Hornet F1 Tunnel hull mods and test runs

This is a video of the modifications made to my HobbyKing Hornet F1 Tunnel-hull rc boat. Included are the first test runs with the mods on 4s LiPo batteries.
HobbyKing Hornet F1 Tunnel-Hull:
www.hobbyking.c...
MOD PARTS USED:
Turnigy Marine 120A esc:
www.hobbyking.c...
Turnigy 3848-1450kv Brushless outrunner:
www.hobbyking.c...
Fullers Fast Electric ebay store:
stores.ebay.com...
K&B Adjustable 3.5 outboard mount:
shop.mecoa.com...

[@stratosFZ1]

HI Frank first of all thx for all the mods u upload to show how the hull can be better!U really helped me!I tried to put also a 4 cell lipo in my F1 but when i test run the boat at full throttle the propeller (with the shaft propeller went out of the outboard leg!!!:(:( So i d like to ask you the upgrade that you bought from ebay is ready to install??What i mean is the the outboard unit has already the flex shaft inside and a prop shaft or u put these parts from the stock outboard lower unit?THX

[@steg140]

thanks! I'll try describing you a few more things, maybe you can help. in both the cases the boat ran with a 3 cell 5000mAh li-po battery and the cooling was perfectly working (I did the adjustments you did in your first videos so I could see the water coming out), in the first run with the stock esc, in the second one with a 30A new one. when the boat runs the propeller is near the surface, the second motor was a 4800kv. cheers

[@DiehardRCaddicts]

The motor mount allows adjustment of the motor angle and height to fine tune the ride additude of the boat. My boat hooks like yours if I turn too sharp too fast. You can stop this by putting an inward angled turn fin under the hull against the right side sponson at about the cg. Or you could just adjust dual rates in the steering on your radio so you don't turn so sharp.

[@DiehardRCaddicts]

@stratosFZ1 the Fullers lower leg unit comes with the flex shaft and prop shaft and swivel mount already installed If you have any questions be sure to ask Ray Fuller on ebay before ordering, he is always a great help.

[@DiehardRCaddicts]

@VitorHugoz as seen in the video the water did not ruin the motor. You just have to be sure to check the bearings and keep them lubricated.

[@DiehardRCaddicts]

Not sure which shaft you are talking about. If you mean the 5mm motor shaft it is the stock one only cut shorter to fit in the lower leg. If you mean the flex shaft or prop shaft at the bottom of the drive, I was using the stock ones that come with the Fullers Fast Electric lower drive leg. You can find them on Ray Fullers ebay site. You can find a link in the video information bar below the video.

[@DiehardRCaddicts]

@Boot2yourHead from what I've read on the rc boat forums electric outboard motors get wet quite often when the boat goes bottom up. A lot of guys say if you still have juice left just spin the motor up to ring the water out then through the boat back in the water and go! Oh and always remember to relube the bearings after you finish running. It's been working so far!!

[@DiehardRCaddicts]

We haven't tested the Sprint F3 so can only give suggestions on that one. I think it is smaller than the Hornet F2 so you may be more limited as to what you can run. If you are going for 6s keep the motor kv rating around 1600kv.

[@nataliasaavedra9736]

nice video and boat. what did the adjustable motor mount do for you? did it make the boat turn better? My boat tends to hook and spin out. maybe im turning it too hard in a tight circle.

[@DiehardRCaddicts]

@traxxasinsane1 yes it will work fine with an inrunner motor. Actually if you buy the ready to run outboard from Fullers Fast Electric it comes with an inrunner motor on it.

[@Linoge279]

thats a good speed for racing and whats the runtime with that motor?I didn't expected the tunnel ran that fast, you should mod more of this tunnel and sell it, should sell like hot cake!!

[@Th3PyR0D3viL79]

Very Nice Boat! Best Regards from Germany !

[@catamaranman333]

Also, have you thought about using a check-valve in the drain holes so if you do get any water in the hull it comes right out (as long as you're on a plane)

[@steg140]

thank you very much, you have been very kind

[@steg140]

thank yo so much for your answers! so if I could find a 28mm motor with a maximum of 1400kv I may have my problem solved? I guess the stock one was defective then or it should have not burned..am I right? I saw your first run when the boat was stock and it seemed everything was allright...

[@DiehardRCaddicts]

This boat comes stock with an outboard setup. There was no motor or drive hardware mounted inside the hull when I got it. I just upgraded to a better outboard unit.

[@DiehardRCaddicts]

Yes, and you just answered all your own questions.

[@nataliasaavedra9736]

ok thanks. How did you angle your boat with this new mount? Did you raise the motor up or down?

