Does anyone run an ED Racer engine as power. Need help. During rebuild back to original engine i lost the manifolds. Silencers are in the exhaust of the boat so just need ideas on how to form the headers. Tried cutting half way across copper tube and silver solder to brass flange but realised the pipe obscures the chance to screw the manifolds together as they were before. Anyone come across this on their boat or any ideas.

Hi
Sorry for delayed reply.
It's not a kit, I built it from a set of plans I bought off EBay about five years ago.
Sadly that vendor no longer seems to be there.
Sorry cant be more help.
J

Hi I have a 52 inch fire tender as well do you know who made the kit or plans by any chance as I picked this up to restore ?

I restored the same boat recently and installed two mabuchi 775 brushed motors via a single cheap eBay 480esc and 12v lead acid battery. Props are 50mm and it really moves however I had to add water cooling as I over heated one of the motors. Run time isnt that great though - maybe 10 mins . If you understand brushless and have the budget then that is the way to go I think. I didn’t want to spend much and don’t use it enough to justify the cost of brushless. I pulled the motors from an old hitachi drill!

Thanks

Many thanks to all for the replies.
I have had loads and have lots of food for thought.
Cheers
J.J

Thanks again to all who sent me info
J.J

Hi J.J.
I see you are not far from me at S.O.T., I'm in Sandbach and sail with CreweMBC, are you with the Potteries Club at Westport Park? You are welcome to come and visit any Monday or Wednesday afternoon, details are in the Boat Clubs and Lakes section on this site.

There have been several replies so far and I prefer the last para of CB90's post:
"My own fast patrol boat is 52in long and 12 in wide currently uses 2x 2826 brushless outrunners (fan cooled) 900kv 60A max at 3S (11.1v) with 2xwater cooled 90A Flycolor ESCs.
The motor run a little hot so need to reduce the size of the propellers from 45mm." with 35/40mm props your model will fly and expect 40min plus per run.

LiPo's do need to be handled correctly and you need a LiPo charger using a balanced connector to avoid overcharging and an ESC that will cut the power when the voltage drops below 3.5v. If you are not using the battery for some time then you need to store it at 3.7v per cell and a good charger will have a setting to enable this. I use the Giant Power Intelligent Balance Charger G6AC 50W 6A 12/220V.

Keep your build light and be prepared to add some ballast when testing.

Good building and please post details when more advanced
dave976

I have the 47" with a single prop - Turnigy 5045 - 660 KV turning a 40mm twin blade prop, power is Turnigy High Capacity 5200mAh 4S 12C LiHV Pack
ESC - Hobbywing Seaking 120A-V3 Speed Controller
It planes easily and last for 20 -30 minutes dependant on how you sail it
check out my build blog
https://model-boats.com/blogs/37275

Good Advice, Roy
Obtaining the right power train can be daunting and expensive.
Trev

Well JJ, your boat is looking good, but 60mm props seems a bit to big, I would expect either 40 or 45mm to be plenty big enough.
As for motor the majority of modellers use brushless and lipos these days.
But I'm still old school, brushed motors and lifepo batteries.
My choice would be a pair of 600 motors and a 12v 7ah battery.
But as I said, that's just my opinion.
Cheers Colin.

J.J, if you are using brushed motors I would suggest that you use a 12volt Duracell battery and it needs to be placed fed under the bridge. The stern will dig in and cause water to come in. You need weight well fwd to compensate and still make sure the stern well is pretty well water tight. I am also building same vessel and have a 36” version which planes well but fills stern with water at speed.

Hi
Well motors batteries and propellers are all a bit of a mine field, you will get a load of different opinions and ideas.
I give you my opinion!
I think you need two large brushless motors something like 2x 3670 with a low kv and water cooling. see
2x Electronic Speed controllers with reverse rated 150 A or more. I like the Flycolor 150A up to 6S.
Lithium batteries (Lipo) and charger.

You will need contra rotating propellers left-hand and right-hand.
I feel that 60mm propellers maybe a bit too big for starters as brushless motors tend to rev higher than DC motors.
I would start with a pair of 40mm.

Read up and save up before buying as this is an expensive hobby, the boat is normally the cheapest part.

RC gear
Motor couplings
Rudders
Water coolings jackets
water pickups and outlets

Be prepared to get bombarded with information and opinions.
My own fast patrol boat is 52in long and 12 in wide currently uses 2x 2826 brushless outrunners (fan cooled) 900kv 60A max at 3S (11.1v) with 2xwater cooled 90A Flycolor ESCs.
The motor run a little hot so need to reduce the size of the propellers from 45mm.

Your find help on this site!

Regards Roy