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Search: Posts Made By: jirvin
Showing results 1 to 25 of 29
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10-25-2010, 08:07 PM
Replies: 8
Views: 3,697
Posted By jirvin

RE: spyder foam

Hi Just a FYI

I received good service from Clarasonic in Thailand

240mm by 800mm 1mm sheet R51 rohacell (got 150)  ended up around $6.00 AUD  similar USD pricing...
04-08-2010, 07:19 PM
Replies: 2
Views: 3,148
Posted By jirvin

RE: Looking for a super hard , brittle epoxy ?

I use epoxy for fiberglass fuz and molded model construction.
http://www.rcgroups.com/forums/showthread.php?t=1139397
http://www.rcgroups.com/forums/showthread.php?t=765337

No experience...
11-10-2009, 10:15 PM
Replies: 9
Views: 1,740
Posted By jirvin

RE: foaming agent

I am experimenting with gassing additive to epoxy for joining wing shells.

I obtained my accelerant from the local ceiba geigy agent - I think it is an Araldite product.

RG list it in...
06-22-2009, 10:14 PM
Replies: 23
Views: 2,142
Posted By jirvin

RE: Epoxy Advice Needed

Need to clarify which tube is failing..

Are you making the main load carrying tube (wing joiner)
 or the carry tube that is in the wing which the load carrying tube is inserted into?

I assume...
Forum: Q-500 Racing
02-22-2009, 12:58 AM
Replies: 53
Views: 6,062
Posted By jirvin

RE: Reintroduction of the Smasher

No longer racing myself but very much into composite construction.

Spends lots of time trolling in this forum as it is probably the most active for home composite builds

This link shows F5b...
02-16-2009, 08:45 AM
Replies: 4
Views: 1,082
Posted By jirvin

RE: Voids in the seam of a fiberglass fuse..

Can you take us through you technique and maybe we can identify what is going wrong.

I paint in the mold and do wet seam joins.
I do this by leaving out the last layer of cloth until the...
10-18-2008, 01:27 AM
Replies: 5
Views: 2,280
Posted By jirvin

RE: "Sparky" vintage R/C electric project

Wow - I know the Sparky:D

My first rc plane I saw fly was my dads Sparky.

I was 4 years old - now 52!

I keep getting keen to build one - I have the water damaged original plans with...
10-15-2008, 06:39 AM
Replies: 23
Views: 3,887
Posted By jirvin

RE: Plug/Parting board

I use bondo or epoxy and micro balloons.
I over fill the slot and then remove the plug after it has hardened and then sand the bondo flat

To ease removal of the plug the splitter boards are...
01-19-2008, 07:41 AM
Replies: 4
Views: 909
Posted By jirvin

RE: Sand

Hi ed,
I think there is a very long thread on sand as backfill in mold contruction in the beginning of this forum

cheers Jeff

ps quick search of this forum using "sand" and "mold"

...
12-07-2007, 05:37 PM
Replies: 26
Views: 5,767
Posted By jirvin

RE: My vacuum bag layup has crinkles, any advice?

I have put hthe layers in like David (most sucessful method) plus another method -wet all the layers up as a group on the bench and put them into the mold as a wet mass (only on small molds). The...
12-07-2007, 05:28 PM
Replies: 26
Views: 5,767
Posted By jirvin

RE: My vacuum bag layup has crinkles, any advice?

One other trick.

Massaging the layup- I squeegee the plastic vag bag film during and after the vacuum is pulled. In the larger areas I use a plastic squeegee (apply talc to the plastic to make...
12-07-2007, 05:17 PM
Replies: 26
Views: 5,767
Posted By jirvin

RE: My vacuum bag layup has crinkles, any advice?

I have had similar results - wrinkles and ridges with plastic release. Like David said comes with the teritoy.

I recently tried home made plastic breather (wanted more flexible/stretchy...
04-28-2007, 12:16 AM
Replies: 26
Views: 7,143
Posted By jirvin

RE: Reproduction of Curare Fuse Project Thread

I would worry about spliting the fuz to put onto boards. The distortion may be difficult to manage. May be better to use splitter board?

For a project like this I often make a very quick splash...
07-01-2006, 08:17 PM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Hi Rob
I wonder is this C7 you are suggesting to be "470nF/400VAC / 600VDC" it looks more like C1?

I have used greecap/mylar type for C7 0.1u as per circuit diagram - is it correct to change...
06-30-2006, 11:40 AM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Thankyou Rob

>0.1 uF is a littlebit low, use 470nF/400VAC / 600VDC atleast
0.1 shown on circuit diagram will try larger value- off to the shops in the morning!


>5 Volt is (to)...
06-30-2006, 09:59 AM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

I have spark- ouch!



All very messy at the moment:eek:

Operating at this stage without scr by earthing the capacitor C6 to earth to generate spark.

Using 4 cell nicad (5.2v) - I...
06-25-2006, 09:02 PM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Yes a lot of talk about electronics.
It is an open source project where this talk helps develop the goal to a DIY CDI for engines.

I take it on faith that it works.

The original thread...
06-25-2006, 08:03 PM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Hello Rob
On the schematic the capacitors c3,c7 are listed as 0.1u (100n) + (electro type?)

These have been difficult to find - must be looking for the incorrect thing?

Could these be...
06-25-2006, 10:25 AM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Thanks Rob
Sleep soon- now 1.30am - home with a brocken arm plenty of time off[:o]
(fell of my nice BMW bike)

Last for today
I find cheap JDM programmers on Ebay - will research later.
...
06-25-2006, 09:45 AM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Thanks again Rob
Im getting closer:D

Capacitor for storage C6 is what we call
Greencap, Polyester or"Mylar"
I have found 630v dc 470nf 26mm lead spacing ?


L4 1uH is this a RF...
06-25-2006, 08:46 AM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Thankyou Rob

I have spent day going around in circles looking at available online Australian electronic shops

I find to my embarrasment that the final hall was originally listed on the...
06-25-2006, 07:25 AM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Hello Rob
I feel more informed in my searching for the hall unipolar type

Also available locally is this

IC, sensor, Hall Effect, unipolar, SS443A
Details from data sheet

Am I...
06-24-2006, 11:02 PM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

re suitable hall switch
Am I looking for the correct type of hall switch?

I think I may be closer with this
UGN3177UA
http://www.ortodoxism.ro/datasheets/allegromicrosystems/3175.pdf

...
06-24-2006, 09:19 PM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Thankyou Rob for the reply on the E-Core - I will buy the fluro p/s and use the rewound transformer.

I am now researching locally (Australia) available hall switch.

From my reading to...
06-24-2006, 06:48 PM
Replies: 1,447
Views: 256,784
Posted By jirvin

RE: New CDI - opensource project JMJ and Bigboat

Re Suitable hall effect sensor
New to electronics - understand the basics!

I have seen mention of this Hall Sensor in the thread:-
"Also I want to use the H501 Hall switch (Unipolar type)...
Showing results 1 to 25 of 29
 


 
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