Model Boat Mayhem - Forum

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: genesis cat  (Read 2328 times)

3838Derrick

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 55
  • Model Boat Mayhem is Great!
  • Location: Lowestoft, Suffolk
genesis cat
« on: June 01, 2019, 05:55:51 PM »


Hi all. I have a 36" genesis racing catamaran and I'm looking to fit it with twin brushless motors.Can anyone recommend what size motors I will need and what size props too.
Thanks, Derrick.
Logged

Martin [Admin]

  • Administrator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 19,056
  • Location: Peterborough, UK
    • Model Boat Mayhem
Re: genesis cat
« Reply #1 on: June 01, 2019, 09:05:53 PM »


What motor does it come with?

The Aliexpress says:

  Genesis 1122 Catamaran Racing Boat / Electric Brushless RC Boat Fiberglass with 3674 brushless motor KV207, 125A ESC with BEC

HobbyKing:
Spec.
Total Length: 1045mm
Width: 245mm
Height: 115mm
Weight : 2.5kg
Motor: 36-74Size 2075kv Watercooled Brushless Inrunner
ESC: 100A watercooled (Required)
Drive system: 4mm

Video on Utube comment:
 I have since put a Turnigy 4082 1500kv motor + 45mm prop in the genesis, it's very quick now!!
 Approx speed in this video 70km/h, with new setup 85+km/h
Logged
"This is my firm opinion, but what do I know?!"    -   Mayhem FaceBook Group!

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,506
  • Location: Blackpool
Re: genesis cat
« Reply #2 on: June 07, 2019, 08:53:22 AM »

Go onto rc groups theres tons of information on that boat there .https://www.rcgroups.com/racing-boats-electric-57/

Logged

3838Derrick

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 55
  • Model Boat Mayhem is Great!
  • Location: Lowestoft, Suffolk
Re: genesis cat
« Reply #3 on: June 19, 2019, 12:10:52 PM »

Thanks guys. Another question.....Looking facing the transom, which would be the best way to have the props rotating (Port clockwise & starboard anti clockwise or vice versa?
Logged

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,506
  • Location: Blackpool
Re: genesis cat
« Reply #4 on: June 24, 2019, 02:35:55 PM »

You need counter rotating props on a twin ,most cats seem to have them spinning inwards so you will need a left and right hand flexshaft and props .
Logged

Tombsy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 113
  • Location: Calgary AB
Re: genesis cat
« Reply #5 on: June 24, 2019, 08:50:19 PM »

Always wondered why counter rotating, the twin nitro hydros we run both turn the same direction. Is it to reduce prop walk?
Logged
Brian

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,506
  • Location: Blackpool
Re: genesis cat
« Reply #6 on: June 24, 2019, 09:40:04 PM »

If both props spin the same way your never going to get the boat running at its best as you will always be fighting prop walk etc . ALL real offshore boats including catamarans run cr props for the same reason .
Logged

Tombsy

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 113
  • Location: Calgary AB
Re: genesis cat
« Reply #7 on: June 25, 2019, 12:54:43 AM »

I guess maybe the big turnfins on the riggers and only turning right helps. Not like offshore where you have to turn both ways :-) .
 O.P. I built a Genesis with single Leopard motor, I upgraded the strut and flex to 3/16, did some cf reinforcing and I tried the rudder extension but I thought it performed worse in the corners with it and I changed it back.
Logged
Brian

3838Derrick

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 55
  • Model Boat Mayhem is Great!
  • Location: Lowestoft, Suffolk
Re: genesis cat
« Reply #8 on: June 25, 2019, 09:58:09 AM »


Thanks again for all your thoughts. I have now fitted left & right flex-shafts and props plus 2X 3674 brushless motors.
Waiting on delivery of 2 esc's ,then I can finally get her into the water!
Logged

3838Derrick

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 55
  • Model Boat Mayhem is Great!
  • Location: Lowestoft, Suffolk
Re: genesis cat
« Reply #9 on: June 25, 2019, 10:10:13 AM »


I think I should explain...
I've had this boat a while now with a single motor and she performed well. Due to eyesight problems, she did encounter some pretty heavy obstacles and ended up pretty much wrecked!!  So I decided to repair her and, as I like building more than I do actually sailing, I've gone with twin motors. Maybe I'm going over the top here (the wife says I am).
The eye problem has been sorted now (cataracts), so I can't use bad eyesight as an excuse for any crashes!
Logged

martno1fan

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,506
  • Location: Blackpool
Re: genesis cat
« Reply #10 on: June 25, 2019, 11:08:15 AM »

Lots of people have built the genesis with twin motors twin 36 series motors might be a tad overkill it depends on how many cells each as the boat sits very low in the water as it is so weight can become an issue . I know this from my own experience of my own 36" cat i build , some have done twin setups but most opt for single just because its easier .
Logged

3838Derrick

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 55
  • Model Boat Mayhem is Great!
  • Location: Lowestoft, Suffolk
Re: genesis cat
« Reply #11 on: June 26, 2019, 10:41:09 AM »

I'm going to start with twin 3s wired in tandem. I'll let you know how I get on.
Logged
Pages: [1]   Go Up