VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics

  #1  
Old 01-29-2020, 05:00 AM
F1 Rocket F1 Rocket is offline
 
Join Date: May 2008
Location: Melboring, FL
Posts: 125
Default Floor board vibration

The forward floor board/bottom fuselage skin on my Rocket has a fair amount of vibration. Not normally an issue with the Velcro attached carpet I have in that area but itís very noticeable when pulling some G since I tend to dig my heels in a bit. Iím curious what others have done in this area.
__________________
Danny
F1 Rocket #25
N14ZM "Dreamer"
Melboring, FL
Reply With Quote
  #2  
Old 01-29-2020, 05:22 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,096
Default RV-4 similarities

I have two friends with Rockets, both carpeted and I have not heard either mention of vibration. I have been in both planes myself. I have an RV-4 with similar construction, and it is a known fact that exhaust exit pulses can present vibration or drumming depending on the exit pipe angle. I have a 4 pipe system that is smoothest with all 4 pipes turned inward a few degrees. I put a layer of 1/8" high density fireproof silicone mat with a .025" stainless sheet bonded on top under my rudder pedals to stop vibration and heat and I have no carpet in mine, simply because I like my heels to slide on the metal.
__________________
Bill E.
RV-4/N76WE
8A7 / Advance NC
Reply With Quote
  #3  
Old 01-30-2020, 08:18 AM
F1R F1R is offline
 
Join Date: Nov 2010
Location: ____
Posts: 786
Default Good Vibrations

Are your exhaust tips cut off at 90deg & pointing straight back? or are they angled downward slightly and cut off at an angle?

Dr. Dan Horton might be able to reference some research/ tests & or photos to illustrate what has been proven to reduce floorboard pulsation.

An SS skin on the bottom of the floorboard area would serve as a fire protection and properly done with a sandwich of vibration damping material, should calm and quiet things down.

I like the SS heel pads as described above for the inside.

I expect the F117 Engine nozzle theory might be useful to consider for your exhaust tips. Not so much for heat signature reduction , but for noise and vibration reduction.

https://aviationweek.com/aerospace/p...zzles-exhausts
Reply With Quote
  #4  
Old 01-30-2020, 08:42 AM
rocketbob's Avatar
rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,447
Default

Danny give me a call some evening. I have some exhaust turndowns I can send you to try. They were made by Vetterman.
__________________

Please don't PM me! Email only!

Bob Japundza CFI A&PIA
N673AC RV-7 borrowed horse
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
Reply With Quote
  #5  
Old 01-30-2020, 11:11 AM
F1 Rocket F1 Rocket is offline
 
Join Date: May 2008
Location: Melboring, FL
Posts: 125
Default

Quote:
Originally Posted by rocketbob View Post
Danny give me a call some evening. I have some exhaust turndowns I can send you to try. They were made by Vetterman.
Hi Bob,
Please send me your phone number via PM.
__________________
Danny
F1 Rocket #25
N14ZM "Dreamer"
Melboring, FL
Reply With Quote
  #6  
Old 01-30-2020, 01:01 PM
gereed75 gereed75 is offline
 
Join Date: Sep 2007
Location: pittsburgh pa
Posts: 517
Default

Might be work than your looking for, but I epoxied a foam core onto my RV-6 floor and then epoxied an aluminum sheet onto that creating a very stiff composite floor panel.

No vibration, exhaust pulses, nor heat and it provides a smooth floor without the mess of a carpet. I think it also gives the cockpit a more solid feel than most rv’s have.
__________________
Gary Reed
RV-6 IO-360
WW 200 RV now an Al Hartzell for improved CG
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 01:44 AM.


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.