RE: New CDI - opensource project JMJ and Bigboat
 

Thanks, Bigboat, you da man. I'll try it out once I'll find out what a wireresistor is. I'll try a search about it.
I saw somewhere a simple plan for a programmer for the chip. I thought it was on your site but I may be wrong and that it was on the other CDI forum. I'll have to go through it again.

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

Wired resistors are a littlebitt bigger as carbon resisors and you can see the wire around the resistor.
Programmer can be found here http://osaka.cool.ne.jp/feng3/en/rcd.html

RE: New CDI - opensource project JMJ and Bigboat
 

Thanks, Bigboat. BTW, I thought that the ferrite ring is like a transformer and now you thought that I was talking about it when I said choke. Is it not a transformer of sort? And if yes, is it not more important the number of windings and the relation between them rather then the length of the wire as was said on the other thread?

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

English isn't my first language and sometimes I don't know wat people mean.
I'm a *selfmademan* to english, I don't get it on school at the time......35 years ago.
With the internet, english is the language you have to know if you want to know more.[8D]

Only the spark will be differend, wind differend kind of winds.
We wind a lot of transformers, but every transformer will work.
The transformer isn't critical, only the direction of all winds must be the same.

We have to write a *howto* for both cdi, but it takes time.....very much time, to write a good howto.
JMJ and I have more intrests, flying and boating, and those hobby's takes also a lot of time.
In winter we build our planes and boats to hope to be ready befor summer and in the summer we are outside with our models.....not behinde the computer to write howto's.
But most of the builders of the cdi know how to build this electronic and otherwise......they can allways email ;)

RE: New CDI - opensource project JMJ and Bigboat
 

First let me tell you that your English is excellent. I wish I could speak Dutch like you speak English, so don't be ashamed.

I asked that question because I wanted to use a smaller ferrite ring but I lost my confidence when I read that the length of the wire is important. What I understand from you now is that I could use a different ring and if the number of windings are the same the spark maybe smaller? Then it is the length of the wire that is important, correct? I could use a smaller ring and will have to increase the number of windings.

Yoram

BTW, it's bragging time. English is my third language. German the second. It's Hebrew that is the first but people in the know could tell by my name.

RE: New CDI - opensource project JMJ and Bigboat
 

I'm glad you have the same problems with english like I do :)

The winds and the rpm of the engine (number of sparks) and the capacitor and the intention of the spark are all connected to each other.
If you use less winds, the spark will be smaller.
If you use less winds, the capacitor must be smaller
If you use less winds, the rpm will be lower
BUT
The winds of the ocsilator are also important.
Less winds at this side will mean less rpm, more current and longer loadtime to the capacitor.

You need Joules (about 40 mJ) to load the capcitor at 8000 rpm....somewhere in this treath or *opensource cdi* I have make a calculation.

RE: New CDI - opensource project JMJ and Bigboat
 

That is my point, my friend. It is the number of windings. In the thread that you've mentioned it was said that the length of the wire is important. Here you mentioned only the number of windings. So my question still stands. If I use a smaller ring but the same amount of windings will I still have a strong spark or would I have to make more windings in keeps of the 'same wire length theory'?

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

You have to make more winds, at both sides, if your using a smaller ferritring.
Only the behaviour of the coil will be the same with the same winds, but the spark will be less strong.
I can't tell you exact wat you have to do, there is no standard rule becourse all componets are differend you (and I) use.
Not all ferrits are the same, not all wires are the same, not the way you wind you coil is the same like we have done.
But all coils will work and you have to find out by your self wat kind of coil you need for your application.
If you can see on www.modelbouw.gompy.net/cdi/cdi.htm I make a few coils for this cdi and all will work fine.
On the Stihl a small coil will do the job, but on my Zonoah it doesn't work....not enough power for the high rpm this engine makes.
A big sparkcandle use more power then a small one and also the compression of your engine is important.
If you have a high compression, you need more power for the spark.
If you use a big bobine, you need more power from the capacitor, so you have to load the capacitor with a higher Voltage from the coil = more primair winds >400.
I don't hope you put the cdi away right now, you will see he works fine, but it's a hobbyproject and maybe you have to wind a few coils.....sorry.

RE: New CDI - opensource project JMJ and Bigboat
 

Don't worry, Rob, I'm not about to give it up. I did one many years ago from an article in RCM magazine and it worked fine on a Saito 120. I did the winding on the bobine then and I'll do it now. I only feel like doing it once if it is possible. :-) I will now do two boards for two Quadra 35 that I have and maybe a new one for the Saito and for sure the timing board for all of them. I can see that I might run into some problem with the excel sheet but I'll cross that bridge when I'll get there. Right now I'm in the process of ordering the stuff in the States so that a friend can bring it on the 11th of January. I have lots of time here on my Caribbean island. It's every day vacation and almost every day flying, or in your case boating, weather. :-)

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

WOW, I think I have to move to the Caribbean too.......nice way to live [8D]
Do you use the our Exelsheet or the one from http://www.transmic.net/gbindex.htm ?
The one from the last site didn't work, there are some failer in it.....HEX2DEC isn't comatible
We use a normal Exelsheet, no plugins needed.
In Holland it's now 0 C, eastern wind (from Russia) and some rain.......not the boatingweather I like [&o]
Now I building a new (Zodiac) boat, www.modelbouw.gompy.net/zodiac
It's from PVC-tube and rubberfoil with a 33cc modify Homelite watercooling but I have still to put my CDI on it.
The Stihl-engine runs like hell with this cdi, almost 1000 rpm's more as normal.

