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Author Topic: los angeles class 1/80th scale static diving rc submarine  (Read 27096 times)

U-33

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #75 on: May 26, 2012, 04:54:47 pm »

Ye Gods...the motor's too fast, the motor's too slow...unless Ben is different to the rest of us he's got fingers and thumbs on his hands. One thumb controls the stick on the tx...that controls how fast the motor goes.

How much easier can it get?
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Rich

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Andyn

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #76 on: May 26, 2012, 04:58:05 pm »

Yes, but what's the point in putting an inefficient amp hungry motor on something that doesn't need it? Besides, that motor won't turn that prop without getting rather warm...
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unbuiltnautilus

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #77 on: May 26, 2012, 05:58:40 pm »

The 540/1 is a fairly low drain motor, okay, the prop is somewhat bigger than desirable for a direct drive set-up. However, the Electronize Speed Control going in will allow him to dial down the throttle output to 25% of its normal output, 7500rpm at 6v or 15800rpm at 12v, offload. bringing that down to either 1875rpm at 6v or 3950rpm at 12v, a bit more desirable, even if the prop size is a bit big. worst case, grab that nice expensive prop and twist some of the pitch off of it :o
My bottomless box of bits that KK keeps scrounging out of is starting to show the bottom otherwise :-)
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #78 on: May 26, 2012, 08:54:10 pm »

would have thought one of your low drain 600 motors to have been a better bet alan ? dont see much point buying an expensive & quality prop to then " tweek the pitch " off somewhat ? would be better to fit running gear thats up to doing what you require of it in the first place , if you havnt got enough money then save until you can afford to do the job proprely ! !
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bikerdude999

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #79 on: May 26, 2012, 09:03:05 pm »

Sometimes saving isn't an option, if I saved to do it properly all the time I'd never get anything done, as I can't justify spending on things, make do with what you've got is sometimes the only way.
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #80 on: May 28, 2012, 12:07:58 am »

right first off im very very very confused secondly bikerdude is right and lastly alan you were the one who saidi should start scrounging stuff off people , kinda backfired didnt it  {-)

so back to the bit that im scratching my head about so what am i doing new motor but a ring on existing one alter the prop use gears keep same motor ? %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %% %%
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #81 on: May 28, 2012, 07:24:42 am »

ben , i think a better suited motor is going to be of more benifit , dont think ive got any spare torque rings for a 540 / 600 can sized motor i will look later . have you designed the mounting tray so its easily removable in the event of needing to service / change components ?
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #82 on: May 28, 2012, 12:07:04 pm »

Only a few posts up he's talking about his next project, a hull from Deans! I think Ben is just living up to his nickname.

If the pennies are really that tight, then he can always flog on the existing motor to offset the new purchase. The 555 motors are only 9 new from MMB, so I expect Andy's might be a little less?

triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #83 on: May 28, 2012, 05:19:19 pm »

i think its a classic case of too many projects on the wants list , and a very limited pocket money budget? although many of us are capable of building more than one model at a time projects can run away with our hard earned pocket money !
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #84 on: June 02, 2012, 08:51:36 pm »

yello gang the build was temporerily deraild due to school but have A week off so  ive looked at what i need to do and strangly enough what i need to do is to restore another boat so i can sell it to buy a geard motor or one of andys if suited to the job  :-))      am working on the aft section then seals then need to make some o rings and its plain submerging from there on  %%



                                                                        ta kk
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #85 on: June 02, 2012, 09:20:15 pm »

ben didnt you say there is somewhere you could buy O  rings locally ?
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #86 on: June 02, 2012, 09:41:09 pm »

not complee just the material in lenghts i have to cut and glue them
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #87 on: June 02, 2012, 10:14:26 pm »

I prefer one piece moulded o-rings- less risk of failure.

derekwarner

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #88 on: June 02, 2012, 10:54:14 pm »

