ceecrb1

I'm having problems with a servoless retractable... Its the nose wheel one so it is right by the ignition, and there is no other option of a place to put it.. due to the layout of the model... ie the ignition wont fit in the cowel and the nose wheel... well its in its place..


Any ideas of something I can put between the 2 to isolate/insulate the noise a little?


I know its a problem as when I fly, the nose wheel lowers and retracts as and when it wants to.... spends the entire flight like a yoyo.

a1pcfixer

My Feedback: (7)

First off, be certain that the ign wire cap is firmly seated onto the spark plug itself.

Secondly, you could try what some call a 'choke' on that servo......

Glitch Stop / Noise Trap
http://www.emsjomar.com/SearchResult.aspx?CategoryID=4

(second item listed on that page)

Also, post several photos of the area in question so others might better help you.

kmeyers

Sometimes when your sure it is one thing it is really something else. I say this because I just had a similar issue that turned out to be a loose ignition sensor connector.

Please supply more information on retracts, engine, radio and installation.

ceecrb1

here is the build thread of the model:
This part shows some photos of the plane and the layout..

http://www.rcuniverse.com/forum/post...sp?id=10894838

The plane does have 2 power sources, one for RX and one for ignition... the noise IS purely picked up at and by the nose retract as it is located right where the ignition box is, the only thing separating them is the firewall/nosewheel box..

I have installed a ferrite noise reducer on the cable leading to the nose wheel.. there is a little instability during flight but I cant be totally sure that it is due to the noise or turbulence or another reason untill I get rid of this issue..

I'm wondering if installing some wire mesh or something like that between the two will act as a Faraday cage or something similar....

a1pcfixer

My Feedback: (7)

Link is no good, should be like this....
http://www.rcuniverse.com/forum/fb.asp?m=10965582

Bottom r-h corner of each msg is "Post# xx", r-c on that then copy/paste back here.

ceecrb1

OOPS

another try

http://www.rcuniverse.com/forum/m_10...m.htm#10891594

a1pcfixer

My Feedback: (7)

OK, now that I can see your setup, I got 2 ideas to fix your glitch;

1) In the following image, you can easily mount the ign module on that large clear area of the firewall, outside by the carb.
Just re-route your vent line, and coil up the ign wire.



2) Your spark plug cap is NOT seated fully, which could in & of itself be your whole problem.
Once correctly installed, it should completely cover the hex of the plug.
***Note; this issue might be best to fix first!

Re; item 1.....I know relocating the ign module can be done & in tight areas, I've done it on my H9-Twist 150 3D.......

ceecrb1

yeah the cap isnt fully installed in that photo because it wasnt fully... well installed.. it was just "located" for that stage of the build and the photo..

I promise that it IS well seated now

The ignitian will fit in that space yes.. but I was really worried about it overheating there and reducing airflow to the carb and around the head.... comments?

To be really honest though.. it will still be the same distance away from the nose wheel........ where the vent line is pointing in that photo is where the nosewheel is.....

a1pcfixer

My Feedback: (7)

Heat shouldn't be a big issue, you've got lots of space there.

You can try what I suggested -or- leave it as is and live with it. But sometimes moving ign/rcv parts a little bit cures the case of the gremlins you've got.

That EMS Noise Trap often fixes similar issues, but if that's not to your liking, try...........

TBM 12" Servo Wire Pair, twisted....
http://www.troybuiltmodels.com/items/TBMW1.html
....other lengths available too.

You need to get as much space as possible, between any rcv/servo/wires and the ign high tension wire as you can get. A 'choke' (EMS) -or- twisted wire servo extensions often helps. On my H9 Twist there's only 3" between the ign & throttle servo, yet it behaves well.

ceecrb1

Yeah i already have tried a choke on the wire leading to the nosewheel..

As a last resor i'll just power the nosewheel from the ignition battery with its own rx so it is completely isolated from the rest of the system...