Project FighterSplat- 24.5" Stepped Mono

[martin]

I done the same on a small mono deep v that i intended replacing the stock motor & esc useing 2445 3000kv on 3s running x435 which is really to big a prop for this set up. It was fine on 30mm &32mm props but wanted to push for more speed & guess what. replaced the origanal water cooled motor & esc with a 3600kv outrunner motor & higher amp esc & getting around 45mph on a 15" mono hull. I also went from 25c-35c lipo to 45c-90c Nano Tech both 3s and the difference in speed in the same boat on the same day was very noticable. These small 300-400w outrunner motors have got unbelievable torque over the small inrunners. Even running higher kv it will take the same props & out accelarate by a long way the original inrunner motor as well as much higher top end all from a whopping $18 motor, Original motor was around $60. Martin.

[FighterCat57]

I done the same on a small mono deep v that i intended replacing the stock motor & esc useing 2445 3000kv on 3s running x435 which is really to big a prop for this set up. It was fine on 30mm &32mm props but wanted to push for more speed & guess what. replaced the origanal water cooled motor & esc with a 3600kv outrunner motor & higher amp esc & getting around 45mph on a 15" mono hull. I also went from 25c-35c lipo to 45c-90c Nano Tech both 3s and the difference in speed in the same boat on the same day was very noticable. These small 300-400w outrunner motors have got unbelievable torque over the small inrunners. Even running higher kv it will take the same props & out accelarate by a long way the original inrunner motor as well as much higher top end all from a whopping $18 motor, Original motor was around $60. Martin.

I've been finding the exact same. It seems that outrunner motors designed to swing an air propeller do well at swinging a boat propeller.

I'm also finding that higher voltage, lower amperage, lower KV setups perform better, longer with less heat.

All of the little red Turnigy outrunners from HK are made by Suppo Model. I buy them factory direct (not cheaper) to get the KV's that I want.



As for the cheap assembly from the chinese ARR boats, yeah, they need to immediately be disassembled and re-assembled correctly. The wood is unsealed and quickly molds/rots and the glue used is prone to failure. I've found that coating the interior with polyurethane or epoxy paint helps prevent ply separation and staining from greasy pond scum. This is the biggest reason I started FighterCat boats. The parts are of good quality, but the assembly and paint is lacking. So I provide them unassembled and unpainted. =)

[questtek]

I done the same on a small mono deep v that i intended replacing the stock motor & esc useing 2445 3000kv on 3s running x435 which is really to big a prop for this set up. It was fine on 30mm &32mm props but wanted to push for more speed & guess what. replaced the origanal water cooled motor & esc with a 3600kv outrunner motor & higher amp esc & getting around 45mph on a 15" mono hull. I also went from 25c-35c lipo to 45c-90c Nano Tech both 3s and the difference in speed in the same boat on the same day was very noticable. These small 300-400w outrunner motors have got unbelievable torque over the small inrunners. Even running higher kv it will take the same props & out accelarate by a long way the original inrunner motor as well as much higher top end all from a whopping $18 motor, Original motor was around $60. Martin.

Great minds must run alike............ Those are the exact same Nano Tech batteries I ordered. I found with the Eagle Tree I was pulling 70 plus amps and the LiPo voltage would drop too much. Glad you like these.

I tooks Bens recommendation and bought some small Turnigy 400 Watt outrunners. Nice motors but a bit small for a 23" mono so I went to the next size up....1500 Watts! They have been shipped with the batteries.

[martin]

A lot of these small outrunner motors that are in the 3000kv - 4000kv are helicopter motors which have very high torque along with high rpm. With small mono hulls you have to be carefull you dont go to low on kv & put higher voltage through because these mono hulls are very narrow by design & you simply end up spinning the boat around the prop with to much torque & to big a propeller. Martin.

[FighterCat57]

Great minds must run alike............ Those are the exact same Nano Tech batteries I ordered. I found with the Eagle Tree I was pulling 70 plus amps and the LiPo voltage would drop too much. Glad you like these.

