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>> Home > Boat Building Blogs > Aerokit Sea Scout 'Jessica' Renovation
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mdlbt.com/28209
Aerokit Sea Scout 'Jessica' Renovation Print Booklet
Author: RNinMunich   Posts: 6   Photos: 32   Subscribers: 1   Views: 656   Responses: 84   |   Most recent posts shown first   (Show oldest first)

mdlbt.com/28881
Taycol Test 2 with reverse :-)) - Posted: 15th May 2017
Success 😊 First attempt as per cct with + &- from bridge connected to field --> Zilch 🤔
With + & - outputs connected to brushes and the two ~ to the field coil --> perfect, Full power F and R 😊 Confirmed my suspicions!
Pic 1 shows the breadboard lash-up.
Pic 2 input waveform to brushes forward power, average 'DC' positive.
Pic 3 input with reverse power, average 'DC' negative.
Pic 4 typical current drawn near full power @ 6V. Well within Taycol spec.
Pic 5 shows the waveform with the motor in standard 'out of the box' setup, complete with sparks! Have also videoed the change in waveform with 'stick' movement.
😊 I'm happy with that. Will now tidy up the layout and make a compact board for boat installation. Tomorrow is another day 😉 Cheers all 😎

Attached Photos - Click To View Large

Response by Dave M on the 15th May 2017
Glad you got it working. The secret is to change the polarity to just one set of coils otherwise you reverse both magnetic fields. The bridge rectifier achieves this.
Current draw is as you say well within spec.
Pic 5 says it all really. Those spikes are nearly full voltage and will defo be a problem for any ESC that doesn't have fast protection diodes.
They are acting as spark transmitters and explain why early TV sets were so vulnerable to interference.
Modern Rx are much more sensitive and ESC's will react to this high pulse, so it is not surprising they suffer from interference if no suppression is in place
Hope you do an update when you have completed the wiring
Dave
Response by RNinMunich on the 15th May 2017
Yep! I remember the snow and prancing round the room with loop antennas trying to get a half decent picture!
Marconi transatlantic tests!!

Will update as appropriate. Missing the ozone scent 🤔 Oh well, you can't have everything I suppose.
Cheers Doug 😎
PS the 'secret' was clear!

mdlbt.com/28877
Taycol First test with ESC. - Posted: 14th May 2017
Taycol Target test 1, with Graupner V30R brushed ESC. Running on 6V.
As expected full speed control with ESC connected to field terminals as usual but no reverse. Now about to try the 'lecktrickery'. More soon. 😎
Response by RNinMunich on the 15th May 2017
PS to Taycol Target / ESC tests: Interesting side effect! The sparks have gone 😊 Sorry Dave 🤔
Presumably they are damped by the diodes. The 800Hz switching frequency, as opposed to constant DC, may also play a role.
"Veeery interestink, but don't forget to tell Lucy!!". Showing my age again!
Cheers Doug. 😎
BTW copying expressly desired!
Response by Dave M on the 15th May 2017
Hi Doug
The sparks are being controlled by the diodes as you suspected and as shown on the skope. The frequency will be a factor. I suspect you can probably hear the tone through the coils, depending on your hearing.
Last I heard Lucy was still up there with the sparklers!
Be interesting to see more skope pics once you have tidied up the wiring.
Dave
Response by RNinMunich on the 15th May 2017
Yep, I can hear the tone, now the motor growls!

Not the Beatles Lucy! I meant the little guy with the German helmet who always appeared at the end of the Rowan & Martin Laugh-In on Saturday nights! Many many moons ago 🤔
Cheers Doug 😎

mdlbt.com/28727
Taycol Pt 3. New Brushes Pt1 - Posted: 12th May 2017
1) Carefully flattened first old brush with flat jaw pliers and traced it and stick-glued to the fozzy sheet,
2) Raw cut of blank. I use tin snips with fine serrations on one blade.
stops the snips skidding and minimises curling 😉
3) First raw blank next to original after careful flattening with tack hammer and anvil and removing minor twist. For the next one I think I'll drill it in stage 1 🤔
😎

Attached Photos - Click To View Large

Response by RNinMunich on the 13th May 2017
Yep, or 5.6mm! My micro is metric! Checked the thread as well ~ 3.2mm or 0.126" 👍 Hmm, just started peeing down - again 😆
So, onward and upward, will start on he actual boat after lunch. Ciao for now 😎 Many thanks all for the offers of help with the nuts😊
Response by Westquay on the 13th May 2017
Excellent. So now it's all up and running.
That was a quick restoration too.

Martin
Response by RNinMunich on the 13th May 2017
Sometimes (often!) takes me a while to get started, but then -
Don't get in the way!
Since working outside (sanding etc) has just been nixed by the weather think I'll start on the reversing circuit. Cheers Doug 😎

mdlbt.com/28434
Target Renovation Part 2 - Posted: 9th May 2017
Hurrah for the Cyber Shot ! Here are the missing pics 6 & 7 of the 'nail polishing boards' from last post!
So, last night I used this board to clean up the rest of the parts. Results in
pic 8. The bitza bazaar!😊
Back to the brushes 🤔 Caught them just in time before they fractured and started chewing up the commutator! Pic 9.
They are simple phosphor bronze strips with a dimple pressed in the end for the contact.
The crest of the dimple (the actual contact area) is burned / worn away but the rims are intact so, until I can get some phosphor bronze strip I will make a temporary repair by soldering a tiny piece of thick copper wire under the hole and polishing it to shape. Wish me luck 👍😎

Attached Photos - Click To View Large

Response by RNinMunich on the 10th May 2017
Noggin the Nog ?? 😁
Response by Scratchbuilder on the 12th May 2017
Hi.
I had the same problem a couple of years ago with my Taycol Target.I removed the Existing brushes, flattened the worn segment ends and soldered new carbon handmade sections onto the old brass brushes.They have worked fine to this day.NOT original I know but effective.
Bill.
Response by RNinMunich on the 12th May 2017
Caaarbon!! Aih Say Sir, Gadzooks! 😉
See Part 3; I just made new phosphor bronze brushes, about to reassemble and test! 😎

mdlbt.com/28432
The Taycol Target Renovation - Posted: 9th May 2017
Progress 😉
Dismantled and armature / field coils separated to inspect the damge-
Pic 1: 'Les Bits' or Oh gawd! How am I ever goin' to get this back together?

