Search found 24 matches

by staska
Aug 28 2019 6:25am
Forum: Electric Aircraft
Topic: Sevcon Gen 4 Errors and Solutions thread
Replies: 52
Views: 12485

Re: Sevcon Gen 4 Errors and Solutions thread

Done this already, only to extranl site with expired password. Tried to register here for myself..
by staska
Aug 28 2019 3:08am
Forum: Electric Aircraft
Topic: Sevcon Gen 4 Errors and Solutions thread
Replies: 52
Views: 12485

Re: Sevcon Gen 4 Errors and Solutions thread

Hi ! could someone send me a link to for dvt software ?
by staska
Sep 07 2017 5:59am
Forum: Battery Technology
Topic: greenworks old type 40v battery.
Replies: 6
Views: 990

Re: greenworks old type 40v battery.

Ok. So it is ok to use 4 packs to deliver 2000watts in longer burst ?
by staska
Sep 05 2017 4:16pm
Forum: Battery Technology
Topic: greenworks old type 40v battery.
Replies: 6
Views: 990

Re: greenworks old type 40v battery.

Thanks guy for reply. No, i am from europe. I had solve this problem in simply manner - use regulated switched mode converter from ebay. 1.2-36 volts and 8ampers. 12 amps protection. Vorks perfectly. I' am littly dissapointed on china cells. Are they any good on long run ? 7 amps are per cell or per...
by staska
Aug 27 2017 1:46pm
Forum: Battery Technology
Topic: greenworks old type 40v battery.
Replies: 6
Views: 990

greenworks old type 40v battery.

Cheaply for 25 gbp each bought four greenworks old type, non gmax batteries. Looks like new. Holds charge well. Will use it for e surf board. Did any one have any ratin on max djscharge current ? Yes, i do found how to activate them. Also - did any one now how to use this old type battery on gmax to...
by staska
Aug 25 2017 3:06am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

A 1600mm long HTD3 15mm wide belt is only 30€ and really strong. If i can find a good tensionning system i'm sure it can work. There is not such a thing as really, strong. All should be calculated. I think this : https://i.imgur.com/nuUIxn0.png Or that one: https://i.imgur.com/oGleLAS.png But, yes,...
by staska
Aug 16 2017 6:04am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

If any one is thinking of angled gearbox, got some info from supplier - 10 gbp for set of bevel gears, 12/22 teeth and M1.5 module + you will need main 62020 bearing and 6001 on small end for main shaft, and two 627 on vertical shaft. + aluminium foundry and some machining. It will be happy with 2kW...
by staska
Aug 15 2017 3:46am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Isn't this for 20,000 hrs running life? I probably have my rose-tinted reading specs on again! Wider units, capable of sustaining higher torques, will create substantially more drag won't they? Anyway, 60 euro to find out! It is always possible to add aditional bearing for axial load. You will be m...
by staska
Aug 14 2017 5:05pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Isn't this for 20,000 hrs running life? I probably have my rose-tinted reading specs on again! Wider units, capable of sustaining higher torques, will create substantially more drag won't they? Anyway, 60 euro to find out! It is always possible to add aditional bearing for axial load. You will be m...
by staska
Aug 14 2017 4:26pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Sorry to be on sarcastic size. But 40 sised gearbox is good till 16-20 kg of thrust https://www.neugart.com/de-de/produkte/ ... ple/#PLE40

Any decent 2hp/1.5kw outboard gives you about 50 kg of thrust.. More on zero speed. Or 55lbs per hp.
by staska
Aug 14 2017 6:52am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

http://flyingfishhydrofoil.com/ good idea on propeller drive
by staska
Aug 12 2017 5:48am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

I am a kite foiler and planning on joining in fun as a winter project. During my research I came across this http://people.cst.cmich.edu/yelam1k/asee/proceedings/2011/DATA/36-187-1-DR.pdf Don't know if people have already seen this on their research. Very good in my view. Says to me that these proj...
by staska
Aug 11 2017 11:12am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Howdy folks, I'm "notafraidtotry's" partner in crime (also on this forum) for an Electric Hydrofoil Board project. We appear to have been through the same research pains as many others. The biggest hurdle we are coming up against is the cost of a decent gearbox to reduce RPM down to the right level...
by staska
Jul 30 2017 1:26am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

And consequently, lowering kv increases torque proportionally, but decreases the top rpm, all within the constant of the motor wattage. So again, instead of using a gear box, why not just decrease kv? No. On same motor you may have same torque/ power on same rpm. With different voltage and amps rat...
by staska
Jul 29 2017 3:49pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Found another good source of brushless motor. This is a motor from electric power steering pump. Core is 7 * 7 cm or a little more. This drives hydraulic pump directly. Few kilowats easily i could guess. Will try to figure out oroginal amperage of it. It from gm family. Thanks for plywwod foils. Las...
by staska
Jul 29 2017 9:35am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

parabellum wrote:s. End result always was, stay out of all that kids stuff.
This is human psychology - we want it better and for free :)
by staska
Jul 27 2017 4:27pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

I was loking into this https://crazyfoil.com/product/crazy-foil-2017-ex-002/ plain, rectangular foil with speed data important for us. Also - have seen an plywood kit somethere..
by staska
Jul 27 2017 8:07am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Did any one have good drawing for slow/stable/easy foil ? I do have access to big cnc router, could cut them from plywood and laminate. Found some calculations for hydrofoil boats, but not for boards..
by staska
Jul 27 2017 2:05am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

What exactly do you class as an industrial planetary gearbox and industrial brushless? "Robust by design", calculated to work 24/7 for few years with some / regularly maintenance. For gearbox - it is calculated not to transfer static load, but for dynamic/inertial load - like going on full rpm, and...
by staska
Jul 26 2017 2:35pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

But still - this think wont broke on first rock/straw/plastic bag which will be sucked into your propeller. I could argue of using inrunner with gearbox for clear water - but for smaller lakes/canals etc - it wont do it job. It will brake on any bigger impact. I think you may be forgetting that for...
by staska
Jul 26 2017 11:57am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Any drawing is better than 1000 words. In the attachment are two motors - one c6364 230kv which is maxed at 2850 watts, and pancake generator from inverter generator ig2000 which is rated at 2000 watts continuous. Cooling - just mount stator to aluminum plate. Burst i think is at least 4000 watts. w...
by staska
Jul 26 2017 10:39am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

******* ATTENTION ******* This is a warning to all, DO NOT BUY GEARBOX THAT IS MADE IN CHINA! They are made out of low alloy and gears will break under load. That is why their gearbox is cheap and it will not work for our project. +100 same experience. You are not flying on it. But it make you hurt...
by staska
Jul 26 2017 9:44am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

Yes and no . It is ok to use leg from 2hp outboatd motor. And as must you still need a prifile, not a sheet. Battery 600 eu for unit buildfrom tesla batteries. For 2 kwh.
by staska
Jul 26 2017 8:38am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 65098

Re: Electric Hydrofoil/E-Foil

A nice and long thread you have here. Just my two cents - sometimes simplest solution is the best solution. Why not use an outrunner, and hide it inside board - and for drive use similar system as in ordinary, gasoline outboards - straight angle gearbox. So much cheaper, safer for electronics and ea...