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Member postings for cymaz

Here is a list of all the postings cymaz has made in our forums. Click on a thread name to jump to the thread.

Thread: Spring is here. Who is flying?
20/04/2019 21:39:41

Finally a great day at the field at St Austell DMC. Warm sunshine, light winds, came last in a flying competition blush

Went home with all my models intact yes

Hope to do it all again tomorrow at Davidstow.....except no competition Sunday thank goodness 

Edited By cymaz on 20/04/2019 21:41:23

Thread: Loss of trim due to moisture and temperature.
20/04/2019 17:51:48

You could rename the Majestic Major.....................Rising Damp sad

did you put any holes in the rudder??

Edited By cymaz on 20/04/2019 17:56:23

Thread: Pressure Equalization on petrol engines
20/04/2019 17:41:30

My Mr Mulligan went immediately rich and rough on its first flight....radial cowl !

Thread: Zenoah 38 conundrum
19/04/2019 22:21:43

Doing some reading for another thread


Martin, if you think it’s carb related, have you seen this? Explains everything about the Walbro

Edited By cymaz on 19/04/2019 22:22:25

Thread: Pressure Equalization on petrol engines
19/04/2019 21:58:09

The diaphragm under the plate is acting the fuel metering lever. The the air hole is needed for atmospheric reasons, a Vacuum is on the fuel side so atmospheric pressure is needed to move the diaphragm. However, if the air pressure is disturbed in any way the diaphragm will move with this change, this in turn changes the metering needle causing poor running. Modification of the cover plate is easy...the other end of the tube should be put in the fuselage away from any fast moving air.


An excellent explanation with great pictures is HERE

HERE is how to make it, I didn’t use the film can though, just put it in the fuselage 

Edited By cymaz on 19/04/2019 22:05:19

Thread: Infinity 90 Build
19/04/2019 20:42:07

I’ve done the edges with far so good

Thread: What birthday present do you give your 25 yr old son
19/04/2019 18:19:45

She’s at it again !! Mrs C, I mean.

No.1 daughter was 26 on Thursday. Got a thing for rabbits ( she has two of her own )




Edited By cymaz on 19/04/2019 18:22:45

Thread: Infinity 90 Build
17/04/2019 05:28:24


Thats what I would of done as I mentioned in my post. In my defence, it was late, busy day at work as well, and I was ready to hit the sack.

16/04/2019 20:53:10

Quickly done a couple of photos. If I had time I’d have put the wing on and got the correct starting incidence from there. So, here is the tail set at 0*


And here is the angle showing on the back of the spinner at 0* at the tail. The photo is 90 degrees out

Hope this has helped somewhat. Sorry it was a bit rushed. I guess that’s 2.4* down thrust 



Edited By cymaz on 16/04/2019 20:54:21

Edited By cymaz on 16/04/2019 20:55:00

16/04/2019 19:20:33

Test flew it after work today. The extra down thrust had made a world of difference. Much less pitch sensitive. Aileron rates cut down and a tad more expo added. More rudder throw as well.

Edited By cymaz on 16/04/2019 19:21:31

Thread: Zenoah 38 conundrum
15/04/2019 22:59:17

Has to be some dirt the one of the carb galleries. Leaking bearings, letting air out , reducing the pulse to carb

15/04/2019 22:53:10

The only thing not mentioned was battery and switches. It reads that you have been methodical and thorough. So, I wonder if these have been inspected and checked?

Are you using the magneto version or CDI. I had a problem with inconsistent running and found it was the opto isolator switch playing up.

Edited By cymaz on 15/04/2019 22:53:38

Edited By cymaz on 15/04/2019 22:56:22

Thread: Swept wing Bipe, C of G?
15/04/2019 17:10:16

THIS might help

Thread: Building Brian Taylors Cessna 120
14/04/2019 16:11:30

Cracking pilot Grommit dog

Thread: Infinity 90 Build
14/04/2019 11:54:00

After 2 hours of work, ( it’s a long boring story) finally got 0.9* of extra down thrust. Just have to fly it now....if the trees stop bending sideways in the howling gale.

Edited By cymaz on 14/04/2019 11:54:52

Thread: Stratolaunch Lift off
14/04/2019 11:46:45

Agree !

14/04/2019 07:05:00

Just a quick video of the launch. She goes at 04:00 in.



Short documentary HERE

Edited By cymaz on 14/04/2019 07:09:07

Thread: RCM&E Fly-In 2019 - general chatter
13/04/2019 22:34:05

Great to see the RCME doing a fly-in’s been too long. Shame I will miss it. Good luck

Thread: DB Major Mannock
13/04/2019 20:02:19

Hope I’m not hijacking the thread. Three of us have been hard at work building a Giant Mannock

Myself and the other builders have been busy. Work has continued on the wings and tail surfaces. The engine and it’s reduction gear has been built and tested.


Thread: Infinity 90 Build
13/04/2019 13:36:14

Taking good advise from earlier postings I will add a bit of down thrust.

Mrs C is at work on Sunday, the weather is sunny combined with a howling no flying. I can settle down quietly on my own and get it done, after the housework though.

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