VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-12
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 06-30-2017, 06:56 AM
scottmillhouse scottmillhouse is offline
 
Join Date: Apr 2007
Location: Madison, AL
Posts: 125
Default Engine Start without wings on?

I know you should never start a big bore Lycoming on a not fully assembled RV due to shaking dynamics. Anyone have experience with the small bore smooth running Rotax? Helping a friend do ALL the SBs and Rotax replacements on an older plane that has not been flown in about 5 years. With most all done he is itching to run the motor at his shop before painting to validate all the updates and replacements. I know it is not much work to reinstall the tail and wings but there is not enough space.
__________________
Scott- 2017 dues paid
RV-12 #120515, 319RV 155 hours.
1st flight 12/08/15, flew SNF, Oshkosh, Triple Tree & SERFI in year 1!
RV-9A, 536 hours, sold
Reply With Quote
  #2  
Old 06-30-2017, 07:09 AM
rv7boy's Avatar
rv7boy rv7boy is offline
Forum Peruser
 
Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,152
Default

Have you asked Van's? I'd like to hear what they say about this, or perhaps they've already addressed it.
__________________
Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/APRS Automatic Position Reporting System

“Certainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard
Reply With Quote
  #3  
Old 06-30-2017, 08:33 AM
mike newall's Avatar
mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,283
Default

There isn't any way a Rotax is going to torque it over on it's side, but the normal precautions of tie it to something substantial with a suitable robust rope or cable and don't rev it's nuts off.

We ran our 7 like that to check systems, leaks etc etc and am glad we did - found an ignition issue that could be fixed at the shop, not easily at the field.

As with anything, prep, check, ask yourself is it safe, don't let it lead to a Darwin event

Finally, if it does, make sure you have video and get your $250
__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated twice in 2016
Reply With Quote
  #4  
Old 06-30-2017, 08:37 AM
Rrhsch Rrhsch is offline
 
Join Date: Aug 2013
Location: Oconomowoc, WI
Posts: 43
Default

I tied mine down to a tree with wings off. I didn't have a problem.
Reply With Quote
  #5  
Old 06-30-2017, 08:56 AM
scottmillhouse scottmillhouse is offline
 
Join Date: Apr 2007
Location: Madison, AL
Posts: 125
Default

Quote:
Originally Posted by Rrhsch View Post
I tied mine down to a tree with wings off. I didn't have a problem.
That is what we were considering. I did the same for my old Kitfox for a full Rotax 2 cycle engine breakin. I was thinking that since the 12 has the structural wing box beam the fuselage is at full strength where the other RVs need the wing spar bolted in to complete the fuselage structure. Just planning a short run probably just to 2500 rpm to validate ignition and fuel systems.
__________________
Scott- 2017 dues paid
RV-12 #120515, 319RV 155 hours.
1st flight 12/08/15, flew SNF, Oshkosh, Triple Tree & SERFI in year 1!
RV-9A, 536 hours, sold
Reply With Quote
  #6  
Old 06-30-2017, 09:28 AM
rv7boy's Avatar
rv7boy rv7boy is offline
Forum Peruser
 
Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,152
Default

I remember Bob tied his 6A to a couple of stakes and maybe a tree when he tested that engine. But he did have the wings on.
Don't forget the fire extinguisher! We had no fires but I was ready just in case. 😀
__________________
Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/APRS Automatic Position Reporting System

“Certainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard
Reply With Quote
  #7  
Old 06-30-2017, 09:34 AM
Gagarin737's Avatar
Gagarin737 Gagarin737 is offline
 
Join Date: Mar 2009
Location: Netherlands
Posts: 606
Default

I tied the plane to the car:

https://www.youtube.com/watch?v=BRMHWbpxsPc
__________________
PH-BZT

MyKitlog
Picasa pictures
Reply With Quote
  #8  
Old 06-30-2017, 10:49 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 6,577
Default

Quote:
Originally Posted by scottmillhouse View Post
I was thinking that since the 12 has the structural wing box beam the fuselage is at full strength where the other RVs need the wing spar bolted in to complete the fuselage structure. Just planning a short run probably just to 2500 rpm to validate ignition and fuel systems.
The reason it is not recommended on the other RV models has nothing to do with fuselage strength (and it is not because of a fear of it rolling over). It is because of the inertial damping in roll that the wings provide.
The majority of the shake induced by a Lyc. is in roll. Without wings installed, there is much less mass to limit the shake.
There are documented cases of RV's having elevators and rudder damaged because of an engine start/shut down without wings installed.
Can it be a problem with an RV-12? Probably not, but I cant' say for sure because we choose not to take the chance.
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
  #9  
Old 06-30-2017, 11:47 AM
DBRuth DBRuth is offline
 
Join Date: Nov 2013
Location: Cumming,GA
Posts: 71
Default No wings start

I have run mine three or four times without the wings on to sync carbs or warm the oil prior to changing. Always chock the mains and use a strap on the tail tiedown to my truck. Nothing has fallen off yet.
__________________
N412DR
Kit 120797
First flight 8/21/15 what an awesome aircraft!
HOBBS @114.5
Reply With Quote
  #10  
Old 06-30-2017, 12:22 PM
funflying funflying is offline
 
Join Date: Oct 2006
Location: arvada, co
Posts: 355
Default

I too ran mine without wings like the prior post, and had no problems but was cautious. No taxing or full power run ups and nothing felt unsafe or being over stressed.
__________________
Patrick Claar
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:40 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.