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>> Home > Boat Building Blogs > Krick Police Launch
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mdlbt.com/42133
Krick Police Launch Print Booklet
Author: MouldBuilder   Posts: 2   Photos: 15   Subscribers: 1   Views: 495   Responses: 18   |   Most recent posts shown first   (Show oldest first)

mdlbt.com/42583
Seeing the light - Posted: 10th Jun 2018
It has been a busy time at work which means that I have very limited time to build at the moment. All things considered all is going well.
I have started the superstructure. The components are requiring a lot of additional work to fit them. I am glad about this as it is all good experience. My sandpaper and files are glowing due to over use.
I have found a very useful filler at my local model shop made by Red Devil. It is extremely light and sets in a very short time; ten minutes. It says that it can be painted after ten minutes. Don`t think I will test this.
I have fitted the deck and sanded down the hull sides to match. I think the weather is almost good enough to start the painting. I am still a little concerned about this particularly with the use of masking tape. I am worried that the previous layers which are covered by the tape will peel on removal. Can anybody tell me how long to allow paint to dry before applying tape and how long can the tape stay in place. I am using Tamiya tape.
I have decided to illuminate most of the lights and will make a module for flashing the blue light. I have lots of electronic components here as I enjoy making prototype circuits. Unfortunately, my love of making these boards is not matched with a knowledge of exactly how they work so I am sure I will be asking for help with the circuit diagram. I have all the components here.🤓
Well that all for now. I am currently constructing all of the deck items. This I find more difficult due to the manipulation of very small parts having `sausage fingers`. Must buy more tweezers!!😊

Attached Photos - Click To View Large

Response by RNinMunich on the 22nd Jun 2018
Bon chance mon ami👍
Response by MouldBuilder on the 22nd Jun 2018
Evening Doug.
I have made up a couple of circuits. They both work well. I have fitted the variable resistor to your design and it works really well.
The circuit components are as follows. R1=200k variable. R2= 4k7 resistor. Chip= 7555 CMOS. Capacitor after R2=10uf. Capacitor at pin 5 = 10uf. Single blue LED is 20mA with a 180r resistor. Battery voltage 6V.
I have some strange results. The variable resistor works well but strangely, if I disconnect the capacitor at pin five, there is no effect to the flashing light at all. It still works well. There is also no effect if I increase or decrease the value.
I am happy with the results but would like to increase the on time a little. Please can you tell me which component should be altered and whether the value rises or falls.
Thanks for your help.😉
Response by RNinMunich on the 23rd Jun 2018
Hi Peter, Glad it works at all! 😊
1. the capacitor on pin 5 has no effect on the timing circuit.
It's only there to stabilise the 555 chip and stop it 'going off it's trolley' at higher frequencies 😉 It should be 10nano Farad, not micro Farad.
It's job is to short any stray high frequencies to ground.
2. Attached is a table of results I would expect for the values you gave me, and various values of the pot R1.
The duty cycle (%age On time) should vary between 50% and 95%.
Max on time 1.4sec at R1 = 200K. But Off time of 32mSec you'll hardly notice.🤔
3. R2 is way too small at 4.7k compared to the 200k pot.
I warned you that it needed to be similar to the pot to make the adjustment less sensitive. The low value is also the reason why the Off time (discharge time) is so short at 32.62mSec 😲
4. The timing cct is governed by R1, R2 and C.
Pic 2 shows the output waveform switched between Vcc 6V and 0V-
Increase C to increase the whole period (T1+T0) (reduce the frequency).
Increase R1 to increase High Time (T1), without affecting the Low Time (T0).
Increase R2 to increase High Time (T1), increase Low Time (T0) and decrease the duty cycle.
5. Your 180Ohm resistor is about right for an LED with 2.5V Forward voltage drop and 20mA current. If the LED actually wants 30mA you can go down to a120Ohm.

So, how much is 'increase the on time a little'?
What cycle frequency do you want? How long On and how long Off?
Since you are 'Breadboarding' you could just try plugging in different fixed resistors for R1 (instead of the fiddly pot) and R2.
Pic 3 shows results for R1 = 47k and R2 = 100k, C = 10uF.
About 1Sec ON, 0.7Sec Off.
Cheers, Doug 😎

mdlbt.com/42134
Krick Police Launch - Posted: 26th May 2018
I have just started to build the Police Launch that I have had for a while. Work commitments have left me with little time lately but hopefully I can get a good run on this one for a while. I hope to finish it by late July which just leaves me enough time to send it to Hungary so that I can test it.
The kit is said to be good for a beginner. This would be good as many years ago I built a Patrol Torpedo Boat which took me five years. I am currently restoring this one as well but I think that will take most of this year to complete.😁
I have started by buying the speed controller. The motor is a 400 brushed. Probably not going to be too difficult to keep up with this one.
The kit itself is not too bad considering the price, but I do feel that the ABS vacuum formed hull could be of a slightly better quality. Also I am finding the ply wood to be rather brittle. Does anybody have an idea for a good filler to use to fill the chips which will take to acrylic paint.
I have prepared the hull and added the propeller shaft and rudder holes. Care taken here to avoid splits in the plastic. Cellotape on both sides before drilling helps.🤓
I have assembled the internal parts which hold the motor, battery and rudder and also fitted the prop shaft.😲
I will start on the deck and superstructure next.
An additional note about the kit. The instructions are reasonable but they are in black and white which is not helpful considering they are photograph based with text. I found a PDF on the web which is in full colour. Why don`t Krick supply this. Surely not that expensive.🤔

Attached Photos - Click To View Large