The Voracity tuning thread

[arrover]

Its really hard to tell from pictures. It sort of looks like the strut might be to low but again, hard to tell from pictures. That is the same as being "trimmed down" so it would put more of the nose of the boat in the water and cause more drag. Trim it up by raising the strut slightly. Try to measure precisely where it is now before you loosen the bolts. The trim tabs look ok but it's hard to tell without a straight edge on the bottom of the hull to compare them to. Does your prop look ok? No big burrs or casting marks on it? Does the prop look bent at all? Just to make sure, have you been greasing the flex shaft?

[badlaa]

Thank you Rafael and Arrover. I will try the tips you gave me! 😊

[Crash]

One thing that also comes in to play is what we call "heavy water", especially for a V or mono that is cutting through the water; not so much for a cat or a hydro. What this means is that some water is heavier in mineral and plant content which causes the boat to be slower as it requires more power to cut through the water. In our case here in California, the drought has cause the water to thicken up. I can run in the lake near our office and be 2-3 mph slower than at another body of water where the Water District filters the water.

Another thing is that most GPS units take about 7 seconds to get max MPH. I have verified this with my Garmin eTrex, Garmin Fore Runner and our Dynamite GPS, while in my car. They all take an average of 7 seconds to register a steady speed; max speed. When taking reading with a GPS unit make sure you have enough space and get as long of a run as you can to allow the GPS to top out and register the max speed.

I'll post the video again of me doing 52 with a production boat. This is completely raw, unedited video of one of my speed runs where I get 52 mph. This is the lake where they filter the water. Notice how clear the water is.https://www.youtube.com/watch?v=6vIBa1imVZE

Great point Rafael

I can tell now by the amount of boat that's out of the water when its going fast.
It has to get a lot of hull out of the water to go over 50mph.
then your on the edge of disaster over the recommended speed for this hull....lol
The stock speed is perfect imo for this boat.
great product, incredible customer support.
Dan

[killerbob]

Hi All ..

Just recently found this forum - and for fast electrics it seems to be the place to be..

To be honest I have not read this entire thread - just about half of it. Someone asked for logging data - and I do not know if someone else have posted... But I run telemetry and I have a lot of data..

First I should probably mention that I run the X452 prop - otherwise stock setup... At least until the water around here goes liquid again - then I will be continuing with the Turnigy 180A Marine ESC as the stock Dynamite ESC have developed a nasty habit with fluctuating BEC voltage - it is starting at 6.0 and then goes to 8... that causes "something" in my receiver causing temperature alarms. I have also ordered a Leopard 4092... BUT this is for the coming season... The data I have is for STOCK Voracity running 6s with the x452 balanced and sharpened

RPM at full speed: 31.600
Max Amps recorded 147.2 (apart from the BEC problem it is holding up fine)
Voltage under max load 21.0 V
Max wattage: 3,090 W ( 4,2 HP )
Max speed recorded 55.2 (BUT this might very well be wrong - my pond is very small and I have approx 3 secs at full speed - and that is not enough for a proper GPS measurement)

Hope this is helpful

Video here: https://www.youtube.com/watch?v=PIi2ptTH7Yw
Note: Typo in the video about the prop - it IS the x452

[arrover]

I guess I should have looked at your username before posting...... Thanks for the data. Very interesting! I think your boat is most likely faster than the 55mph. It should run around 60 with that prop. 3 seconds probably isn't enough, like you say.

[killerbob]

Arrower - no need to delete the numbers. They are relevant for a completely stock ship. The numbers I posted here are with the octura prop. Of cause they are higher.

But yes - same guy... Just like most of us visit different ponds - we also visit different forums :)

[angrycat]

killerbob what are you using to log? whatts up meter?

[arrover]

Sorry about that. I just didn't want to step on your toes since you've done the work of logging the data. Thanks again for that. I visit other boat forums but this is the only one that I look at regularly. Sometimes I just can't get enough RC boat info!

[killerbob]

I have replaced the stock radio with graupner. I have a mz24 and the transmitter logs whatever is connected to the telemetry. I use the UnisensE from sm modellbau for measuring motordata like voltage, current and rpm. I also have the graupner gps module that really is intended as vario module for airplanes - so it also measures flying height :) and of cause sh**loads of gps data

[angrycat]

i was wondering more or less what you had measuring wattage and amperage, would you recommend the unisense over a wattsup? my next esc will either be a hydra (if i can freaking find one) or a etti and will obviously have logging but for now i need something just to get an idea of whats going on under the hood

[killerbob]

I do not know wattsup. But the unisensE Products are good and they support most telemetry systems. They do NOT log anything in the boat but transmits data 10 times a second to the TX. My TX can then log the data only limited by the size of the sd card plugged into the TX. The UnisensE is small and comes in both 140A and 280A versions...

[revoltrunner]

I bought a bare hull from a member
here and started the mods on it. waiting
for parts. more to come.

[Crash]

I like it, who makes it and whats the part number. I wouldn't mind something like that on mine.
Does that come with the speed master bushing ?
dan

[revoltrunner]

I've had that for long time but it looks like this one
http://www.offshoreelectrics.com/pro...os-stinger-str

[Voracity]

Hi guys

Wat remplacement props do you recommend to safely use with everthing else stock and which major upgrades (esc, motor, prop) if i would like to make a big change (65 mph range). Leopard and turnigy 180? Are there things to consider here or just swap engine and esc? Do you have reinforcements in the hull? I am planning to use carbon/kevlar on inside