Osprey Offshore Endurance Boat

[Peter A]

Well it is time to put up a thread about my latest build. Some might just find some interest as this is I have gone a different way from the norm with this one. The idea is to build a boat that I can compete with in pour Offshore racing series here in NZ. All the boats currently running in it are gassers and races are typically two x 20 mins, and a 1 hour race. After the success of electrics at the Paris 24 hr endurance last year I figured that this is doable. I am also so fortunate that our national committee has allowed me to compete in the series with an electric boat (I know there was an almost total resistance to it though, but they couldn't really say no however!)
So although my preference would have been an Aeromarine Challenger 43, I ended up going with a HobbyKing Osprey as it was on special and came with all the hardware.
First job was to gut the hull and remove decals and hardware.

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[Peter A]

A layer of carbon in the bottom before going on holiday over Christmas new year, as well as filling the stuffing tube hole and redrilling about 3mm higher to reposition the stinger. After returning from holiday it was back into things, with fitting the motor mount, esc and steering servo mounts, making and fitting battery tray. Glue wait, glue wait! Refit harware.

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[Peter A]

As I did not want to be taping the hatch between runs, I decided to make hatch bolts and put a hatch seal on. This required a little bit of lateral thinking but worked out.

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[srislash]

If this runs as well as it looks it will be great.

[Peter A]

If this runs as well as it looks it will be great.

Just wait....

[Peter A]

Ok so everything installed. Motor is a TP 4060 580kv, ESC Hobbyking YEP 180, 20kg waterproof servo from RCBB. I had to make extra tie down rails for the big batteries that this boat will be using, 16000 and 20000 mah, 10S. Prop Prather 240.

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[Peter A]

The goal here was 65 kph and amp draws of 45-50 amps. I got a first couple of runs in today with some Revo GO packs, 1 each 4 and 6s series for 10S. Here is a screenshot from the RCM telemetry. It took give or take 3700 mah to charge the batts back up, which works out at an average of just under 50 amps. Bearing in mind that most of the gassers I will be up against are running at around 70 kph in open water this is looking good so far. More testing next week.

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[srislash]

So you have a good goal. Man I love it. Looks very promising! Almost 4km travelled. I’m beginning to dig thisRCM.

[Beaux]

Nice looking rig, how do you like the quick change motor mount?

[Peter A]

Nice looking rig, how do you like the quick change motor mount?

I have liked the quick change mount since I saw a FB post from OSE of the original printed model. This is the first boat I have been able to utilise it. I would like some spare front brackets too, just the bit that the motor bolts to. That would make changing motors even better. I could run this boat Q,S or T then!

[Beaux]

Yes , they do look pretty handy.

[SCARAB33]

Hello
I am surprised to see such a subject on a forum and that it makes others want to do as we do, endurance races in electric against heat.
cool .
at the 2017 edition, I was part of the team that won this endurance race as manager, it's a great team victory and for the world of electric.
it's been 3 years that we are working to arrive at the result of 2017.
in 2017 there were only 2 teams in electric.
*!** this year he will see at least 3 to 4 teams including mine for 24h.

your subject is top.
good essays and wish you to achieve the same results as us.

laurent

[Peter A]

Hello
I am surprised to see such a subject on a forum and that it makes others want to do as we do, endurance races in electric against heat.
cool .
at the 2017 edition, I was part of the team that won this endurance race as manager, it's a great team victory and for the world of electric.
it's been 3 years that we are working to arrive at the result of 2017.
in 2017 there were only 2 teams in electric.
*!** this year he will see at least 3 to 4 teams including mine for 24h.

your subject is top.
good essays and wish you to achieve the same results as us.

laurent

Thanks Laurent
It was the success at the 24hr event that inspired me to give it a go. Trying to get FE racing happening here in NZ has been slow. Too many fossil burners. For some reason people are reluctant to go the FE route with boats, yet with cars and planes they are dominating. For sure the lack of availablity of suitable lipos and the cost plays a part, but money is not the only problem. The whole cost of doing this boat, including over NZ$1k of batteries is still no more than building a gasser.
Anyhow this year will be a learning curve. I suspect the weak link may still be the esc, even though current draws are low, residual heat build up may cause problems. I am not too sure about the HK YEP 180 as some of the fets look like they are bulging already. It could be that it was a waste of money and made from cheap/recycled/ rubbish components. I have the 120 amp version as a back up but figured the 180 being a lot bigger would dissapate heat more readily. It could come down to quality. This would leave my options being the Seaking HV 130, or Swordfish 240 or 300 amp esc's, maybe a flier if it can be sourced at a reasonable price. I just need something that will run for long periods without self destructing!
Last club day I ran my Pursuit (TP3630 1500kv setup) for a 20 min race, won it as well, even with a flip and retrieve and battery change, lol loved that!

[SCARAB33]

Hello
we used the seaking hv 130, no problem with in 12s 16000.
currently I use it is very good job in my boat.
no problem of overheating (water circuit for esc and another for the engine).
hull of 1m20 and a weight of 10 kg.
I agree with you on the batteries, this is the weak point of the discipline, it is expensive in large capacity.
photos 24h 2017
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my boat DSCF0154.JPG

[Peter A]

I have invested in HK multistar 16000 and 20000 mah packs 4s and 6s to series and 10s. Ihave the 16000's already, and should see the 6s 20000's this week. At this point the 4S 20000 packs are unavailable to me and I will probably have to buy 10000 mah packs and paralell those to make up to 20000. To be fair they are not too expensive, but supply is more of an issue. I can only get what is in stock from the HobbyKing Australia warehouse. The shipping is resonable cost wise, but even though they say 8-24 days, it will take 24 days. The carrier holds the packages and will only deliver on the last due date. No customer driven efficiency there!
The esc I will have to see if it lasts. I may add cooling plates to the 120. Time (literally) will tell. I will have to weigh my boat. I think the 20000 batts are 4kg on their own, the 16000 around 3kg. I have built the boat heavier then I normally would to allow for the extra weight and it's impact on the hull during running.