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>> Home > Members > octman
Registered
10th Apr 2016
Last Online
21st Aug 2017
octman

Member Stats
Stats
Member No. 3722
Registered 10th Apr 2016
Last Online 21st Aug 2017
City Worcester
Country United Kingdom
Boats in Harbour 0
Sailing Locations 1
Forum Posts 84
Photos Posted 9
Likes Received 23
Likes Given 163
85 Total Posts
Sailing Locations
Worcester Model Boat Club
Since: 16th Mar 2017
Harbour
Empty Harbour
Commander
Ranks Points
Fleet Admiral 1000
Admiral 800
Captain 600
Commander 400
Lieutenant 200
Sub-Lieutenant 100
Chief Petty Officer 50
Petty Officer 25
Seaman 10
Apprentice 2
Recruit 0
82 points away from Captain!
Points
Activity Worth Awarded
Boats in Harbour 8 0
Forum Thread 5 130
Forum Post 2 168
Event 8 0
Photo Gallery 10 0
Photos Response 3 0
Video Post 15 0
Video Response 3 0
Build Blog 20 0
Blog Post 5 0
Blog Response 3 3
Sailor 8 8
Guestbook Post 8 0
Liked Posts 1 163
Received Likes 2 46
518 Total Points
Good Conduct Medal
This member donated!
United Kingdom
Recent Posts
Logos etc by octman Commander   Posted: 7 days ago
Thanks a lot. Plenty of info there to ponder on. All very interesting. It's amazing what this forum comes up with when someone asks a question. If I used vinyl logos do I still need to varnish over them as I would a water slide transfer? Thanks again Chris

Logos etc by octman Commander   Posted: 8 days ago
Hi there, for my current build I am toying with the idea of some fancy multi coloured, written logos along the sides, and on the transom. These will be to my own design once I can find a suitable multi coloured font. Any ideas how I would then create these and get them onto the model? I can only think of just printing them off and sticking them on the boat, but I can see that being a disaster. I don't think it will be too much of a problem designing them but after that I am floundering. Chris

What motor have I got? by octman Commander   Posted: 15 days ago
Thanks Dave. Chris

What motor have I got? by octman Commander   Posted: 15 days ago
Thanks Doug. The gear you refer to is actually just part of the prop shaft universal joint which I hadn't taken off. What about the impeller visible in some of the pics through the hole in the casing and the slightly different front bearing?Does this signify a difference between that motor and the other two? Chris

What motor have I got? by octman Commander   Posted: 15 days ago
Right, I hope this works! The can length is 57mm,can diameter is 35.7mm and the shaft diameter is 3.18mm. Photos are attached,fingers crossed.the motor with the impeller,if that is what it is, also has a bronze(?) front bearing, different to the other two. In one of the photos of one of the terminals there is a small wire coming out from the inside, matched by a similar wire on the other terminal. Does this signify that there are internal capacitors fitted? What does the small red plastic thing on the rear signify? Chris

What motor have I got? by octman Commander   Posted: 15 days ago
I thought that would be the case. I will get my macro lens out then and bang off a few pics!

What motor have I got? by octman Commander   Posted: 15 days ago
I have 3 apparently identical brushed motors. One I bought new, one came in a model and one was given. The one I bought recently is a Graupner Speed 600, but neither of the others have labels on them, although everything else is 99.99% the same as the new one. The only obvious difference that I can see is that one of the older ones appears to have an impeller in it so that the commutator is not very visible. Am I to assume that this might be another version of the Speed 600, that needs to be cooled a bit more than a standard one? Anyone know? Chris

correct size of wiring by octman Commander   Posted: 16 days ago
I apologise if this has already been covered here but I am now at the point of installing the motor in my new model. The motor is a Graupner speed 600, and the specs are : Nominal voltage 8.4 V Operating voltage range 4.8-9,6 V No-load rpm 15500 No-load current drain 1.8 A Current drain at max. efficiency 11 A Current drain when stalled 70 A Max. efficiency without gearbox 75 % If I use 8.4 volts what size wiring do I need? Do I need to cater for the 70A current or the 11A current, or somewhere in between, with a fuse? Sorry to be a bit dim on this but I am confused (with most things these days!) Chris

