Todays Boating

[Richard SimpsonModerator @richardsimpson88330]

I’ve used Halfords grey primer frequently in the past as a suitable navy grey.

[ashley needhamParticipant @ashleyneedham69188]

Undercoat grey great for landers and so.on, but never fancied it for warships myself.

Frankenboat went very well, considering the weight of the carrier hull ( about 5 by 30 inches) bothered hope for the project. A proper hull will be probably be less than half thexweight of the carrier hull and a better faster shape.

Nice day at ‘t pond. Sunny and warm. All boats performing satisfactorily.

Ashley

[ashley needhamParticipant @ashleyneedham69188]

Nice day, last Sunday. Almost zero wind, but good for the SRN4 and Moana rower.

Stingray looked super in the sun against the flat calm.

All other bods boats rowing or zooming well…no fails or breakdowns. Result.

Ashley

[Colin BishopModerator @colinbishop34627]

Great photos Ashley.

Colin

[ashley needhamParticipant @ashleyneedham69188]

Cheers Colin. There was a super atmospheric heavy mist…almost like fog, on Sunday, early morning but i didn’t have a proper camera to make the most of it…only had the phone.

It’s the rut  now…all the big deer are mooey and fighty  fighty. Have to keep an eye out in case one is behind you and another opposite. The pond is no obstacle if they decide to clash….

Ashley

[ashley needhamParticipant @ashleyneedham69188]

I am hunting for small brushless motors..ie..smaller than 28mm.

The convention ( if no outside diameter is given) appears to be to give the diameter and length of the stator as a number…that’s why the small 28mm gold outrunners wte marked 2215 or something.

I can see 1806’s, so about 23mm o/d  and smaller at 1403 or thereabouts and at around 2700Kv fot 2 to 3 inch props, but they are reasonably expensive. The mounting holes in some cases are only 10mm apart and for 1.7mm screws! Can i drill a triangle of 2mm holes that small for a mounting plate?

The boat project would need 4 motors and 4 inch or thereabouts three blade props…or perhaps 3 inch at those revs…but ANOTHER project would need three…plus at least one spare..just in case..and it all becomes expensive at over £80. I suppose that’s a lot of motors of course…but the props ain’t cheap either as a lot of them are designed to be screwed to the rotor with tiny weeny screws.

The boat in particular needs a bit of oomph and I am not sure the small brushed motors will provide sufficient power together the “cover” look.

The second possible project has three props in a line sideways and really needs 3 or 3.5 inch props to keep the size down…and only brushless will deliver i think….would need the revs with small props.

Ashley

[ashley needhamParticipant @ashleyneedham69188]

Just ordered a dozen 19mm o/d outrunners of 2400Kv.  These have a post fixing to bolt a prop to rather than the two tiny screws a lot of the very small motors have. Cost…mmmm…just short of eighty quid…but that’s a lot of motors for this and future builds. . Need spares etc etc.

Also ordered 5 sets of 4x cw/ccw  3 inch three blade props ( they were very cheap).

Need to look for 8 or more esc now. The small motors are only about 70 watts, so the esc do not need to be 10,000A or anything silly…and even when using four in the first project, the current draw will be excessive overall.

Ashley

[Richard SimpsonModerator @richardsimpson88330]

Just over £6.50 per motor isn’t bad going and, at the rate you build models you’ll soon be running out again!

[ashley needhamParticipant @ashleyneedham69188]

I suppose so Richard. They were a tad more than that, but you are right.

Such a feisty motor/prop at that small size does open up models previously dismissed due to the escalating size if larger props are used.

The Russian Zubr landing craft was the second model choice, but with a 2:1 length/width ratio, having say 4 in props ( in cowls 4 1/2 inches in diameter gives you a width of about 14 ish inches (as the 3 fan cowls are side by side at the rear) and 28 inches long. That’s quite a large storage box. The srn4 is about 11 ish inches wide and 22 ish inches long, so quite compact…BUT the props are not all in a line like the Zubr and thus the smaller size. 3 inch props however brings that right down to a more storage friendly dimension.

Shopping for esc’s now.

Ashley

 

 

[ashley needhamParticipant @ashleyneedham69188]

Some things don’t add up.

Cheapest 30a yellow shrink wrapped esc ( which we have all been using at the pond and which have been very reliable) is anywhere from £6.50 to £9 odd quid…but you can get a yellow esc, 28mm outrunner, prop adaptor and prop for about £9.50 or so….?

