Osprey Offshore Endurance Boat

[Peter A]

Next years boat is the one in post #41. It is an AB Marine 46" mono that has been in our club since new. The website has vanished but there is still a FB page. The guy (Tony) has gone dark on a lot of boaters in NZ. Personally we don't get along either, but the hulls are good. I am up to prep and prime on the boat before getting it painted, then I will fit it out, the plan is to do that over the Christmas break. I will do a build thread when I am further along.

[srislash]

How did I skim over #41. Nice.

[Peter A]

I haven't updated this one for a while! Anyway I am still running the Osprey in our Offshore series. Last year my best was 5th place in a field of 19 boats in really rough water, rough as in 2 foot waves!
This year the boat is running a 12s setup with a TP 4070 440kv motor and Prather 245 prop.

The first two regattas of the year saw a 4th place out of 10, and just this last Saturday I managed 2nd out of a field of 13. I am totally stoked with the result as this is the smallest boat and the only electric against bigger gassers. I am not as fast as some, but electric has some advantages, mosty being less stoppages and rescues.

[srislash]

Excellent Peter.

[Brushman]

I am not as fast as some, but electric has some advantages, mosty being less stoppages and rescues.[/QUOTE]

Hello, exactly!

4 electric boats participated to this year 24h enduro race, and they did 1st and last was 6th!
-gassers can still beat electrics because they have enough gas, 1 hour, between refill but they have to work on less stoppages!

congratulations for your results, the Osprey is not the best hull but you did well!

Vincent

[Peter A]

Thanks Shawn and Vincent.
Vincent you are correct that the Osprey is not the best hull, but others, well most are hard to get here without forking out a lot of coin for shipping. I can get Deltaforce hulls no problem, and at a reasonable price, However I would really like either a Aeromarine Challenger 43, or a Dumas Scarab 45", or even an Apache or Cigarette hull around the 43-45" size.
BTW are Aeromarine still in business, people tell me they aren't?
I have a Dumas Scarab 30" hull that I have been thinking of measuring and scaling up to around 43", because that goes really well at around 55-60 kph with a basically 'spec' set up in it and would be awesome if it was 50% bigger! Then again I don't have a lot of desire to build any new boat atm, I have a Pursuit to strip down and tidy and repaint, and the Osprey will need doing at the end of this year, it is a little battered about now. It got run over (again!) by a 58" Apache on Saturday, but the bigger boat sustained more damage!

Also I knew the 24hr had been run but had not seen any results (obvious ones, I hadn't really searched for them). Great to hear that the 'leckies' won again. Still battling some anti attitudes here, including being told, in an email, by the NZMPBA Treasurer, that he is "sick of my persistence with electrics", and, "he and others would be happy if I left model boating"! Gets a bit discouraging at times.

[Peter A]

Well we just had our biggest yearly offshore meet at Lake Taupo (New Zealand's biggest lake). I didn't go so well this year, the water was really rough and the Osprey was sort of half boat, half submarine, even diving under and staying down for a good minute or so! I ended up with a broken steering servo mount in the second heat so scratched for the rest of the day, a bit disappointing but that is racing. It really was real concentrating racing in that water.
On the plus side I was pitman for one of my clubbies, who is finally back running offshore after giving up with his old nitro a couple of years back, and he won by a big margin of laps. So it was still a good day.
While the Osprey is really good in calm and mildy rough water (6-12" chop), over that it really struggles. So depending on whether I am going to spend up large on new batteries I think I will be looking to go with a proper deep V hull next year. My winning clubmate has a few moulds that I will have a look at.

[srislash]

Well that sucks!! But learn as we go eh? Umm perhaps the Watersnake hull or something like that? Just a thought for you. I’m going to build it’s little brother (the Rapide) this winter. Sleek V hull for waves.

[Peter A]

Hi Shawn
I have yet to decide if it is worth the time/cost of firstly building a new boat, and secondly if I will have the budget for more batteries. They cost me around $300 NZ each and I will possibly need 4. As much as I do enjoy doing the offshore, it is a lot of money for what is realistically for races a year. I can keep what I have just for club stuff as we do a 20 min race on club days. We shall have to see as we want to buy a house next year as well and need to save for that. I still have a bunch of boats to use and a JAE 33 to build as well as tidy and repaint the Osprey.
If I can find a decent mould here I might just lay up something and set up a boat and test it anyways, but with no rush on it.

[Brushman]

Well that sucks!! But learn as we go eh? Umm perhaps the Watersnake hull or something like that? Just a thought for you. I’m going to build it’s little brother (the Rapide) this winter. Sleek V hull for waves.

Hello,

do not go with the Watersnake, this hull is only good for straights...

[Peter A]

Hello Peter,

I think you will make a bigger boat? are 12 S allowed?
the winning boats are running 56-58mm motors with 400-450 kV, 12s 16000, Seaking 130HV, 60-65mm prop. 22-25lbs. these setups will give you 45-50 mph speed and 20-25 minutes, with 10- 20% left in the batteries. No turn fins (or little), no flaps. Gassers wil not like, because you will be on the podium at every race...

Vincent

HI Vincent
Can you expound a little more on these setups? Motor 56/58 x?, what kv? ATM I can do 20 min from 12s 20000 mah with the 4070 440 kv motor on a Prather 245. That is a full throttle for 20 mins, although I don't like to go below 20 min. Speed is 65-70 kph. I would really like to get 70-80 kph with the same current draw or less but fail to see how unless I am not running full throttle.
I could use my 45" hull to do this with just the right prop and motor potentially and 16000 mah packs which would fit the current configuration.

[Brushman]

Hello Peter,

this is difficult to help you, as you are not running the same circuit as we do. You should try first to simulate our 24h circuit which can make 450-500 meter and see what is your runtime. Just check some video's.
You can play with propellers by using a K propeller from Graupner , a K60 or a K63 will not load the motor too much. 70Km/h and 25 minutes runtime with the 20000 mah /10/15% left in the batteries should be possible. Going 80 with 20 minutes runtime on 16000 is for experts, and I never did that kind of performance. Some competitors are ready to spend 50 hours of practice to find the right motor, right prop, hull tuning to get these 3-4 extra minutes and 5-10 Km/h extra but I do not want to empty my wallet and I like to travel during my hollydays..

Vincent

[Peter A]

I found yesterday that TP has a 5660 motor at 440kv 6 pole. Might be one to give a try. After a bit of thinking I might go back to the 45" hull I have rather than go through the time and expense of building a new boat. It was the original plan anyway. It will not take much to change over to it, a few small internal adjustments is all from it's current set up. But not until later in September after our next two lap and oval winter regattas. Might put the Osprey back to 6S as I have a motor and it runs really well with that setup also. I can run the 45 at our 4 hour enduro in October.

[Turbotaz]

Any suggestions for setting up electronic to my 55? cat twin motor to go 60-90 mph? It?s a hand build fiberglass

[Peter A]

Any suggestions for setting up electronic to my 55? cat twin motor to go 60-90 mph? It?s a hand build fiberglass

With a twin the two motors can help each other load wise, and you can easily get 60+ mph depending on how is your setup. If however you want long runtimes 15-20 min, then your speed goals go down to the 40-50 mph range. Currently I am not doing endurance anymore. I still have my 45" mono with the endurance setup. With a K60 prop and 12s 6000 mah I can get 8 min runtime at 60 kph. I think you need to rethink your actual goals and what you want to achieve and enjoy the most, speed or runtime. Just my 0.02.