Sea Queen refurbishment by octman Commander   Posted: 24 days ago
Oh dear, I can't imagine anything more inconvenient than having a disabled index finger! It gets used for most things. Are you a lefty like me or right handed? Still a problem whichever. And I thought I had a problem last week with a modelling knife in my foot! Get well soon Colin.

Sea Queen refurbishment by octman Commander   Posted: 28 days ago
Back to the polyester! I have just read an item about coating wood with polyester, quoting an apparently well known Australian surf board maker, saying that there are chemicals in the wood that prevent the soaked in resin from setting. It sets on the surface and all appears well, but not deep down and it may all become detached some time in the future. Too late for me though as I have just done mine! Chris

Sea Queen refurbishment by octman Commander   Posted: 28 days ago
Thanks for the reply Colin. You originally posted that you used polyester. Is that the same as styrene or a different thing altogether? Also, how runny was it when you applied it to the hull, like water or thicker? Chris

Sea Queen refurbishment by octman Commander   Posted: 29 days ago
Hello Colin, regarding your use of polyester resin inside the hull, did you use the standard mix and consistency or did you thin it,if so, what did you thin it with? Was is like water, or more "gloopy"? I have my supply of polyester ready to go but do not want to make a mess of it. Chris

Motor Cooling by octman Commander   Posted: 30 days ago
Not an expert on this but I think the usual,(easiest) way is via a water pickup behind the prop and then exhausted though the side or whereever looks right. I have heard of motors or ESC's being fitted with temperature sensors that turn on a pump if the heat starts to build up. I think most pumps will only work for a short period at a time. Chris

3 blades v 2 blades on air boat by octman Commander   Posted: 1 month ago
If I know that the size of the 2 blades prop is 9 x 6, how do I convert that to a 3 blade size? Is it the same pitch but the blade length is only two thirds as long as one of the 2 blade's blade? I know the result is only a starting point but we have to start somewhere. Chris

Warning by octman Commander   Posted: 1 month ago
That reminds me of when I was having a woodwork lesson at school(a very long time ago) when I went to pick up a plane that had been put down on it's side. My thumb went up the blade! Now that was bloody! Obviously this leopard has not changed his spots even after 60 years! Any one got a 16th century suit of armour going cheap? Chris

Denatured Alcohol by octman Commander   Posted: 1 month ago
Thanks Dave, I will do a build blog when the model is finished. It is a Jenny by Aero naut. It is supposedly a simple model to make, and so far it is proving to be so, except for a few parts of the construction which are not very well explained in the instructions. If there is the possibility of misinterpreting some instruction, guess which method I use? It's only when I get to the next stage that I find I have gone wrong! I do read the instructions first but some parts are, to me at least, unclear. I have been able to overcome the problems I have created, although the model will only be 99.99% as per the plan. I have some photos of the build so far but not a complete reference. Chris

Denatured Alcohol by octman Commander   Posted: 1 month ago
When I have got the DNA and epoxy/polyester resin sorted out and I want to coat the inside of the boat, do I just do the hull, or should I wait until the deck is on? Chris

Denatured Alcohol by octman Commander   Posted: 1 month ago
Thanks Dave, I must admit I did misinterpret your note about your use of acetone. In the you tube link he thins his resin down to the consistency of water, and it then takes about 4 hours to go off, which is what I want. Looking at the Bonneyman website it seems you have to have a government authorisation to obtain some types of denatured alcohol. Their site also points you to the gov.org website which explains it all in full. Apparently for low volume users it is less restricted, particularly if you are a school! Chris