Other than the esc is non reversing, this package is silly value for money. The motors are powerful and come in 1000, 1400 and 2200Kv. The lack of reverse may be seen as an issue, but we all have so many craft now without reverse and its not an issue once you get used to it. The 1000kv motor will turn a 50mm prop on 7.2v at its max current…impressive.

Ashley

[ashley needhamParticipant @ashleyneedham69188]

For the new project:

3 inch props have arrived and they are very sexy!  Esc reciever lead combines have arrived…not seen this type before…but there again i suppose i have only ever used a simple Y lead before. Up to 5 leads into one!. Nice.

Waiting other bits but I have completed the initial plan drawings.

Ash

[ashley needhamParticipant @ashleyneedham69188]

Have been modifying the Mintanic..

Namely finally sealing off the opening underneath the slot in rear decks to stop water flooding in.

Not normally an issue, but the last couple of Sundays have been rough, and although the Mintanic doesnt mind it rough, the lack of a seal around the slot-in rear decks means water it let in.

Hopefully this won’t happen again, and as the fore deck is glued in, and the lift off top is up high then i should have no problem in sailing in a stiff breeze.

It has meant modifying some of the decks regarding the plug in masts…but easy mods.

I will also take the internal ballast out and stick strip lead underneath the boat to further lower the c of g….MIGHT even put some bilge keels in place…

Ashley

[ashley needhamParticipant @ashleyneedham69188]

Really really windy yesterday Sunday.

Mintanic performed above expectations and the 340g strip ballast strip under the hull was visibly a marked improvement over having sheet lead internally. Less rolling and a (slightly) more upright demeanor when the wind was broadside.

The new sealed off rear end worked as planned but there was water inside, having been blown over the top of the boat due to the extreme conditions. This has not happened before.

I might partly fill the stern space with foam to stop it filling completely with water although I don’t suppose the extra weight makes any difference at all.

Large LCM was on standby but it was cold and we went home a bit early. In point of fact, the wind managed to blow the lander and its storage box it was sitting on over …fortunately causing only  minor damage easily fixed and displacing a few hot-glued troops.

Peter had his chunky fishing boat out which shrugged off the wind with ease.

Ashley

 

[Richard SimpsonModerator @richardsimpson88330]

Reminds me of blustery days down at my pond in West Yorkshire.  We used to enjoy going out in adverse conditions to ‘test’ the seakeeping abilities of the boats.  I have  a Dean’s Marine HMS Cossack that used to be assigned ice breaking duties, which it performed very well.  Sadly all just about finished now.  The club has contracted into just a handful who seem to arrive late and leave early so makes my two hour journey a waste of time and considerable expense in diesel.  Open days are down to one a year (At the moment, fall outs with the council might see the end of that as well) and no away events are attended.

[ashley needhamParticipant @ashleyneedham69188]

Shame Richard. There’s only 4 of us regulars at the pond, with occasional extras, but as we are not a club theres nowt to dwell on there.

Today nice but a bit chilly. Had the German lander out.  Noel turned up with his £40  Perkasa which he is restoring. Has a something-perm motor in it…about the size of a tin of beans, but it goes quite well. Draws 11A according to my watt meter…6 cell stick and what looks like an X45 prop.

 

 

[Richard SimpsonModerator @richardsimpson88330]

Wow! 11A is a substantial current.  I assume the model is going at quite a speed when drawing that current.

[ashley needhamParticipant @ashleyneedham69188]

Richard. No. Speed was good but not 11A worth it think. The motor is slow revving and not turning the x45 prop fast enough.
<p style=”text-align: center;”>To put it perspective an mfa850 turns an x50 prop at about 8000rpm on 10 ish amps and on that combo the perkasa would be shifting.</p>
Colins Silver Bobber was truly excellent on the pond, performing heroicly on what was a very choppy water with unusually high chops…the wind was blowing towards us. I demo’d the Griffon and SRN4 and to be honest they were both struggling due to the raft-like nature of their hulls and the flat fronts. In particular tne SRN4 weighs very little and it was having a hard time with the wind. All boats were dry inside after..a testimony to the skill of the builders, obv…..

I took the Flying bus but didn’t dare put it in the water, it would have been blown over to short order.

Ashley

[Colin BishopModerator @colinbishop34627]

My 50 year old coaster braving the conditions at Bushy from Ashley’s camera. She was taking it green!

Colin

[Richard SimpsonModerator @richardsimpson88330]

She looks absolutely superb Colin.  A beautiful model looking her best in less than a perfect sea, can’t beat it.

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