KK......using super glue to bond nitrile o-ring cord is  >>:-(....when the o-ring is compressed in the cavity....yes the nitrile material will compress, but the glue is far harder & will attempt to fracture  <*< .... Derek
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #89 on: June 02, 2012, 11:13:07 pm »

you have good point but the only glue on the o ring will be the tinninesst dot of superglue the rest will just push together and seal   i will test this as 1m is only about a 1/2     but am confident it will work
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #90 on: June 03, 2012, 10:43:51 am »

you will be betteer off buying a ready made o ring , im sure there will be something available " off the shelf "  what diameter is the end cap ? 
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U-33

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #91 on: June 03, 2012, 10:50:24 am »

Like the guys are saying, be very careful when you make an O ring, Ben...the cuts have to be made perfectly square, and you only need to apply the tiniest drop of superglue to the ends to secure it, any more will only end up as a hard lump and will let water into the wtc. Trust me...I've been there and I've done it. And I've failed...miserably.

If in any doubt, buy a ready made one, they cost but a few pennies and will save a lot of problems in the future. Or have a chat to any of the lads at Alfold next week, they will help you out.



Rich
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Rich

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Davy1

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #92 on: June 03, 2012, 11:05:26 am »

Yes, I agree with what everyone is saying also.

I used to be an enthusiast for O ring cord but I now also go for the ready made ones.

They are not expensive, work better and are quite easily available.

David
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BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #93 on: June 03, 2012, 12:09:30 pm »

i would prefer to make my own i dont want to waste 4 on an oring ready made and then relize it dont fit the end cap
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U-33

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #94 on: June 03, 2012, 12:25:38 pm »

Then measure the end cap first! Measure it...check your measurement...then measure it again. Make sure it's right...

Rich
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Rich

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Marks Model Bits

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #95 on: June 03, 2012, 12:58:40 pm »

Then measure the end cap first! Measure it...check your measurement...then measure it again. Make sure it's right...

Rich

Then take the end cap & tube with you when you go and get the O rings.......
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triumphjon

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #96 on: June 03, 2012, 02:48:46 pm »

thats what id have sugested mark ,  take the end cap & even the tube to get the right sized seals
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Subculture

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #97 on: June 03, 2012, 04:26:37 pm »

What's the diameter of the tube 100 or 110mm?

Extruded acrylic tubing is nearly always 3mm cross section, and the internal tolerance is usually reasonable, but can be very variable- some suppliers are better than others.

To size an o-ring, remember the diameters specified are always plus double the o-ring thickness. For instance a 90 mm  o-ring 3mm thick will be 96mm overall diameter, and that coincidently is the size of o-ring that would be ideal for 100mm acrylic tube.

For 110mm you would want a 96mm o-ring if using 3mm cross section. The diameter of the endcap groove should be about 0.6-1mm greater to allow the o-ring to squish inside the tube about 15-20%. The same grovve should also be about the same amount wider, as the rubber extrudes but doesn't compress, so you have to ahve somewhere for the rubber to squeeze into. So for instance the endcap groove for a 100 mm tube would need a groove of about 90.6-91mm diameter and 3.7-4.1mm wide.

Most people use nitrile o-rings, but you can also use silicone o-rings. The latter are softer, and better if the tubing accuracy is a bit wavy. You mustn't use vaseline or silicone grease on silicone o-rings though- it rots them. Lard or vegetable oil works great. Nitrile will take pretty much any mineral or silicone based grease/oil.

One final point, make sure the tubing edge is chamfered with no sharp edges, to avoid slicing the seal.

BailingBen

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #98 on: June 03, 2012, 07:27:00 pm »

ok but i cant just take the  encaps to an online shop and cant find anywhere that sels em whole im stil confident i can do it and if it dosent work its no hassle i need to get some of the stuff for something else any way
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tattooed

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Re: los angeles class 1/80th scale static diving rc submarine
« Reply #99 on: June 03, 2012, 08:43:17 pm »

ben you say if it don't work no hassle but surely if it don't work it'll leak which means your sub will submerge but wont surface which means lost sub and soggy electrics ? i know which way i'd go
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