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03-18-2010, 05:46 PM
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Join Date: Dec 2008
Location: na
Posts: 1,457
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Starting Engine In Drive-Way
Anybody give your engine a test run in the driveway without the wings installed? Sure would like to do this prior to moving everything to the airport in a few months. Obviously taking all the fuel/fire precautions and ensuring kids,pets and neighbors are notified I can't think of a reason why using a properly grounded gas can and chocked plane would be a problem. Thoughts?
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03-18-2010, 05:51 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Highly NOT recommended
Ken there was a thread and even a u-tube video with engine start in the driveway without wings attached and short taxi. Look for the thread, tons of good points against doing it.
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03-18-2010, 06:24 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,507
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Not Recommended
Engine start without wings is NOT Recommended. There is very little to gain and much to lose.
See this video before you try it. It shows what can go wrong.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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03-18-2010, 06:43 PM
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Join Date: May 2005
Location: Santa Barbara, CA
Posts: 1,324
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Start it when the airplane is ready to be flown.
Quote:
Originally Posted by RV8R999
Sure would like to do this prior to moving everything to the airport in a few months.
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Along with the very real safety concerns, if it is a new engine, you really don't want to run it and then let it sit for "a few months" unless you pickle it for storage. Hangars are really good at making condensation.
John Clark ATP, CFI
FAA FAAST Team Member
EAA Flight Advisor
RV8 N18U "Sunshine"
KSBA
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03-18-2010, 08:50 PM
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Join Date: Dec 2008
Location: na
Posts: 1,457
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WOW!!! I won't be doing that I can tell you. Those gear legs folded like noodles. Something else besides not having wings must have been going on with that plane. Im not familiar with LANCAIR gear design but the oscillation after he jumped the chocks was probably exacerbated by the low empty weight leaving the gear with much less preload thereby changing the resonant frequency of the spring/mass/damper system...I'm only guessing. Can you imaging how bad that guy must of felt after that!
Ok.I'll wait. That was enough for me.
Thanks!!!
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03-18-2010, 09:00 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by RV8R999
WOW!!! I won't be doing that I can tell you. Those gear legs folded like noodles. Something else besides not having wings must have been going on with that plane. Im not familiar with LANCAIR gear design but the oscillation after he jumped the chocks was probably exacerbated by the low empty weight leaving the gear with much less preload thereby changing the resonant frequency of the spring/mass/damper system...I'm only guessing. Can you imaging how bad that guy must of felt after that!
Ok.I'll wait. That was enough for me.
Thanks!!!
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I think the airplane only jumped the left chock. The right one did a great job folding back the gear on that side. I'm guesing his downlocks weren't properly installed.
That had to be a bad day...
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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03-18-2010, 09:07 PM
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Join Date: Feb 2006
Location: Davis, CA, USA
Posts: 540
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That's a pretty damning video, but I don't think it proves the point.
I'm not trying to be contradictory.... I agree with all the reasons for having the wings on before firing up the engine.
I have seen that video used many times to support the argument. I also believe that the problem in the video was the gear being retracted (it's not a fixed gear), which may or may not have had anything to do with the wings.
just saying is all.
__________________
Jeff Caplins
California
RV7 N76CX
(started: Feb 2002 --> Completed: May 2016)
Last edited by jcaplins : 03-19-2010 at 07:14 AM.
Reason: got grammer?
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03-19-2010, 04:34 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by RV8R999
WOW!!! I won't be doing that I can tell you. Those gear legs folded like noodles. Something else besides not having wings must have been going on with that plane. Im not familiar with LANCAIR gear design but the oscillation after he jumped the chocks was probably exacerbated by the low empty weight leaving the gear with much less preload thereby changing the resonant frequency of the spring/mass/damper system...I'm only guessing. Can you imaging how bad that guy must of felt after that!
Ok.I'll wait. That was enough for me.
Thanks!!!
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IIRC, that Lancair was an RG and the Gear started to retract, which is why he had a problem.
I know of one RV-8 that was run w/o the wings on and with no problem. However, if it were me, I would want the wings and all the control surfaces installed so I had some control, if it started to move.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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03-19-2010, 06:54 AM
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Join Date: Feb 2008
Location: va.
Posts: 523
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I pushed my homebuilt, not an RV, out of the shop and chained it to a tree for the first start, no problems. It was a mid-time engine and I don't live in town. Be sure your pets and children are away and nothing is around that can get sucked up by the prop. If you're not going to be flying soon you will need to pickle your engine. You can spray oil in the carb until the engine dies and that helps, but it still needs more for long term storage.
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03-19-2010, 07:15 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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George Orndorf does this on one of his video's....Remember those way back in the day?
I would not do it though. The wings add some dampening to the airframe to absorb all those waves of energy.
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