I tooks Bens recommendation and bought some small Turnigy 400 Watt outrunners. Nice motors but a bit small for a 23" mono so I went to the next size up....1500 Watts! They have been shipped with the batteries.

I recall recommending the 1500's but only complimenting the smaller 600w outrunners. I have a pair in a villain that do well. No matter, semantics. =)

A lot of these small outrunner motors that are in the 3000kv - 4000kv are helicopter motors which have very high torque along with high rpm. With small mono hulls you have to be carefull you dont go to low on kv & put higher voltage through because these mono hulls are very narrow by design & you simply end up spinning the boat around the prop with to much torque & to big a propeller. Martin.

Yeah, definitely not low RPM, higher RPM and smaller prop. Seems to be a fun "power band" in higher RPM setups. High volt, High RPM, low amp, low KV. 36-40k.

[Brushless55]

yeah, I think these smallers hulls do better with higher kv motors
kinda like using a 10500kv motor in a 24th scale SCT Truck vs a 2200kv motor in a 8th scale truck

[martin]

These small monos are deff great fun to run especally when its a bit colder & you dont have to go & get your boat in the cold water. Their very cheap to buy or build & if any thing blows trying to get more speed as you do their very cheap on motors & esc replacments. Their so cheap you can buy a number of different motors as their are a lot around to try increasing speeds. Your not even really restricted in running such small boats in a bit of rough its more fun actually because the boat just keeps running no matter what, It either goes through a wave or over it because it dosnt matter how it ends up its allways the right way up & just gets on with the buisiness. Their also not to shabby on speed with the right motors & set ups for small money. Ive got a 15" mono that does around 45mph & still playing around with diff motors & when you see how fast & manoverable these little boats are in turns it seams their that much faster again. I now only run small self righting boats because i find them more fun & not to serious & i can do 45mph on a very small patch of water if nessesary. Martin.

[Chuck E Cheese]

what 15" self righting mono are you getting 45mph out of? i have always found that the smaller >17" dont like much over 35mph

[martin]

Wait for it, Its a Joysway Warrior modified with a raised air bubble on top of the hatch offset to one side to give the nessesary biased when upside down along with the offset weight of a heavier Nano Tech lipo. Hull has a double seal, The normal type clear sheet that sits on before the hatch but not the one they supply. I modify how this fits & make a new clear cover that sits inside the opening so the clear cover & deck line are flush to each other giving a better water seal & wider area for tape to sit on around the deck part. I also tape the hatch as well so with the amount of trapped air inside along with the raised bubble its like a cork when it goes over, I dont even have to close the throttle because it rights instantly.Done a lot of work getting the hull trimmed correctly +shortened rudder & rounded bottom,made new rudder hinge pin to take slop out of rudder,stiffened rudder mount bracket (all this movement in this area really affects a 15" hull at speed) With 35mm prop & stock motor 3000kv & 30amp esc i got 37mph. Fitted an Etti 3600kv outrunner motor & Etti 45amp esc & around 45mph on 35mm prop. I think this motor will poss take a bigger prop still but getting close to limit of hull regarding torque roll. The diff in exceration & top end is unbeliavable over the stock boat which i thought was pretty good any way at 37mph. Martin.

[questtek]

Ben,

How is your Nighthawk build coming. I have now installed and will test (as soon as the rain stops) a 1600 Watt Turnigy outrunner 1600KV on a 4S, 3300mAhr Turnigy Nano 45-90C battery. Pics show the install and my Garmin GPS to keep me honest. The 600 Watt outrunner was nice but it was clear that it could handle more....much more.

[FighterCat57]

Ben,

How is your Nighthawk build coming. I have now installed and will test (as soon as the rain stops) a 1600 Watt Turnigy outrunner 1600KV on a 4S, 3300mAhr Turnigy Nano 45-90C battery. Pics show the install and my Garmin GPS to keep me honest. The 600 Watt outrunner was nice but it was clear that it could handle more....much more.

