VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics

  #11  
Old 01-28-2019, 11:32 PM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 86
Default Vibration

Has anyone with an RV-12 had to have the gear box repaired? I have about 450 hours now and after doing extensive trouble shooting the vibration still exists. A couple of people have said the problem is in the bear box. So I am wondering if anyone else has had gear box problems on the original RV-12 with about 450 hours on it.

Thanks.
__________________
John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 100 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a advancd Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
Reply With Quote
  #12  
Old 01-29-2019, 09:43 AM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 101
Default

The gearbox, it's shims, Bellvue washers and the dogs can and do wear on the Rotax 912. Rotax has recommended higher speeds of 2500 rpm for warmup procedure, to lessen the chance of the prop slapping the dogs back and forth when there is near zero thrust on the prop. ie, you should be taxiing at that speed also, and be on the brakes to check your taxi speed. Brake pads are cheap.

I believe the guy that teaches with Sling 2's in the Carson City, NV area has had the same problem with his Rotax gearboxes, his name is Paul... Maybe check on the Rotax forum for this problem?

Last edited by NinerBikes : 01-30-2019 at 07:03 PM.
Reply With Quote
  #13  
Old 01-29-2019, 10:05 AM
Phantom30's Avatar
Phantom30 Phantom30 is offline
 
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 654
Default

Quote:
Originally Posted by NinerBikes View Post
The gearbox, it's shims, and the dogs can and do wear on the Rotax 912. Rotax has recommended higher speeds of 2500 rpm for warmup procedure, to lessen the chance of the prop slapping the dogs back and forth when there is near zero thrust on the prop?
Along with NinetBikes comments....you bought your a/c with 300+ hours. If run @ lower idle speeds for ??? Times....this could account for wear.
__________________
Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2018 Dues Paid
Reply With Quote
  #14  
Old 01-29-2019, 10:27 AM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 86
Default Engine Vibration

I have run the idle above 2,000 towards the top of the green arch on the tach when the engine is cold every since I bought it. The prior owner or his mechanic told me about the slow idle problem so I have avoided it.
__________________
John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 100 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a advancd Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
Reply With Quote
  #15  
Old 01-29-2019, 02:54 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 101
Default

Quote:
Originally Posted by pilotyoung View Post
I have run the idle above 2,000 towards the top of the green arch on the tach when the engine is cold every since I bought it. The prior owner or his mechanic told me about the slow idle problem so I have avoided it.
Have it pulled and inspected, before you rule it out. Learn how to check end play and side to side play on it. There are some type of thrust washers on it that it's common for them to go out in 100 to 600 or 800 hrs and the lash values get too large..

Last edited by NinerBikes : 01-29-2019 at 02:56 PM.
Reply With Quote
  #16  
Old 01-29-2019, 03:34 PM
Dave12 Dave12 is offline
 
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,391
Default

Scroll down the Rv12 threads to Rotax uls912 vibrations solved.
__________________
Wag Aero Sport Trainer
N588DF RV12 #336 Sold
N73DF RV12 #244 Flying
Rans S21 Outbound (Coming soon)
Reply With Quote
  #17  
Old 01-29-2019, 05:17 PM
jcaplins's Avatar
jcaplins jcaplins is offline
 
Join Date: Feb 2006
Location: Davis, CA, USA
Posts: 495
Default

Just out of curiosity... how would you describe the vibration?

is it just roughness only at a certain rpm?
Roughness gets more or less noticeable as you move away from that RPM?
Is it a beat freq type vibration (subtle thrumming, like a twin with props out of sync)?

note: I don't have a Rotax, nor can I say anything about your gearbox. I'm just curious.
__________________
Jeff Caplins
California
RV7 N76CX
(started: Feb 2002 --> Completed: May 2016)
Reply With Quote
  #18  
Old 01-29-2019, 06:46 PM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 86
Default vibration

When I am at cruise speed, 5300-5400 and I reduce power to slow down, about 4600 it starts vibrating and I hear it and it continues to about 3000 rpm.

Both hear and feel it.
__________________
John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 100 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a advancd Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
Reply With Quote
  #19  
Old 01-29-2019, 06:54 PM
sirlegin's Avatar
sirlegin sirlegin is offline
 
Join Date: Feb 2006
Location: Keller, Texas
Posts: 283
Default

It's probably just rebelling about being an RV13?
__________________
Nigel
RV9A-N113SQ
52F
Reply With Quote
  #20  
Old 01-30-2019, 06:52 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 101
Default

https://www.rotax-owner.com/en/rotax...arbox-problems
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 11:41 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.