Pics 2 & 3: It's actually in better nick than I expected 😊 Didn't get much use as I recall.
Commutator is meatier than I expected pic 3, brushes not so good, pic 2. More to that later!
Pic 4: Cleaning up the commutator on 'the lathe'! Good enough for this job, not worth starting up the Proxon. The stand is an ancient Black & Decker accessory, the drill is an also ancient Buffalo. Think it was an AA special offer when I still lived in UK about 35 years ago. Automobile Association not what you were thinking😉
Pic 5: Commutator cleaned up a bit. Can heartily recommend the ladies nail polishing boards for this sort of job. See pic 6 & 7 . NOT nail files, they're much too coarse. The boards are a handy size for our big mitts come in packs for peanuts and have three 'grits': fine, super fine and ultra super fine👍 So I started with a nearly knackered piece of 600 wet&dry and finished off with the board.
Damn! Samsung Stupidphone won't connect to the PC😡 have to go and dig out a real camera, more soon 😎

Attached Photos - Click To View Large

Response by RNinMunich on the 10th May 2017
Yep, inside the box is a little 'Caviar' 😉 glass for the remaining nuts, screws and washers! 😎
Response by Westquay on the 10th May 2017
We had started throwing the Chinese pots away again as I was getting too big a pile, but tonight's meal came in an extra deep one, so they will be looked for in future. Something like a Mini won't fit in a normal one.

Martin
Response by RNinMunich on the 10th May 2017
Great Minds👍 Guten Appetit
I'm making some fish n chips 😜
😎

mdlbt.com/28210
Aerokit Sea Scout 'Jessica' Renovation - Posted: 6th May 2017
Some of you may already know part of the story but, spurred on by Martin 'Westquay' and commanded 😉 by Admiral 'Dave' here goes 😎
Dad built her originally when I was about 12, so ca 53-54 years ago.
She was 'No name' and free running with a Taycol Target, ahead only, and a 6V (very) wet cell lead acid. (Down to the garage again for a 'top up!)

Anyway, to cut a long story slightly sideways 😉
MY daughter Jessica found the boat in the cellar when she was about 12!
And immediately wanted to run it on the local lake in Munich, as I was doing with my HMS Hotspur (but that's another shaggy model story!).
Sooooooo, she was cleaned up, resprayed pink (😡!) and white, Taycol Target field motor (no reverse) removed and replaced with a Decaperm 6V 7A with 2.75:1 gearbox. 6V 4000mAH SLA (weight half ton or so) Performance was rather sedate. Well it seemed like a good idea at the time!
RX, battery and rudder servo were shoehorned into the aft compartment, Jessica nameplates stuck on and off we went. Jessie was happy with the boat and I was happy with the Biergarten. Can't remember where 'the management' was 😉

Jessie soon lost interest so I used the boat as a test bed for a while.
So now, 25-26 years on; prompted by Martin, I took the old lady down off the shelf /I TOLD her not climb up there!😉) and started inspecting the damage. Photos attached. (Yes I know 35Megs is not for boats but I didn have nowt else then🤐) The ancient DIN Audio socket was for charging the RX bat, double throw switch on starboard quarter. The big 'ole was for the telescopic antenna borrowed from an old radio. Needs must when ...
The funny looking 'thing' hanging out the transom is a dummy exhaust hiding the bolt holding the antenna bracket inside!

Have also started dismantling and renovating the Taycol, which I want to put back in with a reversing circuit and a 2S or maybe 4S LiPo. That was day before yesterday. Yesterday I took out the junk (siren, water pump, servos & micro switches to operate them and the running lights) and wiped the dust off - last two photos, incl. THE JUNK.
Stripped of all the junk & Decaperm she weighs 1214gm (about 2lb 11oz).

Also tested (cautiously!) the Taycol with a regulated / current limiting PSU. She rattled and protested but ran 😊 Now being dismantled, cleaned up and brush gear refurbished. Might also fit proper bearings!
Next step: clean up the old gal, check for leaks and load capacity.
I will probably use the 4S LiPo ca 310gm, the SLA was 660gm, so lots of spare capacity, or maybe I can get her nose out of the water for once
More soon Cheers from Munich 😎
PS to DAve and Martin: NO! I don't propose to go full authentic nostalgia with a wet cell accu 😉

Attached Photos - Click To View Large

Response by RNinMunich on the 9th May 2017
Hi, do you have a pic of a 'Huntsman' so I can see if your vison coincides with mine? Thanks. 😎
Response by Westquay on the 10th May 2017
Here's one, Doug. Nice, innit?
https://model-boats.com/media/np/s/200/1494408214

Especially with the gold cove line. One could almost see old Prinny Phil at the helm, eh, what?

Martin
Response by RNinMunich on the 10th May 2017
Mmmm nice! Yep something like that is what I had in mind. But first the Taycol Target. The bits an bobs should be here tomorrow, then 'Los geht's'!
😎