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Tuned pipes

Trying to find one

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Ian Bagshaw27/04/2017 14:56:51
35 forum posts

Does anybody know where I can get a tuned pipe in the UK, I have tried just engines but they no longer have any stock. I have been told a Hatori 700 would work but can't find a supplier. Weston uk have some but they are un-baffled which wouldn't work at my club.

The original plane had an OS red tuned pipe & a Hanno special, the restored version has an OS75AX.

Many thanks

Ian

Ultymate27/04/2017 15:04:40
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1652 forum posts
49 photos

Try Weston UK **LINK**

Nigel R27/04/2017 15:42:31
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746 forum posts
202 photos

Have you spoken to Weston? Their pipes are baffled as far as I know. Even if not, you could always use an add-on can.

Or, a Novarossi 50400, if you fancy getting it posted from the states.

Adrian Smith 127/04/2017 15:43:34
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1793 forum posts
605 photos

Ian, I have been through the hoop with tuned pipes so I can sympathise with you. In the end as I wanted a Hatori product I ordered it from the USA from GravesRC. I am not sure what they have now. However, there is a Hatori outlet in the USA too.

**LINK**

The tuned pipes are at the bottom that are compatible with OS. Buying from the USA direct is quite painless and I have found it easy enough to do it.

Ian Bagshaw27/04/2017 16:10:38
35 forum posts

Thanks,

I spoke to Weston their pipes aren't baffled which as we have a 82db limit wouldn't work. I will look at the states.

Many Thanks

Ian

Denis Watkins27/04/2017 16:42:53
2244 forum posts
115 photos

Your 75 with standard silencer Ian would be more powerful than anything on that model from the past

.

Martyn K27/04/2017 17:26:18
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4418 forum posts
3052 photos

I have a few pipes that I may not use. They are not pristine by any stretch of the imagination.

Have you measured the exhaust timing on the engine? A pipe may not actually bring any real benefit if it has a 'sport' timing which is typical on the AX range.

PM me if you want to try one but I suspect it may not bring any benefit but ad a lot of grief

Martyn

brian ball 127/04/2017 17:37:22
24 forum posts
10 photos

Ian

l have a Hatori pipe New in box 90/120 with all fittings any good?

Ian Bagshaw27/04/2017 18:25:53
35 forum posts

Hi Brian I messaged you but not totally sure how that works on this site, is the pipe a #900?

Bob Cotsford27/04/2017 19:09:59
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6928 forum posts
393 photos

I don't think 'baffled' is the right term when talking about pipes. Quiet pipes have a chamber surrounding or following the resonant cone, which is not really a baffle. Ask JE or Weston UK for a 'quiet' pipe! A Weston UK Genesis pipe and a prop setup for torque rather than revs should get you down around 80dBa.

Timothy Harris 127/04/2017 19:44:57
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558 forum posts
84 photos

Weston pipes are not noisy . I use them in both my sports boat and plane. But I'm afraid I do not have the DB readings. Their genesis pipes are the disk type (use a hollowed out flat disc at rear cone )rather than the more peaky double cone type so are a "throttle pipe" they do have noise reducing baffles at the end and work well and are not too critical. Speak to Weston they can help.

Timothy Harris 127/04/2017 19:49:52
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558 forum posts
84 photos

I use the pipe on my OS 55 AX and it does give it quite a few extra RPM. I would guess it still adds approx 10-20% more power. I will do a tachometer test at some stage 😊

Nigel R28/04/2017 09:07:10
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746 forum posts
202 photos

"I don't think 'baffled' is the right term when talking about pipes. Quiet pipes have a chamber surrounding or following the resonant cone, which is not really a baffle."

The JE pipes are a clone of the Hatori design - a single cone, followed by a parallel section, followed by a flat disc (baffle) - all followed up by several different size silencer chambers separated by baffles.

Ian Bagshaw28/04/2017 09:10:52
35 forum posts

The JE pipes would be ideal sadly I spoke to them and the people that manufacture them are no longer producing at the moment.

Bob Cotsford28/04/2017 11:18:12
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6928 forum posts
393 photos
Posted by Nigel R on 28/04/2017 09:07:10:

"I don't think 'baffled' is the right term when talking about pipes. Quiet pipes have a chamber surrounding or following the resonant cone, which is not really a baffle."

The JE pipes are a clone of the Hatori design - a single cone, followed by a parallel section, followed by a flat disc (baffle) - all followed up by several different size silencer chambers separated by baffles.

I'm almost tempted to cut my old pipe open to have a look at that! I must admit I thought the only baffle was the concentric outlet design, based purely on the external appearance.

Nigel R28/04/2017 11:59:34
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746 forum posts
202 photos

No more JE pipes then sad

I have the Novarossi I mentioned, this is also a baffled type, it is quite nice but not generally available here. May be worth contacting the UK agents to see if they could get one in. Planet Hobby in the states sell them and will do overseas post.

Timothy Harris 128/04/2017 13:19:56
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558 forum posts
84 photos

if you are really interested in tuned pipe theory etc I suggest you visit Prestwich Models website. Yes it is a BOAT website but boaters always run pipes on two strokes so have much more experience. Dave Marles who runs the site has lots and lots of free tech info plus a link to the "two stroke tuners handbook ". He is a World champion boat guy.

Ian Bagshaw28/04/2017 14:59:50
35 forum posts

Thanks for all the help I have family in the USA who are going to send me a Navarossi for $39 even though its made in Italy

I'll probably crash the plane first time out now!

Ian

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