https://www.mpba.org.uk/2022/03/21/noise/ The governing body for model boating in the UK Wed, 30 Mar 2022 15:37:13 +0000 hourly 1 https://wordpress.org/?v=7.0.2 https://www.mpba.org.uk/2022/03/21/noise/#comment-4765 Wed, 30 Mar 2022 15:37:13 +0000 https://www.mpba.org.uk/?p=15483#comment-4765 Dear Sir, I was shown your article in Propwash about noise in model racing boats by a friend who races FSR in the UK. I am currently building an FSR 7.5 that I purchased from my friend who is guiding me through the building phase. It will take me most of this year to build as I’m currently serving in the RN. You raised some interesting points that I would like to comment about.
You mentioned Osier Lake readings taken a few years ago. You don’t say anything about those readings.
Did you take ambient noise level readings before you started your testing? Very important to give you a base line on ambient noise.
The remedial work work carried out using carbon fibre for bracing, are you assuming all boats are carbon fibre in there construction. You state PMB pipes are the quietest, was the testing done with CMB/Nova Rossi after installing ribs and securing the tank cover with more screws.
Why use 45 Shore rubbers? are they technically proven to be quieter as a mount, you don’t say. You suggest fully foaming the hull of the 7.5 boat but not the 3.5, is there a reason for this?
Not all tuned pipes suit the same engine, so why do you recommend PMB pipes over others.
An interesting thread that lacks a lot of information. Well done for taking this task on.
Dave S Jones
NW Yorkshire.

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