RE: New CDI - opensource project JMJ and Bigboat
 

Well, we had here today only 28c. Kind of cold, coming to think of it. :-)
I'm building a plane from coroplast. Look up SPAD in google. It's a cheap way to build airplanes. No balsa. I'm going to put the Quadra in it and that's why I need the CDI. I've stripped the magneto a long time ago from it in preparation for the CDI and now it's time to make it.

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

BTW, you have to fit the hallsensor about 40 degrees beforo TDC.
Into the Exelsheet you can manipulate the curve as you like.

Isn't coroplast to fragile to build a 30cc (?) plane ?
They use it also for 3d and indoor planes ?

RE: New CDI - opensource project JMJ and Bigboat
 

Pffff......almost 2 o'clock at night......I have to go to my bed.
I'm free from work, but I need my 8 hours sleep......say the old man :D

RE: New CDI - opensource project JMJ and Bigboat
 

I will do that. That's the easiest part. :-)

If you use the 4mm stuff it is not. For indoor and 3D they use mostly 2mm.

RE: New CDI - opensource project JMJ and Bigboat
 

I'm not a big boat fan but I like the use of resources that you implemented. Just like me using the coroplast. Most impressed, however, I'm with your lathe. That's quite a machine to have in your basement. I'm blue with envy. Is the header on the right rather then the traditional left or do you have to go to the other side to use it?

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

I use this machine to confert my engines, he have complete automatic feed to the left/right/forward and back.
I can also make nuts and bolds with this machine, bet the header on the right don't turns, it's to drill.
He weights 130 kilo and it was a hell of a job to get him downstairs without drop him.

http://www.modelbouw.gompy.net/zodiac/hpim0180.jpg

RE: New CDI - opensource project JMJ and Bigboat
 

Bigboat: Where did you buy that nice looking Lahte? Sounds like 286 LBS!! That is a heavy built little Lathe. I like the bellows it has on leadscrew to keep chips out. Ceck out our thread on Lathes and feel free to show us some tips. Thanks Capt,n

RE: New CDI - opensource project JMJ and Bigboat
 

[link=http://www.buitelaar.nl/comasy/templates/product.aspx?contentid=237&productid=646]Herman Buitelaaar into the Netherlands[/link]

RE: New CDI - opensource project JMJ and Bigboat
 

Bigboat: Can you give me a direct link to the Lathe you have? I cannot read ...only english!!! Capt,n

RE: New CDI - opensource project JMJ and Bigboat
 

Sorry, but it's a Dutch-company and as far I know, they sell only into the Netherlands.

RE: New CDI - opensource project JMJ and Bigboat
 

That is definitely a professional machine and has the price of it too. At 1000 Euro, tax included it comes to about $1,300 which is out of most hobbyist budget.

You could ask the manufacturer for a discount as he says on his website. ;)

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

Pilot Tiger: You are right about the price. Kind rich for my blood!! If you can post a Photo of where you fly RC Down there. I bet you fly float planes too....lucky guys!!! Capt,n

RE: New CDI - opensource project JMJ and Bigboat
 

No float plane here, Capt'n. The next lake is 5hr away and from the beach, 1.5 min away, I wouldn't dare. It's good for body surf but not for floating toys. Not my toys anyway.:D

I don't have a flying field. I fly from where ever I can. Mostly from the baseball field nearby with takeoffs right over the houses and landings between the palms. I'm still looking to get me a piece of land to make a flying field. I'm the only guy here who is into it. Most, if not all, of the locals can't afford it and none of the gringos that I know are not into this. They made a road for a subdivision right next to me. I'll go there and try it out for a while.

Yoram

RE: New CDI - opensource project JMJ and Bigboat
 

Pilotiger:Have you seen our flying field in Santo Domingo,check it out on google earth 18deg 38'14"and 69deg56'37".More or less 50 active pilots.Flying usually on sat and sundays.Where are you located?,I am in Santo Domingo.

Waldo

RE: New CDI - opensource project JMJ and Bigboat
 

Mangolo, I live in Cabarete, Sosua. Puerto Plata. Driving to Santo Domingo to fly is not an option. It's 3 hours or more drive. [:o] Anything over 30min drive is out of my car's fuel tank range. :D (And my patience too):D

I still have fuel to last me for a while but once I run out I'll have to go to San. Dom. to buy new since the store in Santiago closed and now there is only one store in the country. That's why I try to convert all the big engines to gas. (2 Saito 120 and 2 Quadra 35)

I get most of my stuff from the states. I have friends that come and go. I order the stuff on the net and have it delivered to them and they bring it to me. The only problem with that is that I have to wait about two month every time for it to arrive.[&o]

Do you know where I can get some Epoxy? Not the 5min stuff, the one you can make fuselage out of. I need about a quart. There is a place in Santiago that is selling it but I have to buy a 5gal bucket.

Yoram