Project FighterSplat- 24.5" Stepped Mono

[FighterCat57]

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.

The K40 is a carbon filled plastic prop, similar to a x440, but not as stiff.

Looking forward to your results!

[Brushless55]

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.

both nice looking setups

[questtek]

Ran them with 438 props. I am using the 1600 KV Turnigy outrunner and it REALLY needs a 5S set up. 4S just does not give hte boat enough RPM's. The motor temp never over 90F so I realized I was not pushing anything on the 4S set up. I will test the boats on 5S tomorrow and maybe even go to 6s but then I begin to worry about the Seaking ESC at that voltage. I can prop up but believe the boats will have way to strong of a right side pull at high speed.

[FighterCat57]

Ran them with 438 props. I am using the 1600 KV Turnigy outrunner and it REALLY needs a 5S set up. 4S just does not give hte boat enough RPM's. The motor temp never over 90F so I realized I was not pushing anything on the 4S set up. I will test the boats on 5S tomorrow and maybe even go to 6s but then I begin to worry about the Seaking ESC at that voltage. I can prop up but believe the boats will have way to strong of a right side pull at high speed.

With the 1600, go 6s! Two small 3s in series.

A capacitor will help with heat on the ESC, will help with voltage drops too. I have the new one setup on the bench and ready for 4s/2200 or 6s/1600kv.

With 6s you'll want a resistor for no-spark.

[martin]

With these design mono hulls which are quite narrow you have to be care full with torque roll, Going for lower kv x 5-6s is not always the best way. You really want high rpm but at lower voltage ie much higher kv motor on max 4s in that hull. You want some thing like 2400-2500kv on 4s & the hull will have good speed with better stability. Martin.

[FighterCat57]

With these design mono hulls which are quite narrow you have to be care full with torque roll, Going for lower kv x 5-6s is not always the best way. You really want high rpm but at lower voltage ie much higher kv motor on max 4s in that hull. You want some thing like 2400-2500kv on 4s & the hull will have good speed with better stability. Martin.

Done. We'll see how she runs!

I replaced the brass tube with K&S 1/4" which is a perfect sub in for the 6mm brass that comes in the metric boats. There is a weight savings, but it's negligible.

Notice in the last photo, the teflon liner is adjusted so it fits right into the overhang of the coupler. This prevents shaft splatter. Quite well I might add.

I used a medium size aluminum mount and drilled/tapped the sides to accept the lightweight high torque DMG servo.

Used a Hobbwing 60a ESC and the following math:
4s1p, 2200mah, 20c = 44 amps
Starting with a 538 prop which should end up just about perfect for this little hull.

The whole boat weighs in at just 2 1/2 pounds with batteries, RTR.

After the mistake choosing the mini-rudder on the last one, I jumped up to a 95mm straight rudder.

Now that I have "twins" to compare, we can stack up the 4s/2200 vs the 6s/1600.

[Chuck E Cheese]

ok i am going to give a few opinions here (and they are just that. opinions). i have been playing with small monos for a couple years. my current boat to compair to this is a h&m no step 1, it is 23". i run a neu 1509 2s set-up (4500kv) and it works well. here are a few things i have learned over the years:
1) a boat this size likes weight, mine weighs 3 3/4 lbs (3lbs 12oz). they are running 40+ mph and need the weight to remain stable.
2) i like to use full size motors, 540s. 23" is a large hull to push with a 380 (or compairable outrunner). the smaller motors can push them but it stresses everything trying to spin the right size prop
3) spin a small prop faster rather than proping up (mine likes a modded x438 and also ran great on a 4950kv with a 435). larger props upset the hull and cause handling issues. i disagree with the previous post that yyou are better off using a lower voltage/higher kv motor. it doesnt matter, the boat doesnt know the difference. total RPM is total RPM weather coming from 12s or 2s.
4) use bigger batteries. it is hard to get what you need from batteries that will only put out 44 amps. granted i run 2s, i am running a turnigy 180 esc and 8000mah 40+c batteries (2s2p 4000)

i would be willing to bet that this hull would rip with a ammo 36-50-2300 on 4s and a 438

[martin]

My experience with micro type hulls around 15" for hull length is that if useing a lower kv motor on higher volts you have a motor that normally has more torque their for you tend to put a bigger prop on , Simply because you can with this set up & its all about going faster so we all put the biggest prop we can get away with. All you end up with is a very small hull that simply cant take the torque of the prop & you end up with the boat spinning around the prop. I know from my own 15" boats at around 45mph they are very sensative to torque with not much of the hull touching the water , At around 41-42 mph the hulls are rock steady with slightly more hull in the water. The extra 3-4mph past this point really does make a signifacant difference to how the hull behaves. Thanks Martin.

[martin]

I think 2200kv is a bit low on 4s, personally i would go around 2350 -2400kv. Good luck & have fun thats what its all about. Thanks Martin.

[FighterCat57]

ok i am going to give a few opinions here (and they are just that. opinions). i have been playing with small monos for a couple years. my current boat to compair to this is a h&m no step 1, it is 23". i run a neu 1509 2s set-up (4500kv) and it works well. here are a few things i have learned over the years:
1) a boat this size likes weight, mine weighs 3 3/4 lbs (3lbs 12oz). they are running 40+ mph and need the weight to remain stable.
2) i like to use full size motors, 540s. 23" is a large hull to push with a 380 (or compairable outrunner). the smaller motors can push them but it stresses everything trying to spin the right size prop
3) spin a small prop faster rather than proping up (mine likes a modded x438 and also ran great on a 4950kv with a 435). larger props upset the hull and cause handling issues. i disagree with the previous post that yyou are better off using a lower voltage/higher kv motor. it doesnt matter, the boat doesnt know the difference. total RPM is total RPM weather coming from 12s or 2s.
4) use bigger batteries. it is hard to get what you need from batteries that will only put out 44 amps. granted i run 2s, i am running a turnigy 180 esc and 8000mah 40+c batteries (2s2p 4000)

i would be willing to bet that this hull would rip with a ammo 36-50-2300 on 4s and a 438

Agreed about the 540+ motors. The 3126 is a 540 and rated at 1500 watts.
I'm curious about the weight. The principle I'm applying is lighter load = less amps.

Also higher V = less A, for example 600 watts on 2s = 81 amps, on 4s = 40 amps and on 6s = 27 amps. The advantage comes in requiring less amps. (600 watts is .8 HP)

As for today's water... it's coming from the sky.

Ah, to test another day!

[FighterCat57]

Some video of the FighterSplat in action. No GPS data, but it was faster than a SuperVee!

[FighterCat57]

BTW- The COG is WAY too far foreward on these, hence the poor turning. Making due with the battery packs on hand.

[Brushless55]

wow!