News:


  • May 04, 2024, 02:44:36 AM

Login with username, password and session length

« previous next »
Pages: [1]   Go Down

Author Topic: What is the best way to protect the needle valve on a profile plane?  (Read 1943 times)

Offline frank mccune

  • AMA Member
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1621
What is the best way to protect the needle valve on a profile plane?
« on: June 28, 2014, 06:04:10 PM »
      Hi All:

       What is the best method to protect the needle in the nva on a profile during an inverted landing?


                                                                                                                   Tia,
 
                                                                                                                    Frank
Logged

Offline Steve Helmick

  • AMA Member and supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 9950
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #1 on: June 28, 2014, 06:43:55 PM »
Best is rear NV, mounted parallel with the engine's cylinder...IMO. The Magnum/ASP remotes are quite nice, but I haven't actually run one myself. I put two on MECOA .28's, but those went to Glenn Reach (and haven't heard a word about how they ran, OBTW!).

I've run the OS .25LA with the stock RNV and didn't like it at all, but the threads are loose, NV wobbles like Elvis, so they leak badly.  H^^ Steve
Logged
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline Tim Wescott

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 12812
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #2 on: June 28, 2014, 06:48:31 PM »
The OS FP 20 remote needle valve is very nice.  The only complaint I have is that the fuel can pull back from the spray bar to the needle before you get the engine started -- this makes the prime more critical if you're hand-flipping, but if you get it right the fuel gets to the spray bar before the engine cuts out.

If you're still crashing often, I'd say the advantage of not bending needle valves all the time outweighs the disadvantages.
Logged
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Mark Scarborough

  • 2015
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 5918
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #3 on: June 28, 2014, 09:03:23 PM »
bend a piece of 3/32 music wire into a U shape,, about an inch or so long,, stick it into the top of the fuse next to the needle valve so that the u is taller than the needle,, now when you flip over it will hit the U instead of the needle
Logged
For years the rat race had me going around in circles, Now I do it for fun!
EXILED IN PULLMAN WA
AMA 842137

Offline Dennis Moritz

  • 22 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2464
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #4 on: July 01, 2014, 08:58:14 AM »
If your fingers still work ok (no carpal, no diabetic numbness or whatever) and you keep your wits about you when the engine lights up, cut the needle back to the clicker. Adjust needle by carefully spinning the disk. Saves the needle. Possibly shreds your fingers.
Logged

Offline Robert-Jan

  • Trade Count: (0)
  • Lieutenant
  • ***
  • Posts: 93
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #5 on: July 02, 2014, 03:30:53 AM »
http://lijnbesturing.nl/index.php/informatie/fotos?view=album&album=5699869323582862289&page=1

look at picture #19 and 20.
Put an aluminum elbow behind the needle and mount it at the engine.
We have "test" it many times  :)

Greetings Robert-Jan
Logged

Offline frank mccune

  • AMA Member
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1621
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #6 on: July 03, 2014, 06:15:00 AM »
     Hello Robert-Jan et.al.

     Thanks for the replies.

     I have some aluminum angle stock that will work well for making a needle guard.

     I mounted a wheel on the top of the nose just for laughs.  Looks very crude but effective! Lol


                                                                                                  Stay well,

                                                                                                  Frank

   
Logged

Offline Jim Kraft

  • 2015
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 3412
  • AMA78415
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #7 on: July 04, 2014, 02:04:47 PM »
On Fox needles or any other ones that are solid, I just cut the end off and bend them over like a Super Tigre needle. I have never broken on by doing that and they are still easy to adjust.
Logged
Jim Kraft

Offline James C. Johnson

  • 24 supporter
  • Trade Count: (0)
  • Commander
  • *
  • Posts: 198
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #8 on: July 10, 2014, 08:27:02 AM »
Back in the day we used to use a piece of plywood bolted on the outside using the engine bolts.. it sticks up but works like a charm... we used to also put a single wheel sticking up... mostly for touch and go's inverted..
Logged

Offline frank mccune

  • AMA Member
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1621
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #9 on: July 11, 2014, 08:04:51 AM »
     Hi All:

     Thanks for the replies!

      On one plane, I put a very thin, 1/8" wheel mounted via the top front engine mounting bolt that protects the needle valve well.

      On another, I made a bracket from aluminum as pictured in one of the replies.  It seemed to be too much labour for the task.

       If I fabricate another "guard" it will be a very simple piece of plywood or aluminum attached by the engine mounting bolts on the outside of the fuselage.

                                                                                                         Stay well my friends,

                                                                                                          Frank
Logged

Offline Chris Wilson

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1710
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #10 on: August 06, 2014, 08:46:45 PM »
I have always liked the coil spring Enya type needle valve posts - hard to seriously  hurt something that will simply spring back in place after being knocked
Logged
MAAA AUS 73427

You have enemies? Good. That means you've stood up for something, sometime in your life.
 Nothing in life is so exhilarating as to be shot at without result.  It's not enough that we do our best; sometimes we have to do what's required

Offline Garf

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1817
    • Hangar Flying
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #11 on: August 23, 2014, 09:35:10 PM »
Try planting the plane hard inverted. Those spring NV's will break. I have done it.
Logged

Offline Chris Wilson

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1710
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #12 on: August 26, 2014, 03:39:19 AM »
Quote from: Garf on August 23, 2014, 09:35:10 PM
Try planting the plane hard inverted. Those spring NV's will break. I have done it.
Sounds like a face plant of the quality that you are describing would break off any protrusion Garf.

My point is the more flexible it is the less that it will need protection in the first place - kinda solves the problem before it starts.

Angling the needle valve back will also give some modicum of protection.
Logged
MAAA AUS 73427

You have enemies? Good. That means you've stood up for something, sometime in your life.
 Nothing in life is so exhilarating as to be shot at without result.  It's not enough that we do our best; sometimes we have to do what's required

Offline Motorman

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 3266
Re: What is the best way to protect the needle valve on a profile plane?
« Reply #13 on: August 29, 2014, 06:27:39 PM »
Just before you land give it full down then full up and bonk it square on the nose.


MM
Logged

Advertise Here
Pages: [1]   Go Up
« previous next »
Tags:
 


Advertise Here