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Just started test flying Sonex #1571 LN-SNX in Norway. It's a blast to fly. I notice significant noise from the flat fuselage bottom plates while taxiing and there is also fuselage noise during flight. Has anyone on the forum tried out any means to reduce this issue?

I wear a headset. Weight is the enemy.

Bryan Cotton wrote:I wear a headset. Weight is the enemy.

I use Clarity Aloft ... weight is the enemy! 8~)

I fly in controlled airspace so use a headset. Still cant't help noticing the 'tin can' noise from the flat parts of the fuselage. I was thinking of putting some lightweight foam on the inside of the largest flat areas. Anyone tried this or other noise reduction measures without adding too much weight?

I remember someone used angle pieces, just 1x1x.025 or maybe less, attached diagonally across panels with double sided tape. Effective, but no analysis of how these may concentrate stress at their ends.

cjaeger wrote:Just started test flying Sonex #1571 LN-SNX in Norway. It's a blast to fly. I notice significant noise from the flat fuselage bottom plates while taxiing and there is also fuselage noise during flight. Has anyone on the forum tried out any means to reduce this issue?

Pneumatic tailwheel tire for ground operations and a Halo in the ear headset for ground and air operations. Both combine to make a significant reduction in "noise" without adding any weight.

Art,,,,,,,,,,,,,,,Sonex taildragger #95,,,,,,,,,,,,,,,,Jabiru 3300 #261

GordonTurner wrote:I remember someone used angle pieces, just 1x1x.025 or maybe less, attached diagonally across panels with double sided tape. Effective, but no analysis of how these may concentrate stress at their ends.

I saw this on another build and I am considering doing this to reduce the oil canning noise from the tail. I just don't know about double sided tape. If they come loose they could interfere with the controls. I am considering fully riveting them, or double sided tape with one rivet at each end.

I installed the angle pieces.. still building
I like the 2 Rivet Idea

WaiexB22 wrote:

GordonTurner wrote:I remember someone used angle pieces, just 1x1x.025 or maybe less, attached diagonally across panels with double sided tape. Effective, but no analysis of how these may concentrate stress at their ends.

I saw this on another build and I am considering doing this to reduce the oil canning noise from the tail. I just don't know about double sided tape. If they come loose they could interfere with the controls. I am considering fully riveting them, or double sided tape with one rivet at each end.

I have had mine in place for 9 years. I used the 3M VHB (very high bond) double sided tape. I stuck them on with double sided carpet tape during my build, and one day I found two of them on the floor! Took them all off and re-stuck with the VHB. It's pretty powerful stuff.

http://www.mykitlog.com/users/display_l ... 181&row=11
http://www.mykitlog.com/users/display_l ... 191&row=10
http://www.mykitlog.com/users/display_l ... 8137&row=8

In my TLAR engineering expertise…the risk of riveting is creating stress points in an in-engineered way. The tape spreads the load evenly over the whole area, and probably has a little give in the bond. I know stresses will transmit to the ends of these trusses.