Engine hatch insulation suggestions

[jon__house]

Well, I've done all I'm going to do to the engine hatch. Fingers crossed it holds up as it was not easy spray and putting the acoustic foam on with the boat on the water and the hatch on. I had other things I wanted to do so I didn't have time to take it out for a test run but I will soon. Thank you for all the help!

 

[1BadTundra]

Well, I've done all I'm going to do to the engine hatch. Fingers crossed it holds up as it was not easy spray and putting the acoustic foam on with the boat on the water and the hatch on. I had other things I wanted to do so I didn't have time to take it out for a test run but I will soon. Thank you for all the help!

Nice, you're gonna love it... That makes a big difference

 

[MilesPrower]

Here's an FFT plot (magnitude only) showing before/after results of my 1'' DynaCore installation:



Y-axis = Magnitude in dB
X-axis = Frequency in Hz

The measurements are 5-sec average, and they were recorded — without calibration — on my phone, held next to my head, while running my 255 FSH Sport E on flat water at 5000 RPM, without A, C, or Z–weighting

In addition to the use of an uncalibrated recording device, how the device is held (and even minute movements of the device while being held) will affect the accuracy of the measurements. Therefore, take all this with many grains of salt. And speaking of take, I'd say the one takeaway is that DynaCore is effective at reducing the transmission of acoustic energy within the three octaves of 1–8 kHz.

 

[jon__house]

Nice, you're gonna love it... That makes a big difference

thank you for recommending the acoustic foam. 8k rpms and can have a conversation now.

 

[1BadTundra]

thank you for recommending the acoustic foam. 8k rpms and can have a conversation now.

Yes sir, like you have a new boat now!!