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HomeScaleAircraftHelicopterScale Model RC Helicopters › Hirobo Tow Cobra Muffler Noise?
12-13-2004 05:55 AM  13 years agoPost 1
Nitrofxr

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Windsor, CA

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Can anyone suggest or advise on how to quiet my Cobra. I built the kit with the recommended OS .61 W/C and the square box style Hirobo muffler. It seems really loud and nasty for a "scale" job. Anyone else exerience this or have any alternatives?

Mike - keep flying!

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12-13-2004 09:37 PM  13 years agoPost 2
eitanh53

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ISRAEL

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I think this is the best solution
I think you need is sound-damping. You can buy it from Vario, this sound-damping material breaks up the vibration and REDUCE noise level considerably. The material is self-adhesive. The mat thickness 10mm & size approx. 200x1000mm.
The order number: 9 / 20 - Sound-damping material

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12-15-2004 04:09 AM  13 years agoPost 3
Nitrofxr

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Windsor, CA

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Hirobo noisey muffler
Thanks for the tip, however am perplexed as to how much insulation to use and where inside the fuse to put it. Also, does the stuff stick to a hot muffler or is strictly meant to adhere to the inside of the fuse?

Mike - keep flying!

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12-15-2004 10:57 AM  13 years agoPost 4
Huey Driver

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Stedman N.C.

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Well muffler noise is not too scale and neither is all the blue smoke and ya can't do much with that,sorry mate I know this isn't helping your situtation but some things ya gotta live with.There is a plus they sure look real from a distance.

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12-15-2004 08:48 PM  13 years agoPost 5
eitanh53

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ISRAEL

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Well since all fuselages are hollow bodies they inveitably resonate. the
mat moulds well into corners and rounded areas. Window openings are covered from the inside, then cut out again from outside. By the wat to protect the color from the heat of the muffler I put Vario - Heat
reflective mat (order no. : 9/25 ) between fuselage and muffler.

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12-19-2004 09:54 PM  13 years agoPost 6
AdeH

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Kent, UK

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Cobra muffler
Hiya friend

I went down the vario sound proofing route. Basically where ever I could put it inside the fuz I did!! It works a treat I assure you.

But I went another step and put a Century 60 size scale muffler on, mind you I have got a Thunder tiger 70 in it! I then made up two pipe exhaust and connected it to the normal muffler outlet. but fed it up and out of the actual exhausts.

To overcome the "smoke" problem I found a guy here in the Uk who makes his own fuel and it has minimal smoke present.

Hope this helps, and with a little time and lateral thinking.......who knows what you can acheive.

Regards
Ade

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12-20-2004 04:52 PM  13 years agoPost 7
JoeB1

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Ireland, Wicklow

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This is just a thought.......you can buy sound proofing products of different types from most good car stereo suppliers. From sprays to mats. Not sure how it will hold up to fuel but I would say you could cover the sides with some of the 10mm proofing wiht no probs. More than likely costs a fraction of the price from else where.
As I siad just a thought.
The Cent muffler is load anyway.

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