Author Topic: Landing Gear  (Read 612 times)

mattflyer

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Landing Gear
« on: Jan 23, 2018 »
I have a sonerai IIL with a 1/2in gear.  Finished the project a while back.  Came in at 550 pound empty weight, but that 1/2in gear still seemed really flimsy.  I added the radius blocks from grove to prevent from tweaking the lower longerons.  It didn't take much and in my opinion is totally worth it.
To achieve the incredible, you have to attempt the impossible!

N127PZ

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Re: Landing Gear
« Reply #1 on: Feb 04, 2018 »
I have always thought about these blocks. Did you make your own or purchase them? They seem like a very good idea. -Pete
Prayer does not use up artificial energy, doesn't burn up any fossil fuel, doesn't pollute. Neither does song, neither does love, neither does the dance.
Margaret Mead

mattflyer

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Re: Landing Gear
« Reply #2 on: Feb 04, 2018 »
I bought them from grove.  Here is the link:  http://www.groveaircraft.com/radiusplates.html
I actually used the radius plates.

Matt
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Chucker

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Re: Landing Gear
« Reply #3 on: Feb 06, 2018 »
My understanding (until now) was that the strap-on gear spring mount had enough flex to avoid damaging the fuselage longerons and attachment bushings....that it is only the bolt-on gear spring mount that had problems.  Now I am beginning to wonder....and scheme....as to what to do with my strap-on mount.

Does anyone have a good history on this issue?

Soneraifred

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Re: Landing Gear
« Reply #4 on: Feb 06, 2018 »
I’ve been flying with the strap-on gear for almost 32 years and almost 1600 hours (I haven’t counted the number of landings).  I started out with the 1/2” gear and changed over to the 5/8” gear a long time ago.  There have been NO problems.  Don’t over think this.  The 5/8” gear is twice as stiff as the 1/2” gear, so it is much less likely to effect the lower longerons, particularly when strapped on.
Fred Keip
Owner-SoneraiWorks LLC
Sonerai Newsletter Editor-Retired
Sonerai IIL, N99FK

mattflyer

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Re: Landing Gear
« Reply #5 on: Feb 06, 2018 »
My plane is proof that they can defiantly get tweaked.  Whoever had my plane last must of hit the ground kind of hard at one point because the cross tubes were a bit bent when I got the project.

Matt
To achieve the incredible, you have to attempt the impossible!

Chucker

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Re: Landing Gear
« Reply #6 on: Feb 07, 2018 »
Speaking of 1/2" gear...how did it work on the single-seat Sonerai?  Is it just a matter of maximum landing weight?  My project came with the 1/2" gear and I believe that the 5/8" gear weighs over 8 pounds more than its little brother.  I plan to operate at a maximum takeoff and landing weight of 750 pounds.  Is it worth giving the 1/2" gear a try?  Or, should I just bite the bullet and strap on another 8+ pounds?

Pttim

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Re: Landing Gear
« Reply #7 on: Feb 07, 2018 »
My typical takeoff weight solo is around 880lbs. My empty Sonerai is 625 lbs.  I initially had the 1/2 inch gear, probably with a slight bit of tow out.  This caused the gear to splay out during taxi and landing. I like the smoothness of the 1/2 gear but I like the stiffness of 5/8 gear much better.  True the 5/8 gear weighs 8lbs more initially but by the time I had my axles holes drilled and removed metal for clearance of the Cleveland calipers, the final gear weighed only 5lbs more.
Pttim
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mhflyit

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Re: Landing Gear
« Reply #8 on: Feb 07, 2018 »
5/8 and relax when landing!
Matt

Pttim

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Re: Landing Gear
« Reply #9 on: Feb 07, 2018 »
Relax when landing a Sonerai... that's kind of an oxy moron.   Good one Matt! :D
Pttim
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mhflyit

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Re: Landing Gear
« Reply #10 on: Feb 07, 2018 »
I thought you'd appreciate that Tim!!
Another way of putting it - why add extra stress!!  ;)
Matt

kennyw

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Re: Landing Gear
« Reply #11 on: Feb 07, 2018 »
I thought you'd appreciate that Tim!!
Another way of putting it - why add extra stress!!  ;)

I can appreciate it!  I have to consciously rest my knees on the against the fuselage in order to keep my lower legs from tensing up on the rudder pedals.  Its amazing how much quicker you can get your ducks in a row and make the first turn off when your left foot isn't fighting your right one on the rollout.

And, if I can relax on the stick, I can do a better job of nailing the flare so I don't bounce.
« Last Edit: Feb 07, 2018 by kennyw »

acrojohn

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Re: Landing Gear
« Reply #12 on: Feb 09, 2018 »
Matt,
Was there an issue with the length of the radius bars from Grove where they could not be used to serve both as a radius bar and strap? 

I have installed this same set up on my Acro II per the Aviat/Christen Eagle service advisory and it even holds up to my landings. The Grove landing spring and bars are made of 7075T6. Most other springs are much less expensive, but they are made of 2024.  The Grove gear is TOUGH - I believe their new Sonerai 1 springs are also 5/8ths thick.  If the radius bar length could accommodate the bolt attachment the heavy strap could be removed. 

I’d like to also forgo the need to use the heavy centering plates (.035 4130) shown in the Sonerai 1 plans.  My Acro II uses a single hour glass shaped .040 (6061T6) butterfly panel with several large lightening holes that is held in place with a single AN3 bolt to the center of the gear spring and the outer radius bar bolts.  Again, even my landings with the landing weight of 1540 lbs. does not stress this setup.  The doubled longerons would likely fail well before the centering panels and that .375 steel strap shown in the Sonerai I plans.

I’m trying to put my fuselage on a diet since I went heavy on the wing spars.  Any thoughts?
John
AcroJohn

 

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