supervee 27 leopard 4074 2000kv 6cell lipo

[fastblack]

My green supervee 27 has got some upgrades

I have had it for 2 years, i ran stock setup 4s lipo x642 42amp draw and 61kmph

i had a nemesis 3674 1200kv on 6s and turnigy 180amp esc x642 72kmph

and i had leopard 4074 1400kv on 6s and turnigy 180amp esc x642 75kmph

the wood on sides in hull is removed and servo is mounted in the back of the hull.
the big black box is also removed.

The new setup:

leopard 4074 2000kv on 6s kypom 35c 3800mah turnigy 180amp esc x437/3 detounge
and x440 2 blade detounge

today was first time with new setup.

ran it first with 5s on x437/3 it gave 72kmph everything cold

ALL runs below is with 6s kypom 35c 3800mah

my first run with x437/3 detounge was 86kmph 54mph on garmin GPS i was very happy with that.
everythin motor esc,batteries and caps deans all were cold

my second run with x437/3 detounge was 91kmph 57mph

my third run with x440 2 blade detounge was 92kmph 58mph

everything is cold and nice.

i am very excited the boat runs very smooth i thought it would be very bad in handling but it is ok at this speed =)
maybe i will move the CG a little forward at top speed its a little light in the front.

will try more speedruns too se if i can go even faster

this is a super setup by the way high RPM 6s and small prop and no problems with torque roll
everything stays cool the coolingjacket for leopard 4074 was not in stock so i stretched the original small aquacraft jacket on =) it works it wont take too much water pressure so i have put in a piece of small diameter pipe BEFORE the coolingjacket =) lowers the pressure.. even with this much too small coolingjacket motor is cold maybe 30 degree celsius.

[Make-a-Wake]

Sounds like a nice setup.....great speeds. At the size of the battery though, i would think it would get HOT and puff. A 5000 40c batt would really wake it up and not be so stressed........cooler too.

[fastblack]

Sounds like a nice setup.....great speeds. At the size of the battery though, i would think it would get HOT and puff. A 5000 40c batt would really wake it up and not be so stressed........cooler too.

maybe =) anyway i ran it again today the water was absolutely flat no waves
it was running like a train it was not shaky at all! no issues!

92kmph x437/3 detounge and the kypom 35c 3800mah (not the best in the world

my CG was 23cm from the rear of the hull

on flat water the boat was very nice too drive I think I will move the CG back too 21,5cm from rear of hull. get nose more up and get more air under hull = more speed until it flipps

[fastblack]

ran it again today

cg 21,5cm from rear of hull.

this did the big difference in characteristics, it got more bow angle so it flew nothing but prop touch water but it was more nervous when touching small waves. the speed was same at 92kmph. the x440 detounge vs x437/3 gave the same speed 1km more with x440 detounge but it was creating little more heat. and 1kmph is nothing so i guess it was just luck maybe the x437/3 will give more speed in another run.
the x437/3 detounge does not heat things up at all you can run whole battery no problems, the x440 detounge seems ok for speedruns but will heat things up a bit in constant running i think.

the 1,5cm cg more bakcwards and the boat was flying even more than with cg at 23cm but it just looks cool it makes the boat more nervous and dont seem too give more top speed.

[fastblack]

PROBLEM: the flex shafts keeps braking and i loose my octura props... they brake where it is soldered....... do i need too rebuild the boat too 187 flex system?

[M3Bluegsr]

I think all the supervee flex shafts break there.. mine did the same thing at the same spot. I would pick up the ose upgraded flex shaft, its alot nicer than the stock unit. There is also the option of re-soldering the stock unit..

[Jacked1]

Hi, I was wondering if you know the amp draw when using the x437/3, I have a very similar setup I am going to use in my Villain (2000kv Tacon on 6s).

[fastblack]

havent datalogged it yet.. will do but i am rebuilding the boat for 187 flex

[Jacked1]

Okay, Thanks! Goodluck and Goodjob getting that supervee to go that fast!

[fastblack]

speed datalog

rebuilt it with hughey 3/16 187 flex..

ran it with etti datalogger

leopard 4074 2000kv
6 cell lipo 3800mah 35c
octura x438 detounge
turnigy 180amp esc with 2 extra caps.

5cell lipo= 60amps 1110watt

6 cell lipo = 114 amps 2550watt with a amp spike at 131amps max. but 114amps is the constant current draw.

95kmph

i wonder why the two extra caps dont get luke warm at all? should they be ice cold in this setup?

[Rumdog]

FWIW....2000kv on 6s is not going to last.

[fastblack]

sv27

well last year you said 1400kv leopard 4074 @ 7 cell wont last

i have run it all summer on 8cell lipo and x440 detounge @ 95amp draw at 8cell in my DF33 top speed 100kmph. maybe 40 batteries or more.


and now you say leopard 4074 2000kv on 6 cell wont last, well i have run it about 30 batteries, and everything is cold amp draw is 115amps with x438 detounge at full throttle. the motor specs says 120amps at 6 cell max motor is cold.

i think you are a bit negative too high rpm setups...... they work just fine..

[Jacked1]

rebuilt it with hughey 3/16 187 flex..

ran it with etti datalogger

leopard 4074 2000kv
6 cell lipo 3800mah 35c
octura x438 detounge
turnigy 180amp esc with 2 extra caps.

5cell lipo= 60amps 1110watt

6 cell lipo = 114 amps 2550watt with a amp spike at 131amps max. but 114amps is the constant current draw.

95kmph

i wonder why the two extra caps dont get luke warm at all? should they be ice cold in this setup?

Thanks for posting your amp draw!
That is exactly what i wanted to know.

[Rumdog]

OK. The reason they work for you is that you use TINY props. Why not take advantage of the thrust developed by a suitable prop for your hull?

[fastblack]

sv27

OK. The reason they work for you is that you use TINY props. Why not take advantage of the thrust developed by a suitable prop for your hull?

did some testing BE AWARE dont buy kypom lipos!! they suck big time, mine is 35c 3800mah 133amps cont, 175amp burst, they swell up (get very big and hot) when amp draw is 115amps, thats super bad.

my x438 is cut down too x437 now..

when i used kypom seried too 6cell i got 94kmph

then i got some new hpi racing 3800mah 30c packs 3cell seried them too 6cell..
this gave a top speed 101kmph.

amp draw was 125amps. and the volt drop under load was much less than with the kypoms so the rpms under load was higher too = more speed,

i also had little caps temp problem with the kypoms, but with the hpi racing cells the temps were cold on all caps. the kypoms isnt able too deliver what they say..

rumdog: for racing maybe the 4074 1770kv would be better because then i could use a 40-42mm prop and get less cavitation. but for speed runs i have the feeling that much rpm and 37mm prop gives a more stable boat, less torque roll or what its called.. but the 1770kv with the right prop would also be interesting because bigger prop should give same amps and speeds at lower kv.. but the 2000kv can also handle a x440 prop at 6s but then you need 40c good lipos.. that would be insane for speed runs maybe 150amps at 22.2v and 3300watts or someting like that =) the leopard 2000kv motor is ice cold with the x437 at 6s...