I ran it this weekend, but not with a GPS. The mini rudder I installed is way too small and I haven't had the chance to change it yet. It's a rocket though!

I'm running the same 3126 I recommended and looks like you have installed.
I have a 2200kv version too. The Turnigy 1600/1300 are made by Suppo Model and I carry their motors.

Can't wait to get some time to get it wet!

[questtek]

I ran it this weekend, but not with a GPS. The mini rudder I installed is way too small and I haven't had the chance to change it yet. It's a rocket though!

I'm running the same 3126 I recommended and looks like you have installed.
I have a 2200kv version too. The Turnigy 1600/1300 are made by Suppo Model and I carry their motors.

Can't wait to get some time to get it wet!

Please keep me posted on the outcome of your run. I am very interested in way performance you will get. What prop are you using on your 1600KV motor in the Nighthawk? I will also instrument my boat with an EagleTree since I want to know the amps and RPM. I am using a Seaking 90 AMP ESC and will try not to blow it up.

I actually ordered two these motors, ( Turnigy N3126 1600 KV), from HK so it's twin goes into the DeltaForce Sniper. I want to compare performance between the two boats with the identical power plant set up.

If they survive, I also ordered a few of the New Sale Outrunners, 1800 KV and a bit larger in size ( The motor diameter is 42.5 mm). This may really be pushing the limit for these small boats. I know I will have to lay in a layer of carbon fiber if I go to this "Big Bertha" motor!

To make the motor exchange easy in both the NightHawk and the Sniper I designed a quick-change motor mount set up. I hate palying with thos small allen screws in tight places...way too frustrating even with some hand-made tools.

Pictures show:
Original Sniper outrunner (left) and the two Turnigy upgrade brushless motors
My motor mounting system with aluminum base plate mounted in boat
Comparison of Original Nighthawk inrunner with large Turnigy outrunner H3126

[FighterCat57]

Please keep me posted on the outcome of your run. I am very interested in way performance you will get. What prop are you using on your 1600KV motor in the Nighthawk? I will also instrument my boat with an EagleTree since I want to know the amps and RPM. I am using a Seaking 90 AMP ESC and will try not to blow it up.

I actually ordered two these motors, ( Turnigy N3126 1600 KV), from HK so it's twin goes into the DeltaForce Sniper. I want to compare performance between the two boats with the identical power plant set up.

If they survive, I also ordered a few of the New Sale Outrunners, 1800 KV and a bit larger in size ( The motor diameter is 42.5 mm). This may really be pushing the limit for these small boats. I know I will have to lay in a layer of carbon fiber if I go to this "Big Bertha" motor!

To make the motor exchange easy in both the NightHawk and the Sniper I designed a quick-change motor mount set up. I hate palying with thos small allen screws in tight places...way too frustrating even with some hand-made tools.

Pictures show:
Original Sniper outrunner (left) and the two Turnigy upgrade brushless motors
My motor mounting system with aluminum base plate mounted in boat
Comparison of Original Nighthawk inrunner with large Turnigy outrunner H3126

Those motor mounts are nice! We should design a "Quick Release" motor mount with rails the comes out of the boat with just a few easy to get to screws.

I'm using a K40 prop. Which from what I've been told is about the biggest for that size hull. Next is more Kv.

Curious to see what your eagle tree says. I'm not getting over 100 degrees with the 125a Suppo on 4s/1600 K40 after 20c/2200mah runs flat.

[questtek]

Is that prop like a 440?

My batteries are 3300mAhr, 45-90C Nano-Tech and that's why I want to use the Eagle Tree. If you ever need more temp sensors for your Eagle Tree just let me know......
Glad you like the mounts. Secure and Easy. The base plate on the convential water cooled mount is carbon fiber of pheonolic material. VERY easy motor exchange.

[questtek]

Here is a comparison of the Large Trunigy outrunners set up in the Nighthawk stepped mono and the DF Sniper. The drive gear is identical, Same motor exactly, same battery, same 90 Amp Seaking ESC. It will make an interesting comparison. If the weater clears I should be able to make some runs today.