Floor vibration

Soarandtow · #1 06-09-2020, 07:05 AM

Forty plus hours and now very comfortable with my 9. BUT I have a floor vib at higher rpm 2300 and up. It's ok with feet on the floor but if you lift them both up you can hear and feel the vib. Note I have balanced my prop at max static rpm on the ground at 2300 down to .02 IPS which is very good for a fix pitch recip
Prop sensenich aluminum Engine Lycoming 0320
Just wanted to know if anyone else has had the floor vib

bkervaski · #2 06-09-2020, 07:15 AM

Not sure how bad your vibe is but seems to be consistent with every RV I've flown in.

You can add foam underneath your carpet, that helps. There is a special type of foam for this (Classic Aero adds it to their carpet) but not sure what it's called.

Ralph Inkster · #3 06-09-2020, 07:23 AM

Have you tried repositioning your tail pipes?

vfrazier · #4 06-09-2020, 10:26 AM

Very common.

You can try various things to dampen it. Report what works!

When I'm the passenger in my friend's RV-6, I like to put my foot on and off the floor rhythmically until my friend says "STOP THAT!"

Steve Barnes · #5 06-09-2020, 11:46 AM

I put in a floor 3/4 inch higher by riveting angles to original floor stiffners and putting a new floor on top (R/L sides) and elevator type stiffners to hold the strength. Also raised the rudder pedals 3/4 inch. I put foam between the 2 floors. No vibration or heat from the exhaust. Also did 1/8" rivets on the .040 floor to stiffners. No working rivets after 1300 hours.

Steve

koupster · #6 06-09-2020, 01:05 PM

I'm very happy with my carpet from Classic Aero. No vibrations from the floor ever. Closed cell foam pads Velcro to the floor between the stiffeners, and the carpet Velcros to the foam.

Cheers, David
RV-6A - KBTF

Soarandtow · #7 06-09-2020, 08:03 PM

Quote:

Originally Posted by Ralph Inkster

Have you tried repositioning your tail pipes?

In what mannaer do you mean on the tail pipes?
Further away from floor?
Shorter or longer?
Mine are Vans stock pipes about an inch from cowl and firewall

Soarandtow · #8 06-09-2020, 08:05 PM

Quote:

Originally Posted by bkervaski

Not sure how bad your vibe is but seems to be consistent with every RV I've flown in.

You can add foam underneath your carpet, that helps. There is a special type of foam for this (Classic Aero adds it to their carpet) but not sure what it's called.

A yes carpet and foam I will try a bet of bothThanks

DaleP · #9 06-10-2020, 06:53 AM

We ave some vibration in our 7A and have straight exhaust pipes. My friend has a 6A with downturned pipes and no vibration. I’m not sure if that is the reason his is smoother.

Southern Pete · #10 06-10-2020, 06:59 AM

I agree with Ralph, check the angle your tail pipes make with the floor. It is important the exhaust pulses do not hit the floor. Vetterman has some advice somewhere, I believe the pipes need to point away by at least 25*. I had the same problem some years ago because the original builder had cut the tail pipes down. Once restored to their original length, and angled appropriately, the floor vibration disappeared.

I have flown for 5 hours with no problems, before the surgery after 45 minutes my feet were numb.

Pete