[@mactone007]

Batteries and motor are good in the water no problems

[@heidiacepair]

Frank - have you tested the new Sprint F3 ?The stock motor is a 3000kv on a 3s -.Any suggestion for an upgrade to a 6s

[@DiehardRCaddicts]

I got the outboard drive from Fullers Fast Electric. Please check the links in the video information bar below the video. The Fullers lower leg unit comes with the flex shaft and prop shaft and swivel mount already installed If you have any questions be sure to ask Ray Fuller on ebay before ordering, he is always a great help.

[@TheLipRipp3r]

Awesome!

[@DiehardRCaddicts]

Could be a lot of differnt things.Examples: New motor kv is too high for stock prop size, not getting good water flow for cooling, prop shaft not lubed well and is binding, running too many battery cells for the setup, the prop is too deep and causing too much load, the drive angle is wrong and causing the boat to plow which makes the motor have to work too hard. Check all these things

[@frankkjllefjord446]

Hi Frank what did you do with the motor and parts inside? I own a Dragon Tamoil F1 that look very similar to your boat, inside my boat it's impossible to do anything as i think the parts was put inside before the hull was placed around it. Also the sleeve that is suppose to connect the motor and propeller shaft drive me nutz... the locking screws will simply not lock the axels in place (i end up breaking the allan holes in them. Thus i'm looking to outboard it now

[@DiehardRCaddicts]

Angled down 1 or 2 degrees with the prop center line even with the bottom ride surface of the boat.

[@simoncfly]

Hi Frank, I've copied your mods, except I got the large aluminium leg. It went ok on 3s and is very quick on 6s. However the 5mm shaft has broken on at the coupling on only the second speed run. I was using a 40mm aluminium propellor. The sales guy reckons 6s is way to much. What shaft are you using?

[@frankkjllefjord446]

Ok thanks for replying :) I've been able to sort out my locking screws problem... finally. What do you suggest to do to extend the drive time on my boat, is it is now i run a 1.11V 3S 2200mAh which give me 8 - 10 min. run time. The ESC is water-cooled 50A so i guess i can upgrade some, just wondering if it will be worth it.

[@DiehardRCaddicts]

Well I see your problem clearly now. 4800kv is about 3.5 times more than the stock motor which is 1400kv. The stock prop is way to big and that is what killed the second motor. Your lucky if you didn't burn the esc too! If you are going to run a 28mm diameter motor with the stock prop you will need to stay around 1400kv. If you want to run a high kv motor, you can go up to 2800kv but would need to go down to a 35mm prop.

[@S30Uploads]

i recognize that pond, do you know 4mods?

[@redpony666]

I am an avid follower of yours from Montreal Canada and the thought is how goes the Fullers lower leg ?

[@DiehardRCaddicts]

Mike Sallustio The Fullers lower leg has been petty bullet proof so far. even on 6s setup. You just have to remember to keep it well lubed after every few runs.

[@redpony666]

Got it thanks

[@steg140]

excuse me, I burned two motors with this boat, the stock one and a new one which had the same dimensions as the stock one. before the second run I even changed the esc to be sure it could properly match with the engine, but it fried after 1 minute...can you tell me what's wrong?

[@heidiacepair]

Thanks - But it is going to be a bit difficult to find a 1600kv with a shaft size of 3.175mm - Don't think HK carry any of those

[@DiehardRCaddicts]

Sorry, don't know what you mean by 4mods

[@jdgurl143]

where do i get a replacement flex shaft, and drive dog, and collet?

[@MrChris3462]

i want to to the upgrades but keep the look of an actual boat outrunner any ideas ???

[@mickbet380]

hello where did you get the parts to make the outbaord

[@RIPcombat]

6s up front hang on. I no you have to try it

[@dioncuda]

man, that thing has alot of bite:)

[@steg140]

haha nice vid, funny

[@catamaranman333]

I knew it was only a matter of time before the 6s batteries found their way into a boat.....

[@DiehardRCaddicts]

@jdgurl143 links to all the parts used are in the video information bar below the video.

[@julie14ist]

Hello I shall like the reference of the helix thank you I have to find the boat on hobbyking the esc and the engine but I find not the helix Sorry I am french thx

[@S30Uploads]

its a channel, maybe its just that sprinkler in the lake, they must be kinda common. anyways, check out his channel I bet you'd make good friends =D

[@catamaranman333]

Oh, one last thing.....that pond is shrinking.

[@redrumm101]

Im thinking 4mods is a screen name for someone.

[@beaneriser466]

the boat is flying about 73.5 percent of the time lol.

[@pattayais]

Using a motor kv

[@jameswest4314]

I think ya need a bigger pond. lol

[@TheBrushlessracer]

Don't spend more with hobbyking than your willing to lose.

[@UtRadioGuy]

I want an Asian girlfriend that will come out flying with me!

[@Boot2yourHead]

Franky she move, now how the heck is that motor still good I thought they were done if they got wet. guess i have to rethink brush less motors.