Good day all,
I am a long retired Brit who has lived on a Greek island in the Aegean for the last 20 or so years. We have no model clubs and no-one to discuss problems with so I looked at the various online forums. I was very impressed with the knowledge base on this forum, and honoured to be allowed to register.
I have been building and flying scale helicopters for a couple of years and have built a couple of static/display steam boats but I am a newbie as far as RC boats are concerned. I have just started building a 1/12 scale model of the Bluebird of Chelsea yacht from the Chinese kit.
So far there are no problems with the build. The Mayhem topic "Bluebird of Chelsea - My Winter Build" by jpdenver has been a great help and inspiration.
Before I start planking I want to specify the electronics. The kit came with a pair of Johnson 775 size brushed motors. The identical unit is on Ebay:
https://www.ebay.co.uk/itm/254604745274?hash=item3b47a01a3a:g:InwAAOSwsxVdflF~From that site the voltage, speed and current specs are as below:
Voltage:12V No-load speed:14000 RPM Current:1.7A
Voltage:18V No-load speed:21500 RPM Current:1.9A
Voltage:20V No-load speed:24000 RPM Current:2.1A
The propellers supplied are rather nice 3 blade 55mm dia brass units.
I intend to use separate ESCs controlled from my Helicopter FrSky Horus Tx and probably an X8s Rx
My immediate questions are:
- Where should I mount the twin Tx antenna? - They are rather short pcb types but I could change them for longer single dipoles. Where do you guys mount them, inside or sticking upwards on the cabin roof?
- What would be the ideal RPM/Voltage for those propellers on a scale boat of this size (1320mm)?
- What rating ESCs should I specify? Any specific units recommended for boats?
- What type of battery (LiPo, LiFe. NiMh lead acid etc) do you recommend and what capacity?
Any advice would be most appreciated.
Best wishes to all.
Cliff