2017 Build Log - Jet Chopper 30 Hull

[Tamelesstgr]

More work trying to dial in the Chopper tonight, I've been fighting a bow bounce the last few runs, so today I moved the batteries a little bit further forward, and adjusted my inner trim tabs down a smidge. It seems pretty well settled in the turns which I like. Loaded RPM seems to hover around 26k and amp average about 100 when I look closely at the data logs. Might be time to prop up, or even try 5s?

https://www.youtube.com/watch?v=cyLERJ2YlsU

JC30 2075KV 4S G442 Prop 5-9-17 Amps Chart.jpg

JC30 2075KV 4S G442 Prop 5-9-17 Multiples Chart.jpg

[Tamelesstgr]

Finally some consistent logging has revealed logical results. I have been running a Graupner 442 - 2 blade prop as my baseline the past 6 runs, so I have some nice consistent data. I have been watching average amps and rpm curves. Tonight I jumped up to the Graupner 445 - 2 blade and saw some interesting changes (but expected)

442 = average amp draw: 100 amps, average rpms: 26,000
445 = average amp draw: 120 amps, average rpms: 24,500

Motor and esc temps were also up slightly, but the past 6 runs were averaging 60 degree ambient outside air temp and today it was 80 when I ran. Batteries were a little warmer at 115 degrees due to the system working harder (but still very manageable) for 2:45 run at WOT.

Amps 442 vs 445.jpg

RPM 442 vs 445.jpg

[Tamelesstgr]

Was toying a little more with the graphs and when I plot the RPM, Watts, Amps and voltage it's pretty neat to see:

On the left (442 prop) the RPMs (Green) hover around 26,000 rpms and the amp draw/watts output (Maroon/Orange) are lower.

On the right side (445 prop) the RPMs hover around 24,500 and the amp draw/watts output are higher above the RPM line.

Makes sense that the load of the larger prop drops the RPMs and increases the motor duty.

442 vs 445 Multiples.jpg

[wolffman]

hi how do you mark the holes? how do you know the exact position?

[wolffman]

Hey Gang, been saving up parts and finally got the Jet Chopper 30 hull in from Leo. Excited to do my first hull up build with a CF inlay.

Specs:
SSS3674 Brushless 2075kv motor running on 4S
Turnigy V2 180 Amp esc
TFL Running Gear (Trim Tabs, Turn Fins, Rudder, Servo Mount)
Speedmaster Stinger for 3/16 Cable
Reusing some items from the ProBoat Shockwave 26

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how do you know how to make the roles? Thinking about build one also, but first time builder !

[Tamelesstgr]

I located them ontop of the hatch, drilled the hole in the hatch, then marked the main hull with a pin. Be careful, the fiberglass can chip easily, don't use a bit that will bite quick.

[wolffman]

could not find jetchooper hull any more!!

Hey Gang, been saving up parts and finally got the Jet Chopper 30 hull in from Leo. Excited to do my first hull up build with a CF inlay.

Specs:
SSS3674 Brushless 2075kv motor running on 4S
Turnigy V2 180 Amp esc
TFL Running Gear (Trim Tabs, Turn Fins, Rudder, Servo Mount)
Speedmaster Stinger for 3/16 Cable
Reusing some items from the ProBoat Shockwave 26

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Hi i tried to contact leo ho, but i think he is not selling the jetchooper hull any more!
Do you know if he still seling? do you have its whatsapp? Thank you!

[Tamelesstgr]

I recall that I had ordered a red hull and he convinced me to take a stock hull he had available. Mine is currently for sale if interested.

[wolffman]

jetchooper

I recall that I had ordered a red hull and he convinced me to take a stock hull he had available. Mine is currently for sale if interested.

HI! I would take the hull and learn how to build!

Do you would sell your boat only the hull an hardware?

[Tamelesstgr]

Yes, i can take the motor and electronics out and sell the hull and hatch with hardware.

[wolffman]

jetchooper

Yes, i can take the motor and electronics out and sell the hull and hatch with hardware.

so do you have whatsapp ? better to change messages!
mine is 55 51 98126 0288

how much would it be whit hull and hardware ?
what bateries i need ? 2 4s 4000 mah ?