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Question about Ground planes?

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jeffrey-j-paris(at)excite
Guest

Posted: Fri Mar 12, 2010 2:37 pm Post subject: Question about Ground planes?

Dear Europaphiles,

 

A quick question regarding ground planes and antennas;  Does a  ground plane need to be connected by wire to the main grounding  point in the aircraft?



 

I can't find any really good explanations in my aircraft information literature.



 

Cheers,



 

Jeff Paris Europa Monowheel Classic #A012 Jab 3300  95% there 95% to go!



 



 

                                                     Improve your career health. Click now to study nutrition!                          Nutrition                          Click Here For More Information                                [quote][b]

jimpuglise(at)comcast.net
Guest

Posted: Fri Mar 12, 2010 3:51 pm Post subject: Question about Ground planes?

Jeff- 

  

In a glass airplane you are much better off with a dipole.  All a ground plane does is make it possible to use a quarter wave antenna instead of a half wave.  For the Europa, there are several places you can put a vertical dipole.  Which radio are you asking about?  To answer your question directly, the ground plane is stand-alone, just like the other half of a dipole.  If I were doing a ground plane in a Europa, I'd probably use several strands of copper wire or a thin aluminum plate under the vertical quarter wave.  If you are near a library, check a copy of the "ARRL Handbook 2010" for a full discussion of ground plane antennas.  You could also Google "Ground Plane Antenna."  I did and I found a calculator for an amateur ground plane.  All you need to do is plug the desired center frequency into the calculator, and it gives you the radial and whip lengths.  

  

BTW, I am also about 95% with a tri-gear with a Jabiru 3300.  Wings, elevators, rudder, doors are at the painter and I am finishing the engine installation.  

  

Jim Puglise A-283    



---

budyerly(at)msn.com
Guest

Posted: Fri Mar 12, 2010 3:53 pm Post subject: Question about Ground planes?

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Jeff

 Emphatically yes.  

  

 Bob Knuckles book the Aeroelectric Connection has a good section on  antennas.  Different antennas require different ground planes, and his book  does a good job.  Well worth the money.

  

 Once you get into avionics, a lot of self study and and good crimping tools  will make all the difference in your planes electrical performance.

  

 Regards,

  

 Bud Yerly

 CFC Europa Dealer

 [quote]   ---

fklein(at)orcasonline.com
Guest

Posted: Fri Mar 12, 2010 7:50 pm Post subject: Question about Ground planes?

On Mar 12, 2010, at 3:44 PM, jimpuglise(at)comcast.net (jimpuglise(at)comcast.net) wrote:

 	  Quote: 	
		  BTW, I am also about 95% with a tri-gear with a Jabiru 3300.  Wings, elevators, rudder, doors are at the painter and I am finishing the engine installation. 	




Jim,

Would you mind letting me (us) know what prop you'll be using, and your rationale for your decision?

Thanks,

Fred



 [quote][b]

jimpuglise(at)comcast.net
Guest

Posted: Fri Mar 12, 2010 10:12 pm Post subject: Question about Ground planes?

Fred- 

  

I'm using a Sensenich ground adjustable.  I have been working with Flight Crafters and it is their recommendation.  They have installed several with good results.  It is really a pretty slick setup.  The two blades are slaved, so you only need to adjust one, and there is a small gauge on the hub indicating the pitch.  

  

Jim 

 

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fklein(at)orcasonline.com
Guest

Posted: Fri Mar 12, 2010 10:40 pm Post subject: Question about Ground planes?

On Mar 12, 2010, at 8:12 PM, jimpuglise(at)comcast.net (jimpuglise(at)comcast.net) wrote:

 	  Quote: 	
		  I'm using a Sensenich ground adjustable. 	




Sounds good Jim...I've just spent the past few days emailing back & forth w/ Sensenich (Charley)...fortunately (for me) the Jab 3300 blade is also available as a "pusher" and can be set up as a CCW rotating tractor for my Sube...I figure it will be a nice "known" factor during initial flight testing...(not that I'm anywhere's  near doing any).

Fred



 [quote][b]

grahamsingleton(at)btinte
Guest

Posted: Sat Mar 13, 2010 4:02 am Post subject: Question about Ground planes?

