for a second then poof.

Your combo is not very conducive to FAST and RELIABLE. You will need either really hot motors, your 4S Fe batts and a hefty ESC. OR you will need 6S and a low KV motor that might work with your 100 amp ESCs.

Have you read any of the twin cat threads? You won't find any that run 100 amp ESCs, especially those that talk of your target speed.

Take Wolf, he has twin 2700 kv motors (very roughly equivalent to 6 or 7 XL) on 4S and what size speed controllers does he have?

Mine has two 1500 kv motors, eventually on 6S and I am thinking 200 amp controllers too.

The guys who are most helpful here are the ones that end up being most cautious... recommending larger ESCs that necessary, starting with small prop, checking temps often.

Save your Xpowers for smaller apps and save money in the end.

YEP JESSE IS RIGHT, IM RUNNING 200 AMP HIMODEL'S AND IF RAN REALLY HARD THE ESC'S STILL HAVE MELTED THE SHRINK WRAP RIGHT OFF DUE TO HEAT!! BUT MY PAYLOAD IS 12 LBS.....SOOOO IN MY CASE WEIGHT IS A HUGE FACTOR. AND THIS IS WITH X440'S!!YOU COULD RUN 8XL'S TO BE SAFE... GOOD LUCK BROTHER!

[rcboatfan]

YEP JESSE IS RIGHT, IM RUNNING 200 AMP HIMODEL'S AND IF RAN REALLY HARD THE ESC'S STILL HAVE MELTED THE SHRINK WRAP RIGHT OFF DUE TO HEAT!! BUT MY PAYLOAD IS 12 LBS.....SOOOO IN MY CASE WEIGHT IS A HUGE FACTOR. AND THIS IS WITH X440'S!!YOU COULD RUN 8XL'S TO BE SAFE... GOOD LUCK BROTHER!

so 8xl's and dydra 120's on 6s LiFe will be good??

[Jesse J]

No. I tried to elucidate two mutually exclusive scenarios:

1) low KV motor, high voltage moderately, low amperage
2) moderate KV motor, moderate voltage, high amperage

you have just asked about high KV motor, high voltage which would be screaming rpms and huge amperage.

Your original question was regarding 4S batteries. If you want to go with 6S then you really need to go with lower KV motors, like Proboat (1500 KV) which would work great in your cat, or 12XL (1450 KV).

If you stay with 4S theeennnnn you would be using 8XL and hydra 120s would be fine.

12XL or Proboat motor x 24 Volts = 33000 rpms
8XL x 15 Volts = 31000 rpms

8XL x 24 Volts - almost 50000 rpms.... Listen to Wolf's Elam hydro to hear what it would sound like... he has 2800 kv x 15 volts to give over 40000 rpms.

Also being limited to 42 mm props, you don't want too high of rpms, so take your choice and DO NOT MIX the two options.

[rcboatfan]

ok so 12xl's, 6s LiFe's, hydra 120's

[Jesse J]

I would give it my stamp of approval. The other benefit, is that you can step back to 5S or 4S if it goes too fast. I still think you would be more than happy with two Proboat motors, but your the doc, doc. They cost about the same new anyway - but Proboat motor has cooling jacket included.

good luck and keep us posted.

[rcboatfan]

I would give it my stamp of approval. The other benefit, is that you can step back to 5S or 4S if it goes too fast. I still think you would be more than happy with two Proboat motors, but your the doc, doc. They cost about the same new anyway - but Proboat motor has cooling jacket included.

good luck and keep us posted.

than you for all your help!! i i will definatley keep you posted

[rcboatfan]

now the hardware,

this rudder
http://www.offshoreelectrics.com/pro...e-502b20-black
these struts
http://www.offshoreelectrics.com/pro...os-stinger-str


.150 flex cables, 1 that pins clock wise and non clock wise

good?

[wolf IV]

No. I tried to elucidate two mutually exclusive scenarios:

1) low KV motor, high voltage moderately, low amperage
2) moderate KV motor, moderate voltage, high amperage

you have just asked about high KV motor, high voltage which would be screaming rpms and huge amperage.

Your original question was regarding 4S batteries. If you want to go with 6S then you really need to go with lower KV motors, like Proboat (1500 KV) which would work great in your cat, or 12XL (1450 KV).

If you stay with 4S theeennnnn you would be using 8XL and hydra 120s would be fine.

12XL or Proboat motor x 24 Volts = 33000 rpms
8XL x 15 Volts = 31000 rpms

8XL x 24 Volts - almost 50000 rpms.... Listen to Wolf's Elam hydro to hear what it would sound like... he has 2800 kv x 15 volts to give over 40000 rpms.

Also being limited to 42 mm props, you don't want too high of rpms, so take your choice and DO NOT MIX the two options.

i still havent learned jesse... i love the rpm's!!!! but riding that line always results in smoke!!!!!!!ive just got a 2600 kv mtr to replace her...went through two himodels