Instrument tubing

On Wednesday, August 7, 2019 at 8:12:19 AM UTC-7, soaringjac wrote:
Where does one get those "doughnuts" that you put over instrument tubing to help secure and seal the connection?

Don't waste your time using those they are not needed.

Richard

Exactly. Tubing should be silicone. No additional devices needed.

On Wednesday, August 7, 2019 at 9:27:34 AM UTC-7, Tango Whisky wrote:
Exactly. Tubing should be silicone. No additional devices needed.

I plan on using the colored tubing from Wings and Wheels. Good stuff?

Absolutely, very good tubing!

On Wednesday, August 7, 2019 at 12:46:40 PM UTC-7, soaringjac wrote:
On Wednesday, August 7, 2019 at 9:27:34 AM UTC-7, Tango Whisky wrote:
Exactly. Tubing should be silicone. No additional devices needed.

I plan on using the colored tubing from Wings and Wheels. Good stuff?

Craggy Aero also has tubing

http://www.craggyaero.com/tubing_&_fittings.htm

Richard
www.craggyaero.com

I use silicon tube of 5mm ID cut into 10mm pices and stretched over the tube and fitting.
The rubber donuts deteriorate very quickly to the point of being useless.

The rubber rings are called docking rings.

That's what I used.
https://drive.google.com/file/d/1Kg5...w?usp=drivesdk

On Wednesday, 7 August 2019 18:27:34 UTC+2, Tango Whisky wrote:
Exactly. Tubing should be silicone. No additional devices needed.

I can't agree more. Silicone tubing will practically last the rest of your lifetime, it never leaks and it reseals when removed and reconnected.

I used "food grade", thick walled, silicone tubing sourced from China due to the low price (around $50 for 12 meters) and free shipping. Red for pitot, blue for static, black for T/E.

PVC tubing is for fish tanks.

On Thursday, August 8, 2019 at 10:34:23 AM UTC+1, Surge wrote:
On Wednesday, 7 August 2019 18:27:34 UTC+2, Tango Whisky wrote:
Exactly. Tubing should be silicone. No additional devices needed.

I can't agree more. Silicone tubing will practically last the rest of your lifetime, it never leaks and it reseals when removed and reconnected.

I used "food grade", thick walled, silicone tubing sourced from China due to the low price (around $50 for 12 meters) and free shipping. Red for pitot, blue for static, black for T/E.

PVC tubing is for fish tanks.

Behind the panel soft silicone tubing needs a lot more care on installation to ensure that it is fully supported otherwise it moves around in turbulence and when pulling G and that can cause pressure change to the vario. PVC tubing also needs care in that respect but less so. I never use silicone tubing or donuts or tie wire and have never had a leak at the instrument. I take care to make sure that T pieces etc are free of flashing - metal ones are better. The only downside of good PVC tubing is that a 90 degree bend that looks OK on installation can go flat over the years and cause a blockage so I always use 90 degree corner joining pieces instead.