ahkirich
I have motor speed 3450kv but the sound is not to high...
if anybody know to make it louder
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JTiger
I don't know if there are any ways to do that. Why do you want it louder?
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Wingman_63
I too, cannot fathom why anyone would want to make their motor louder!
When I was a kid there was a "fad" whereby some people thought the noise of a piece of cardboard in the spokes of their push-bikes turned them into "bad*ss bikers".
So, maybe a bit of  cardboard in the prop would (temporarily) do the job!.... just a thought. 
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Wingman_63
... Regarding my comment above; BTW  - No Offence intended, just injecting some admittedly weak humour into the debate!
I think prop size, blade count and prop speed are  the variables to review in order to enhance the sound... 
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csitas
There is a small company that sells a sound maker. They are kinda pricey but, you can dial up just about any sound and volume that you want. I've only heard the airplanes and they sounded real. Google them .
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Wingman_63
I think the likes of Hobbyking and Bangood sell sound effects devices with a speaker... Aimed at engine sound synced to throttle. 
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solentlife
Hobby King and Banggood sold the SMS system (Sound Module System) which was also badged by FMS. Cheap unit that only had a radial engine sound ... but it works !
I have a pair ready for my big Lancaster when it finally gets built. I also bought couple of small amplifiers and extra speakers ... to really bring the 4 engines alive.

The others of course are the more expensive Dr Mad system and the one I can never remember name of - which both can be programmed for different engine types.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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shadeyB
ahkirich wrote:
I have motor speed 3450kv but the sound is not to high...
if anybody know to make it louder


i run 6x4 props on 2700Kv park jets and dam they scream as it zips past lol, did think about a muffler once and we’ll ........no I love a screamer 😂
Fly it like you Stole it
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Wildthing
Depending what motor you have and what it will take, up the voltage and put a smaller prop on. 😉 

For shits and giggles I took my NTM 2836 1200kv motor and 5X3 APC prop and wanted to see what thrust I could get out of it on 6S. Well first I never reached full throttle because the scream was so loud you needed hearing protection, the thrust was out of the world but I was simply afraid to take it up to full throttle without some kind of safety barrier .  I really expected the motor to just go poof up in smoke but I still am using it. 
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csitas
You can tell noone  flys in town.
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djdazzy
ahkirich wrote:
I have motor speed 3450kv but the sound is not to high...
if anybody know to make it louder

https://www.thingiverse.com/thing:3768355 try this?
Crashing since 2013.
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DualDesertEagle
I've noticed that my MiG-29 with the prop blades passing VERY close to the edge of the prop slot is pretty damn loud, whereas my X-31 with the prop a little further away from the foam is noticably quieter despite sporting the more powerful motor and smaller and steeper prop of the 2. And then look at nose-mounted props with no obstructions anywhere near the prop. As long as ur running them on a brushless motor and without a gearbox they go completely silent past a certain distance.


I would suggest to build a simple pusher plane (given how flush the F-16's engine nozzle is with the elevator's trailing edges anyway a profile F-16 would be the perfect plane for this purpose) with an adjustable motor mount so that u can move the prop closer to or further away from the wing plate and see how the proximity of the prop blades to the edges affects the noise.
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solentlife
Prop Slot models are notoriously loud ... my Mig 29 and Eurofighter can be heard far greater distance than any of my wet-fuel jobs !!!

When I first saw the title - Enhance - I assumed author wanted to better the sound ... on reading of course he wants louder ! 

Lets look at what creates the sound - given that E-Motors are basically 'quiet'.

1. Airflow over prop blades
2. Airflow spilling of the blades
3. Surrounding structure acting on that airflow
4. Surrounding structure acting as sound-board
5. Condition of prop blades
6. RPM of the prop

It is with some high speed motors /small prop combos that prop tips can literally go supersonic ...

Rough blades, nicked blades etc. increase sound

Hollow structures resonate sound

Prop slot edge if blunt close to prop creates more sound

Just a few factors.

I have read some claims that adding a V to the prop slot rear edge where prop air hits can reduce the sound ... the V is not just sanding the 6mm to a sharp edge ... but adding sheet both sides, then sanding to create a shallow V. I have no idea if it works.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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