Cozy F1 T800 - houtbouw F1 tunnel

[Dim L]

The outboard will be a custom build with flexas.

: thumbsup:: thumbsup:: thumbsup:

Actually with a custom build outboard you will save a large amount of money so as to buy your electronics.
I believe that you could save about 250 € assuming that you would buy a MHZ 1/5 outboard which costs about 350€.

 

[Dirk Jan]

Yes, I know the MHZ unit and it certainly looks nice. But I read about some issues regarding the gears. That's why I want a flex shaft.
Below €350,- should definitely be possible. However, parts prices went up a lot lately.
I might start the CAD design of an XL electric outboard. I will keep you guys updated if there's any news [emoji41]

I the meantime I will enjoy my T800!

 

[Unusual RC]

Colin (@Returntohome also active on this forum) did some pioneering on custom designed outboards making use of gears for the sake of scale realism.
I had my thoughts about it, but wonder well he succeeded!

Angular gears always have more friction than straight ones.
I have no idea how that compares with a flex shaft.

 

[Dim L]

Indeed Michael, @Returntohome has done some excellent work with high degree of realism.

But, as @Dirk Jan said and I ve read myself from various sources, gears seem to be more vulnerable to wear compared to a flex shaft especially in high rpms.

Offshoreelectrics.com also categorizes the outboards into a) scale outboards with gears and b) racing outboards with flex shafts, implying that flex shaft outboards are more suitable for racing (and higher rpms probably). Although this does not necessarily mean that offshoreelectrics.com is right ex ante, it gives you a hint of what approach is more suitable for your project.

 

[Dirk Jan]

I totally agree about the geared / flex shaft outboard drive application. I have never seen a geared outboard behind a competitive racing hull.
Not that I'm building such a hull with the Bernico.. but a geared outboard is too much hassle for me at the moment, to build myself.

 

[Dirk Jan]

Vandaag weer gevaren, het was alweer een tijdje geleden.
Er stond veel wind, dus alleen met de wind mee kon ik volgas. Twee keer een klapper gemaakt, maar beide keren precies een 360 en weer op de drijvers.

Met de 44mm 1.6 pitch prop, haalde ik 96km/u. Een nieuw record.

Hier een filmpje van vandaag.

 

[Dim L]

Excellent sailing... Only 4 kmh for the 100 kmh barrier but officially in the 60 mph club. Well done Jan!!!
First time with an 1.6 pitch prop I think. New spot?

 

[Dirk Jan]

Thanks [emoji106] Yes, close to the 100 km/h. I guess with a higher performance lipo, I could crack it.
But.. as Eric mentioned before, the higher the speeds, the bigger the crashes.
I check the hull carefully after each crash and I notice a very light paint crack at one of the sponson bottoms. I will strip the paint to check the actual damage.
What's worse is that I destroyed 2 steering servos already. The impact after a flip destroys the gears. I'm missing a servo saver here, just like rc cars have.

I might go down a little on the setup. Keeping the boat on the water saves money!
On the other side, the 120A esc and 3674 motor are holding up great, even with the aggressive props and warmer water temps.

This is the same spot as previous videos. Just from another shore angle [emoji3]

 

[Dim L]

This is indicative of the impact power at high speeds. Metal gear servos I guess. I have very cheap (12 €) Chinese 35 kg servos and until now I am very happy (of course not tested at 100 kmh crash).

Have you ever noticed similar cracks to your small Cosy that is constructed similarly? I say that because you may be right and possibly 80 kmh might be the speed limit to keep the hull safe.

 

[Dirk Jan]

The T800 is built stronger. Thicker wood, more ribs and stringers and thicker laminate.
It also weighs 2x more than the Cozy F1.
I guess the maximum speed is not easily linked to the build quality.
It really depends on how unfortunate you crash the hull.
For extreme strength, a carbon (kevlar) hull would definitely be best.

 

[Dirk Jan]

De T800 krijgt het nodige onderhoud. De harmonica rubbers van de stuurstangen zijn gedroogd en gescheurd.

De haarscheurtjes in de linker sponson zijn kaalgeschuurd. Het gedeelte heb ik afgeplakt en daarna met een nieuw glasweefsel gelamineerd.

Aan de onderkant van de spiegel zag ik ook een haarscheurtje in de lak. De spiegel krijgt het flink te verduren als de romp na een flip weer op het water klapt. Ook hier heb ik de boel kaalgeschuurd en 2 weefseltjes de hoek om gelamineerd (met een radius).

Nu het weefsel goed laten drogen en dan kan ik de romp weer afwerken.

 

[Dim L]

Good job Jan!

 

[Dirk Jan]

Ik heb de bouw van de Cozy F1 T800 in een slideshow gezet. Voor de geïnteresseerden, hierbij de link:

 

[Dim L]

Suberp!! I d always loved construction presentation videos. They are very intuitive. I think I could make one for my outboard.

 

[Dirk Jan]

Yes, nice idea Dim! I would be interested [emoji106]

 

[Dirk Jan]

Vandaag ben ik bij het RC Powerboats evenement in Hank geweest. Ondanks het weer een leuke dag met veel snelle boten op het water. Ook een paar forumgenoten ontmoet [emoji106]
Voor mijn F1 tunnels stond er eigenlijk teveel wind / was het water te ruw. Toch even een lipo leeg gevaren. De eerste flip ging zonder kleerscheuren, maar de tweede keer dook de tunnel op snelheid ineens het water in. De kap klapte open en is helaas aardig beschadigd. Een paar scheuren erin en lakschade. Gelukkig is deze nog wel te repareren.

 

[Unusual RC]

Had het treffen in mijn agenda staan, maar vond het weer te slecht. Jammer, hopelijk volgende keer ook aanwezig.
Zonde van de schade!

 

[Dim L]

Nice pond, nice boats and it seems well organized !
I am so sorry for your cowl. It is hard when you ve spent hours for making it. The trickiest part would be the painting. Is it necessary to strip off the whole paint work and the decals?
Next time you ll probably take with you the deep v wild thing which is capable of dealing with tougher water!

 

[RenBo]

Hoi Dirk Jan, ik ben nog in bezit van een filmpje van je eerste flip. Indien geïnteresseerd. Mag hem hier niet uploaden, te groot...
Gr. René

 

[Dirk Jan]

Hoi René, ik ben zeker geïnteresseerd, ik stuur je even een persoonlijk bericht hier op het forum [emoji106].

@Dim: the damage is very unfortunate indeed, but it could have been worse. I am thinking now to make a somewhat quick fix, without totally repainting the cowl. Just fixing locally with some carbon weave and paint. It will not be as clean as a total repaint, but I foresee another crash in the future [emoji28] and I prefer to keep the boat on the water instead of keeping it spotless.

Also, I will continue my Wild Thing build, so I have to spend my time wisely [emoji3]. A mono is definitely better at rougher water and wind. I could clearly see that yesterday.

I hope to join the next event in April, with my F1 Tunnels and Wild Thing [emoji106]