HFK Prototype

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Re: HFK Prototype

Post by tso on Thu May 16, 2013 12:13 am

wowowowowwwww!!!!!!! This is real fast!!!! well done manuel!!!

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Re: HFK Prototype

Post by metalsak 1973 on Thu May 16, 2013 6:41 am

manuel great job!!!!!! really this boat is still in your hands???? is a beauty!

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Re: HFK Prototype

Post by milemaster on Thu May 16, 2013 11:33 pm

i like your quality my friend!!!!! speed controls like as-26150bl is an excelent choise!!!
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Re: HFK Prototype

Post by MrRcFanatik on Tue May 21, 2013 1:13 pm

OH MY GOSH!!! Well done man!!! That looks AMAZING!!!!! Shocked Very Happy

Can't wait to see more!!
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Re: HFK Prototype

Post by ManuelW on Wed May 22, 2013 2:28 am

Thanks for the comments.

With some further testing I could push that setup to a speed of 138km/h.

Here another video:


And a few more running pictures:











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Re: HFK Prototype

Post by MrRcFanatik on Wed May 22, 2013 3:58 am

Awesome!!
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Re: HFK Prototype

Post by dimitriskouras on Wed May 22, 2013 12:33 pm

i like to see good prototype like yours going fast!!!!!!! the creation of a new boat is the ultimate achievement of a builder!!!! fantastic job manuel!!!

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Re: HFK Prototype

Post by zackthrills on Thu May 23, 2013 1:32 pm

I would like to have you build me one. Would you be up to it? Manuel

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Re: HFK Prototype

Post by ManuelW on Fri May 24, 2013 12:49 pm

Hello,

thanks for the good response. Well with 138km/h the setup was on top of its capabilties. So the next step was to use an upgraded setup which was:

2x LMT 1950/9 HiAmp WK
2x AS 26.150 BL
2x 8S Lipo 4400mAh 30C
Props: startet with X447

The setup was way more powerful than the previous one and when I first took that picture of the setup in front of the boat I got a little scared if that really makes sense. Weight was still not a huge issue, even on 2x 8S it had just around 6000g.

Here the picture of horror Shocked :


First tests were not good, had massive troubles with the couplers. But could sort that out and with standard X447 I could already reach stable 147km/h which was pretty good also with wind & waves. For two lengths I tried a set of ABC 1816/3 which I could borrow from a friend and the GPS noted 154km/h sadly with a flip so no "official" value. But still very very promising...
Sadly from those runs there are no videos. Only the motors were running quite at their maximum and got always pretty warm. Next step was to upgrade the hatch with bolts & screws as just using tape was not a real option and pretty risky as everytime I need several meters of tape and after a flip most of it was ripped off.

Here two running pics:




regards,
Manuel

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Re: HFK Prototype

Post by MrRcFanatik on Fri May 24, 2013 12:53 pm

It just keeps getting better and better!!!! cheers

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Re: HFK Prototype

Post by ManuelW on Sun May 26, 2013 6:20 am

Hello Guys,

as said next step was a suitable hatch lock system. Kept me busy some time as that cevlar canopy showed to be pretty resistant against many kinds of machining. Rolling Eyes
But in the end I won. So now in each corner there is an M4 countersunk screw with suitable threaded parts glued to the hatch frame of the hull. In addition there are two 7mm bolts on the front of the canopy with two counterpart bores in the hull. In that area I reinforced the canopy with a carbon fibre sheet as the pure cevlar was not stiff enough in my eyes.
Not thats is a "bulletproof" or in other words strong and reliable solution, since that mod I also didnt have any further problmes with taping or the hatch trying to come loose.

and some pictures:






regards,
Manuel

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Re: HFK Prototype

Post by milemaster on Sun May 26, 2013 4:26 pm

very nice idea and very praktical!!! cheers
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Re: HFK Prototype

Post by MrRcFanatik on Sun May 26, 2013 5:08 pm

Cool!! Like Milemaster said... very practical!! Nice work man! Smile

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Re: HFK Prototype

Post by ManuelW on Mon May 27, 2013 11:01 am

Hello Guys,

next step was to try again to hit and exceed 150km/h+ but for the next two tried is destroyed a new collet each time. Luckily the shaft remained so I didnt use the propshaft and especially the prop.

Thats why I started to design my own coupler system for that boat:



Those are fixed couplers from 5mm motor shaft to 6mm, on the shafts I glued 20mm long jackets from stainless steel/V2A with an outer diameter of 6mm. On those jackets are four flat spots for the grub scews with cutting ring. Here a big thanks to my friend Christian who made me these parts according to my drawings. cheers

So I did another try and that is now the first video with the new setup. It runs already pretty good just on X447:


I then switched another time from X447 Andy Brown to ABC 1816/3 from Flo, sadly there is again no video. I just have a photo of the GPS to proof it. Today its not that good any more, in 2009 hitting 160km/h was more impressive.



At that run the lipos even cooled down, only the 1950's are on the edge after six fast passes. It ran pretty good but a little pressed in the front --> aim was to improve motor cooling and max currents to decrease temperature and increase runtimes.

regards,
Manuel



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Re: HFK Prototype

Post by milemaster on Tue May 28, 2013 2:34 am

very practical and well designed collet!!! cheers
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Re: HFK Prototype

Post by ManuelW on Sun Jun 09, 2013 12:15 pm

As said I needed to improve cooling as the motors were close to their limit. Thats why I replaced the stock LMT water jacket against a Hopf spiral type one for 29,95€ the piece. The trick about those is, there is a spiral cnc machined inside so the water is forced to flow over the full surface before it can exit the jacket. This ensures maximum cooling, I modified them a little by inserting bigger inlets and outlets as well as some minor modifications inside to improve flow. Also they are 50mm and so longer than the stock jacket, now the full surface is cooled.

Here some pictures:




And thats how the motors looked fully assembled:
LMT 1950/9 with my coupler system, custom bolt circle flanges, the Hopf water jacket, LMT rear support jackets and my custom made POM rings for connector support at the end. Cant see much of the motor any more. But it worked pretty well and helped to decrease the motor temperatures between 5-10°C depending on conditions which can definitely make a difference if it works or not.





regards,
Manuel

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