FC shocker motor suggestions

[ozzie-crawl]

Scott!! So good to see ya getting back into boats!!!!
I need more inspiration to get mine going.
Let me know when you go to run a boat, be great to catch up

Ryan

Hey Ryan great to hear from you.
I brought a proboat 29 a month back to get into it. Running 6s with a 1500kv motor it is a great little sport boat.
Hope some parts turn up this week to finish the genesis build and get it wet next weekend.
We have been running at emerald lakes. Not a bad spot.
Hope to catch up soon.

Scott

[Xcesive8]

Sweet that's awesome!
Yeah well give me a buzz if ya's go for a run.
Who ya boating with , Geoff?
Emerald lakes, is that where the sail boats do there lil course?
Ive narrowed down the fleet, only got the lil hydro I got off you or Geoff.
Then a few other cats, none that are running yet, need to finsh them..

What esc's you running these days?
any specific one your having luck with?

[ozzie-crawl]

Yea were the sail boats run. Geoff has pulled a few boats out of the shed and has a big 10-12s rigger in the works.
Orded a swordfish 200+ to try in the genesis hopfully it holds up.

[iridebikes247]

Keith bradley has the swordfish 220 esc for 6s operation I think its like 130 bucks. I stand by the whole 4s 2200kv its the WORST when you have a motor with low kv and can't go any faster. I made this mistake with my mhz mystic 138. I run 12s 730kv motors and even with x465 props shes slow. Perhaps slow because I'm comparing to my friends hpr 135 that runs 110mph on a slow day lol. Anyway kv is super important and believing you can just compensate with a big prop isn't too smart. The amp spikes become huge even if the constant current is within check with big props.

I think OTOH means on the other hand? The shocker is a sweet boat man and can handle very high speed. You asked about the proboat motor do you know its diameter? I feel like its a 3674 but could be wrong. Anyway that with 1800kv on anything over 5s I can't comment. BTW there is a site called hobbyhot.com you can get two leopard 4074s for like 130 bucks lol.

[ozzie-crawl]

Thanks for that info. The 1800kv pb motors are 36/60 and 6 pole. Was thinking 2 of these mite be enough for some sport boating in the upper 50mph area
But not sure. If not i could look at getting some 3674 leopards. The PBs would give me a little more room for battery placement.

[Fluid]

The ProBoat 1800 motor will work, but it is still pretty high Kv for 6S sport boating. The OP is not looking for 90+ mph speeds - he says high 50s which is certainly doable with the Shocker. Twin ProBoat motors with x442s will hit mid/high 50s on 6S when the boat is dialed in. But a better choice would probably be the larger Leopard 4074/1650 motors, they will swing x447s and give similar speeds to the ProBoat motors with less stress and better acceleration. There are many ways to meet the OP's goals with this hull, he just has to decide which to take.




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[ozzie-crawl]

Thanks Fluid. I decided to get a couple of 3674 leopards 1700kv motors. From steve with free water jackets :-)
Thinking 5s with the option of 6s ???.

[Fluid]

Good choice, they will certainly work. I'd feel safer on 5S, but 6S is an option as long as you don't get too greedy on prop size.

Remember that you can mount the packs on the tunnel, there is no downside to this. While some "experts" insist that the CG has to be kept low, my old club proved this to be the opposite in actual racing (with a bunch of boats switching pack placement aropund to see the results). This was on a very tight triangular course with sharp turns greater than 90*. My current oval racing cats have the motor and packs on the tunnel, and no one questions how well they handle. ;^)

http://forums.offshoreelectrics.com/...ht=#post495545



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[iridebikes247]

Why place the packs on the tunnel? Does it help the boat drift more than catch an edge and ride your line incorrectly? Thanks Fluid I'm interested in this my friend has a sprint cat 36 we're building and packs will likely be mounted in the center.

[ozzie-crawl]

It will be 5s to start and probably stay that way but at least i have the option.
Should i start with 442s or could 447s be a option.
Thanks for your help so far guys much appreciated

Almost forgot with the speed i want to achive will carbon fiber reinforcement be a must.
Fluid i realise yourse did not survive but thats was a very high speed crash or are they very thin hulls

[Fluid]

Why place the packs on the tunnel? Does it help the boat drift more than catch an edge and ride your line incorrectly?

I don't know exactly why the weight on the tunnel works so well - "common sense" says to keep the weight low for better handling. Twenty years ago we raced 8-cell brushed Key West cats indoors on a triangular course with two 120* turns and a 90* all wide open at 30-35 mph (this was wild because if you drifted a bit wide - BAM - into the side of the pool!). When some of the racers put their packs on the tunnel they found that they flipped less and had lower lap times. We experimented with the packs in the sponsons and on the tunnel - and everyone ended up with them on the tunnel.

Since then I have built a few large cats with the packs in the sponsons, then moved them to the tunnel. I could see no difference in handling, they would all turn as tight as I wanted and never rolled over. Note that the Motley Crew has all its weight on the tunnel and handles just fine. Putting the packs on the tunnel reduces the amount of wire by quite a bit - less impedance to reduce ESC damage.

My Shocker was pretty thin, but it was an early production from 2011 - don't know how they are built today. Even Mark's carbon-fiber record-setter was severely damaged in several crashes. That is just one of the risks of going really fast.



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[ozzie-crawl]

Taken from the FC web site " These Specially Reinforced Fiberglass SAW Racing edition hulls are a*!**FighterCat Exclusive Limited Edition"
So hopfully they are a bit better.

[keithbradley]

My two cents:

1700kv on 6s is pretty standard "sport" RPM using twins (I most commonly use 1800kv motors in these applications). A bit on the high side with a single motor setup, but definitely not in a twin. 3674s will work well...I've taken a larger hull to over 100mph with 3660s (not saying it wouldn't benefit from larger motors, just that 3674s are large enough for sport running). Most of the cats I build this size for 6s are done with 4068s.

Here's what I think about lipos in the tunnel:

http://www.youtube.com/watch?v=87owPwmuMRM

[srislash]

If you want it to corner at least a bit "tucking" the rudder is most beneficial in planting the transom.Here is my build Ozzie: http://forums.offshoreelectrics.com/...hawn-s-Shocker
5s on my 1800kv's was good for all round boating.So the 1700's should be great as well.These hulls just look soooo good.

[ozzie-crawl]

Thanks keith i know you build a lot of twins. Have you seen the fibreglass version of the shocker and how it is layed up ??

Shawn i have read your thread about 6 times lol. Very informative thank you.