Jim

I think its a pity Sensenich don't do three blades. Two blades always cause yaw vibration which can't be balanced out. (due to the different AoA of the two blades when aircraft pitch is not the same as engine pitch, ie hi power climb) Three blades automatically balance it out.

Graham

From: "jimpuglise(at)comcast.net" <jimpuglise(at)comcast.net>

To: europa-list(at)matronics.com

Sent: Saturday, 13 March, 2010 4:12:14

Subject: Re: Question about Ground planes?

p {margin:0;}

Fred- 

I'm using a Sensenich ground adjustable.  I have been working with Flight Crafters and it is their recommendation.  They have installed several with good results.  It is really a pretty slick setup.  The two blades are slaved, so you only need to adjust one, and there is a small gauge on the hub indicating the pitch.  

Jim 

---

loboloda(at)execulink.com
Guest

Posted: Sat Mar 13, 2010 6:15 am Post subject: Question about Ground planes?

Hi Guys,

I hope the Sensenich works well as I have one on order, should be here in April.



Whirl Wind now advertise 2 and 3 blade ground adjustable props, but the diameters appear to be more than most owners would want.



Dave 

do not archive 

On 13-Mar-10, at 6:33 AM, GRAHAM SINGLETON wrote:

[quote]Jim

I think its a pity Sensenich don't do three blades. Two blades always cause yaw vibration which can't be balanced out. (due to the different AoA of the two blades when aircraft pitch is not the same as engine pitch, ie hi power climb) Three blades automatically balance it out.

Graham

From: "jimpuglise(at)comcast.net (jimpuglise(at)comcast.net)" <jimpuglise(at)comcast.net (jimpuglise(at)comcast.net)>

To: europa-list(at)matronics.com (europa-list(at)matronics.com)

Sent: Saturday, 13 March, 2010 4:12:14

Subject: Re: Question about Ground planes?

Fred- 



I'm using a Sensenich ground adjustable.  I have been working with Flight Crafters and it is their recommendation.  They have installed several with good results.  It is really a pretty slick setup.  The two blades are slaved, so you only need to adjust one, and there is a small gauge on the hub indicating the pitch.  



Jim 



---

Jeff(at)rmmm.net
Guest

Posted: Sat Mar 13, 2010 6:50 am Post subject: Question about Ground planes?

Dave and others,I have about 100 hours on my sensenich 912-S combo. So far I can say I love it. Easy to adjust, all bolts have never changed torque when checked and my performance is slightly better than the warp drive that I started with. 



 Jeff R.  N128LJ Gold Rush... Annual done, electrical problems solved, and back in the air... ;o)



 

  

On Mar 13, 2010, at 8:23 AM, david miller wrote:

[quote]Hi Guys,

I hope the Sensenich works well as I have one on order, should be here in April.



Whirl Wind now advertise 2 and 3 blade ground adjustable props, but the diameters appear to be more than most owners would want.



Dave 

do not archive 

On 13-Mar-10, at 6:33 AM, GRAHAM SINGLETON wrote:

[quote]Jim

I think its a pity Sensenich don't do three blades. Two blades always cause yaw vibration which can't be balanced out. (due to the different AoA of the two blades when aircraft pitch is not the same as engine pitch, ie hi power climb) Three blades automatically balance it out.

Graham

From: "jimpuglise(at)comcast.net (jimpuglise(at)comcast.net)" <jimpuglise(at)comcast.net (jimpuglise(at)comcast.net)>

To: europa-list(at)matronics.com (europa-list(at)matronics.com)

Sent: Saturday, 13 March, 2010 4:12:14

Subject: Re: Question about Ground planes?

Fred- 



I'm using a Sensenich ground adjustable.  I have been working with Flight Crafters and it is their recommendation.  They have installed several with good results.  It is really a pretty slick setup.  The two blades are slaved, so you only need to adjust one, and there is a small gauge on the hub indicating the pitch.  



Jim 



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ami(at)mcfadyean.freeserv
Guest

Posted: Sat Mar 13, 2010 7:41 am Post subject: Question about Ground planes?

Graham, 

 Sensenich do do three blades on their  composite prop (or they had it in development a couple of years ago).  Probably the combined blade area will be too great for the 912S. And the  price, given what only two blades cost.

  

  

 Duncan Mcf.

 [quote]   ---

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