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Search: Posts Made By: plavutka
Showing results 1 to 25 of 207
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Forum: General Q & A
Yesterday, 07:37 AM
Replies: 1
Views: 73
Posted By plavutka

Velocity weight?

In the 2004 test, it states that the Velocity 290 SC with the 496 engine weighs 4,650 pounds, while on their website the newer model is listed at 6,300 pounds.

Where does this difference come from?
Forum: General Boating Discussion
04-24-2026, 03:27 AM
Replies: 29
Views: 2,308
Posted By plavutka

@ Lukes; Are you sure everything is OK with the...

@ Lukes; Are you sure everything is OK with the engine?
What gear ratio are you using in the drive? Your engine doesn’t have a lot of torque, and if the ratio is below 1.5, that could be the...
Forum: General Boating Discussion
04-24-2026, 03:19 AM
Replies: 29
Views: 2,308
Posted By plavutka

Thank you for answer. When aproximatelly rise...

Thank you for answer.
When aproximatelly rise up VR1 and when Velocity 290SC with inboard engine?
Forum: General Boating Discussion
04-17-2026, 08:39 AM
Replies: 29
Views: 2,308
Posted By plavutka

Sorry for off topic; At approximately what...

Sorry for off topic;

At approximately what speed do you start to feel that you’re sliding by paad?
Forum: Restorations & Upgrades
04-04-2026, 01:08 AM
Replies: 737
Views: 408,890
Posted By plavutka

Instead of specialized materials for vacuuming,...

Instead of specialized materials for vacuuming, the following works perfectly well for such small parts:

Specialized vacuum film can be easily replaced with large garbage bags.
Instead of tacky...
Forum: Restorations & Upgrades
04-03-2026, 09:31 AM
Replies: 737
Views: 408,890
Posted By plavutka

https://cimg7.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg7.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/img_20240629_075430_94021c43e7516fb22e969dc8cb11d033cbe91d07.jpg
A small note from my side.

All my working surfaces are made...
Forum: General Boating Discussion
03-29-2026, 10:08 AM
Replies: 63
Views: 4,548
Posted By plavutka

No, but I have some business partners there, and...

No, but I have some business partners there, and I’m there a few times a month, mostly in Bavaria.
Forum: General Boating Discussion
03-29-2026, 09:52 AM
Replies: 63
Views: 4,548
Posted By plavutka

Using common sense, without overcomplicating...

Using common sense, without overcomplicating things:
A 430 hp engine at full throttle consumes about 130 liters of gasoline per hour.
An electric motor drawing 360 kW will, in one hour, consume 360...
Forum: General Boating Discussion
03-28-2026, 12:59 PM
Replies: 63
Views: 4,548
Posted By plavutka

No! On the cranchshaft you have by VP 430 hp...

No!

On the cranchshaft you have by VP 430 hp and this is the same like 316 KW on the el. motor shaft.
In one hour you burn 130 l/h by VP 430 at full throtle.
In one hour you burn 316 Kwh by...
Forum: General Boating Discussion
03-28-2026, 09:48 AM
Replies: 63
Views: 4,548
Posted By plavutka

My LS376-480 with just under 500 hp burn more...

My LS376-480 with just under 500 hp burn more than 130 and less than 140 l/h at full throtle.
And 430 hp: https://navaboats.com/wp-content/uploads/2022/11/V8-430-DPS-EVC.pdf




p.s.
What...
Forum: General Boating Discussion
03-28-2026, 06:46 AM
Replies: 63
Views: 4,548
Posted By plavutka

I mentioned China because practically all rare...

I mentioned China because practically all rare earth elements used for electric motors with stronger permanent magnets, and practically all the materials for manufacturing Li-xx batteries, come from...
Forum: General Boating Discussion
03-28-2026, 03:56 AM
Replies: 63
Views: 4,548
Posted By plavutka

I know cells 21700, I use EVE INR 21700 50PL in...

I know cells 21700, I use EVE INR 21700 50PL in my RC airplanes on the cells limits which it is in reall on 125 A. For the small hotliner with 1-2 S prop work I go over 200A.
Forum: General Boating Discussion
03-28-2026, 02:49 AM
Replies: 63
Views: 4,548
Posted By plavutka

The mass of the motor itself isn’t really...

