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[botchit]

Hello all.
          Hope you all got most of what you wanted if not all for Xmas.

A question i meant to ask a while ago has just popped up in front of me again.For Xmas i got a build of an O.R.S.V. It is not one that is a specific copy of existing vessel i.e i can pick and mix the superstructure.

Whats puzzling me though is although it came with a motor theres no information to size or performance on it or instructions.

 The vessel is 24 inches in length approx 6inch across the beam and similar in height at top of superstructure. It's very light in weight and I intend to change the motor for another, therefore how do i work out the size of motor and ESC? Is there a rule of thumb guide for motor to model size?

Also, can i buy crystals the same as the ones in the build I am finishing for the receiver so i only need the one hand set?

Regards as ever Botchit :)

[Robert Davies]

......can i buy crystals the same as the ones in the build I am finishing for the receiver so i only need the one hand set?

From the info you've supplied in your post, I don't see why not - On the assumption that you can only sail one boat at a time.

-Rob

[Circlip]

Can you expand a bit botchit.  If its a kit,and the motor came with it, why change it? The motor came with the kit, so what do the instructions say with regards to battery size/type. If nothing at all, contact kit manufacturer. Don't understand problem with crystals. If the whole thing is an ARTF,(almost ready to float) chances are the R/C is 27Mcs AM, but the bumpf should tell you, but whatever, crystals are available for 27Mcs AM, and 40Mcs AM or FM, but why do you need extra?

[botchit]

Circlip :-
 My reasons are i dont want to swap things from one model to the next  and back again also i dont want to put a 30 Esc in when a 20 would do..So on that count being a rank amateur i do quite often need advice.I am hoping to join local club in Jan but till then i dont know personally  other modellers, hence the continual   questions  which i am grateful to all responces to. As for contacting the vendor it is what i really should do but i will still be wondering if there is any form of ratio when deciding what motor, esc e.t.c to use in future.Non the less i appreciate the input.
Cheers Botchit

[Shipmate60]

botchit,
What kit is it.

Bob

[barriew]

Botchit,

Bob just asked the question I was going to ask about the kit. As far as crystals are concerned, if this is not an ARTF model with a receiver etc built on one circuit board, but one into which you are going to put an Rx to match a Tx you already own, the the answer is yes you can buy another Rx and get a crystal to match the one in your Tx. A slightly better solution would be to buy a pair of crystals on a different frequency. Then you have some flexibility when you get the water to sail if there are others already sailing. It is easy to change crystals in both Tx and Rx (provided your Rx is accessible )
This ONLY applies if you have a TX/Rx already with interchangeable crystals.

Regards

Barrie

[Circlip]

botchit, hope you didn't think I was trying to make you look silly, reasons for all questions is trying to get a total picture of what you are trying to achieve, you've got the full picture but a least one other reading this thread is confused. We all had to start somewhere so your questions will NEVER be regarded as stupid, well not by SOME of us. In the past when the majority of power plants was IC, you could say for X length x Y beam use Z engine size. Electric power had only a few major manufacturers so choice was limited, nowadays the whole situation has been reversed and the vast range of electric motor manufacturers have complicated the issue to the point that two people running the same boat can have totally different setups BOTH which work for them. Thats before you start on propeller sizes?

[Shipmate60]

botchit,
As a general rule for that size of model I would use an MFA 385 motor running on a 7.2  Battery pack with a 35 mm Rivabo brass prop (or similar).
A HiTec 10amp Speed Controller with a 7 amp fuse will have her running fine.

Bob

[cos918]

from the sounds of it you have the HFM oil rig supply vessel. is it this one http://www.modelboatmayhem.co.uk/forum/index.php?topic=5854.msg67388#msg67388
john

[botchit]

Circlip :- never gave it a thought was happy for the info cheers. I am vague at times i know it and its been a little hard to provide the correct details as the model was at home and ive been mailing from work over the yule tide. Non the less  Bob & John spot on thanks found my glasses and some bits of paper . Motor380 batteries 7.2 it says preferably spli in two. The prop has only two blades can i change this . Every thing else ill go along with. :) :)
Thanks to each and every one for bailing me out again

[cos918]

hi ,OK so we now know its the hfm ORSV.
For prop i would be tempted to go for a 40mm 4 blade prop from prop shop.Check with Simon at prop shop his advice is second to none. as for prop shaft not sure what the kit ones are like. if poor possible think of a new one could try westbourn models.
For motor . there are the 380 and 540 but you can get better than those nowadays. Have a look at some of graunper units say may be a 400 or 500 or a 500E.
for speed controllers Electrionsie are good but you can get similar for less .Try mtroniks viper range what i use never had a problem. Obviously you will need to do a current draw test with your new motor/prop in water to work out what ESC to go for.
best of luck john

http://www.prop-shop.co.uk/OLDsite/index.html

http://www.westbourne-model.co.uk/