Denatured Alcohol by octman Commander   Posted: 1 month ago
I think this has got a bit off the track. I was asking about denatured alcohol, not acetone. DNA is ethanol and can be used to thin epoxy. see this You Tube video : https://www.youtube.com/watch?v=ujk-wBQDUSk

Warning by octman Commander   Posted: 1 month ago
Thanks RN, There wasn't a lot of blood, just a soggy sock! After the initial surprise and resulting exclamation a quick application of a sticking plaster or two and all was well. A bit of a limp for a few hours but all seems fine now, especially as I have now had my tetanus jab and got my "I've just been a brave boy" sticker from the nurse. Trouble is, putting the plaster on I twisted my knee and now have a problem driving my car! I think I ought to retire to a dark room (preferably padded) for some time until this disaster time goes away. Chris

Warning by octman Commander   Posted: 1 month ago
The knife blade went in horizontaly somehow, straight through the leather, not the sole, into the side of the foot. No idea how. Chris

Warning by octman Commander   Posted: 1 month ago
When all the bric a brac and miscellaneous "stuff" on your work bench accidentally takes a dive for the floor, find and pick up your knives first, otherwise your might find them later by standing on them. Tetinus jab booked for this afternoon! I feel a "Doh" coming on. Chris

Denatured Alcohol by octman Commander   Posted: 1 month ago
I am trying to get some of this stuff to dilute my epoxy resin with. I understand that it comes in many forms, including methylated spirits. Can anyone out there who knows these things advise me if they would all be suitable for thinning epoxy resin (Z Poxy Finishing Resin to be precise), or if there is a preferred version, and a source? If I used meths would the diluted resin be purple? Chris

Skimmer from Mobile Marine by octman Commander   Posted: 1 month ago
Hi Dave, Thanks for that. Not started it yet, am half way through another build at the moment but there's nothing like planning ahead! Where about's along the hull do you suggest the C of G ought to be, or thereabouts? Looping the air boat is not on my agenda! What overall weight does yours work out at? Sorry for all the questions. Chris

Skimmer from Mobile Marine by octman Commander   Posted: 1 month ago
I have just purchased the hull and deck from Mobile Marine Models of their Skimmer air-boat. Any out there got any info regarding the build of this? Mainly, is there any internal construction to do, to accommodate the receiver and servo etc, and to give it a bit more rigidity? I have a motor on order following Dave M's advise, and I have some ideas regarding the mounting of this and the steering arrangement but just not sure about the insides. Chris

what fittings for a plane prop by octman Commander   Posted: 2 months ago
Thanks Dave. Certainly got a weed problem, so will give them a call. Chris

what fittings for a plane prop by octman Commander   Posted: 2 months ago
Ref Dave M's airboat pics, did they come with the hull and the deck, or did you make the deck yourself? Mobile Marine only seem to sell the hull, and the two boats in your photos appear to have the same decks. Chris

Steaming ply- good idea or not? by octman Commander   Posted: 3 months ago
Thanks for all the replies. I had forgotten all about the rolling and scoring techniques-well over 35 years since my last model boat build. I have now rolled a couple of small parts and successfully fitted them, so thanks. Haven't worked on the transom yet but the curve is not very great so I think I will giving the scoring method a go. Chris

Steaming ply- good idea or not? by octman Commander   Posted: 3 months ago
The boat I am constructing at the moment, Aeronaut Jenny, requires a few ply parts to be installed that need to be curved. These are not the hull sheeting etc as that is thin enough to curve without problems, but the transom and a few other small parts also need to be curved slightly to fit. I could glue these parts in place using clamps etc to force them into the correct shape, or steam them. But the question is- will the steaming de-laminate the ply. The other parts on the boat that I have steamed, the stringers, are not ply so there was no problem there. Chris

ECS rating- confused by octman Commander   Posted: 3 months ago
Thanks for that Doug. As you say, I nearly answered my own question, but measure twice, cut once as they say. Chris