The mass of the motor itself isn’t really important. The main problems are:

The battery mass and cells management. 21700 lithium‑ion cell cells are quite sensitive when soldered into a pack. A...
Forum: General Boating Discussion
03-27-2026, 12:56 PM
Replies: 63
Views: 4,548
Posted By plavutka

I’ve been wondering for a long time: Do these...

I’ve been wondering for a long time:
Do these boats have closed cockpits so they can’t help themselves by paddling, or because they’re embarrassed when they’re not going anywhere?
Forum: General Boating Discussion
03-27-2026, 01:25 AM
Replies: 63
Views: 4,548
Posted By plavutka

For the actual use of an electric drive in such a...

For the actual use of an electric drive in such a speedboat, you would need at least a 1000 kWh battery with a maximum mass of less than two tons. That might still be barely feasible, but how to...
Forum: General Boating Discussion
03-26-2026, 01:57 PM
Replies: 63
Views: 4,548
Posted By plavutka

Sorry to butt in, but there’s no magic wand here....

Sorry to butt in, but there’s no magic wand here.

With 400 hp (300 kW), this speedboat will at best reach 50 mph, and if you have a 300 kWh battery, you can drain it in 45, at most 50, and not 60...
Forum: General Boating Discussion
03-26-2026, 12:10 PM
Replies: 63
Views: 4,548
Posted By plavutka

You can’t compare a motocross engine or a car...

You can’t compare a motocross engine or a car engine to a speedboat!

With a motorcycle, you only need 55 kW during acceleration, and the average power consumption is 5–10 times lower.
With a...
Forum: General Boating Discussion
03-26-2026, 10:50 AM
Replies: 63
Views: 4,548
Posted By plavutka

300 kWh is about 400 hp, and an average engine...

300 kWh is about 400 hp, and an average engine needs around 100–120 liters of fuel per hour for that.
But 300 KWh in real it is for les than 40 minutes with power of 300 KW.
Forum: General Boating Discussion
03-26-2026, 06:46 AM
Replies: 63
Views: 4,548
Posted By plavutka

With 300 kWh, you have a similar range as with...

With 300 kWh, you have a similar range as with 100 liters of gasoline, which is too little for a boat of this size to leave a decent bay.
Forum: Restorations & Upgrades
03-03-2026, 01:12 AM
Replies: 737
Views: 408,890
Posted By plavutka

I’m asking because I personally had real...

I’m asking because I personally had real difficulties, and perhaps the following words may help. I resolved the complication by obtaining a German temporary residence, joining a German nautical club,...
Forum: Restorations & Upgrades
03-01-2026, 04:26 AM
Replies: 737
Views: 408,890
Posted By plavutka

I almost forgot to ask: How is it handled in...

I almost forgot to ask:

How is it handled in Finland regarding the registration of a vessel that uses a non-certified engine?

I’m asking because I had major difficulties registering a speedboat...
Forum: Restorations & Upgrades
02-24-2026, 11:41 AM
Replies: 737
Views: 408,890
Posted By plavutka

Put 2x45 g aramid layer betwen Al and carbon for...

Put 2x45 g aramid layer betwen Al and carbon for insulation.
Forum: Restorations & Upgrades
02-09-2026, 01:05 AM
Replies: 737
Views: 408,890
Posted By plavutka

1.) This is classic mechanical engineering, and...

1.) This is classic mechanical engineering, and the efficiency lies within the mentioned tolerances. It may be a few percent higher or lower. For mechanical efficiency, the load level does not play a...
Forum: Restorations & Upgrades
02-08-2026, 10:50 AM
Replies: 737
Views: 408,890
Posted By plavutka

If I understand your "M8" correctly like...

If I understand your "M8" correctly like question:


In both cases, the gearbox comes first, followed by the drive. Both gearboxes, yours and the Mercruiser one, most likely have a very similar...
Forum: Restorations & Upgrades
02-08-2026, 02:32 AM
Replies: 737
Views: 408,890
Posted By plavutka

But no, if the cruising speed is 60 knots. ...

But no, if the cruising speed is 60 knots.
https://boatingmag.com/story/boats/fountain-47-lightning-boat-test/?srsltid=AfmBOoqedhlcTW4cEnuYR-feGoyYZQgYTLxZ_CR02Ju7B3DxP8UGsWCk
And in practice,...
Showing results 1 to 25 of 207
 
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