Large Model Association Forum

Advice please? I have a Saito FG 60R3 engine and a Saito FG 90R3 4 stroke engine. Both are marginal on noise levels at our local club.
What have you found to be the most effective propellers at keeping noise levels down?
Are there any other measures that may help?

My 90r3 is quite noisy - which is a lot of it's charm, I'd try a keleo ring silencer first, or at least ask someone who has, I believe they work well.