Light Aircraft Silencers
Thread Starter
Light Aircraft Silencers
I'm just coming to the end of a project to re-engine my Luscombe with an 0-200 which has had the unfortunate side effect of me having to use an original exhaust system. As these are 'straight through' pipes I'm anticipating a large increase in noise! With the original C85 I used to have a Hanlon Wilson system which really knocked the noise down and was often commented on by strip owners. Now, here's where I'd like to pick your brains! Has anyone any experience of buying/using/fitting any of the add-on systems, i.e. the Leise or other types? I know the're all very expensive but then it is 'aeroplane money'!!!! I bet there's an expert out there!
Thanks for any feedback.
Spiney
Thanks for any feedback.
Spiney
Thread Starter
map5623
Yep. Am operating on a permit but understand that designing an efficient exhaust system requires quite a bit of knowledge so I thought I'd address the manufactured products first. I do have a standard Luscombe exhaust 'in stores' so thought an add-on might be the way to go. Also, I have a bit of a time issue for completion of the project unfortunately.
Spiney
Yep. Am operating on a permit but understand that designing an efficient exhaust system requires quite a bit of knowledge so I thought I'd address the manufactured products first. I do have a standard Luscombe exhaust 'in stores' so thought an add-on might be the way to go. Also, I have a bit of a time issue for completion of the project unfortunately.
Spiney
Silencers.
Hi Spiney.
Yep, there is a Liese/Leise expert out there.
Call Richard or Peter on 01628 823276.
Best of luck.
Sleeve.
Yep, there is a Liese/Leise expert out there.
Call Richard or Peter on 01628 823276.
Best of luck.
Sleeve.
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Silencers
Spiney
The guys listed by Sleeve will have you up and running with a Liese silencer very quickly, especially because you are on a Permit. No doubt you will have to process a minor modification through the PFA but they have a realistic outlook on life, unlike the Belgrano team.
To put a Liese silencer on a non-EASA CofA aircraft the Belgrano demands the whole nine yards of a new certification; ie a full design study and flight testing under B Conditions. It should be easier to get one onto an EASA aircraft, especially if it has already been certificated in another EASA state.
The guys listed by Sleeve will have you up and running with a Liese silencer very quickly, especially because you are on a Permit. No doubt you will have to process a minor modification through the PFA but they have a realistic outlook on life, unlike the Belgrano team.
To put a Liese silencer on a non-EASA CofA aircraft the Belgrano demands the whole nine yards of a new certification; ie a full design study and flight testing under B Conditions. It should be easier to get one onto an EASA aircraft, especially if it has already been certificated in another EASA state.
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It is possible to fit the Luscombe with the same Hanlon Wilson mufflers as the Cessna 150.
Also now that you have the 0-200 installed, and you have probably done it anyway, have you changed the Lord Mounts on the engine? With the larger, more flexible 0-200 mounts, the standard Luscombe engine mount becomes too flexible.
We have one here with the same installation and spacers were machined to fit inside the O-200 mounting lugs and then you can use the 65-85 rubber cones. As you are on the UK permit system this should present no problems if you should do it.
Regards.
Also now that you have the 0-200 installed, and you have probably done it anyway, have you changed the Lord Mounts on the engine? With the larger, more flexible 0-200 mounts, the standard Luscombe engine mount becomes too flexible.
We have one here with the same installation and spacers were machined to fit inside the O-200 mounting lugs and then you can use the 65-85 rubber cones. As you are on the UK permit system this should present no problems if you should do it.
Regards.
Thread Starter
Thanks all!
Lots of useful info as ever!
Speedbird 48
Yes. I've got the engine mounts sorted as you describe. The problem with the Hanlon Wilson exhaust, and particularly the mufflers is that they appear to be remade examples using an original as a pattern which means they are oversize. They've also been made to toe in to fit the cowl. This was fine with the smaller C85 oil sump but they won't pass the 6 qt sump on the 0-200 without a remake of the exhaust manifold.
Mandator and Sleeve Wing
That'll be WLAC engineering I presume. I don't suppose either of you have a Leise fitted? Just interested in a rough assesment of how the exhaust sounded after fit?
McF
Thanks for the PM, I think I may have seen an article on this in PF a while back. As I keep the back issues I'll sort it out.
Time to take in the info and have a gin and tonic evening I think!
Spiney
Lots of useful info as ever!
Speedbird 48
Yes. I've got the engine mounts sorted as you describe. The problem with the Hanlon Wilson exhaust, and particularly the mufflers is that they appear to be remade examples using an original as a pattern which means they are oversize. They've also been made to toe in to fit the cowl. This was fine with the smaller C85 oil sump but they won't pass the 6 qt sump on the 0-200 without a remake of the exhaust manifold.
Mandator and Sleeve Wing
That'll be WLAC engineering I presume. I don't suppose either of you have a Leise fitted? Just interested in a rough assesment of how the exhaust sounded after fit?
McF
Thanks for the PM, I think I may have seen an article on this in PF a while back. As I keep the back issues I'll sort it out.
Time to take in the info and have a gin and tonic evening I think!
Spiney
Silencers.
Quote :-
^^ I don't suppose either of you have a Leise (sic) fitted? Just interested in a rough assesment of how the exhaust sounded after fit?^^
Sure.
On the ground, at low RPMs, doesn't seem to reduce the noise particularly.
You'll notice the difference when the aircraft is airborne and the RPMs are up. Quite a reduction in the sound.
Main thing too is it apparently doesn't affect the performance one jot.
..............and even quieter with a four blade prop !
Rgds, Sleeve.
......... Sail Army !!
^^ I don't suppose either of you have a Leise (sic) fitted? Just interested in a rough assesment of how the exhaust sounded after fit?^^
Sure.
On the ground, at low RPMs, doesn't seem to reduce the noise particularly.
You'll notice the difference when the aircraft is airborne and the RPMs are up. Quite a reduction in the sound.
Main thing too is it apparently doesn't affect the performance one jot.
..............and even quieter with a four blade prop !
Rgds, Sleeve.
......... Sail Army !!
Thread Starter
Sleeve Wing.
Thanks, just the info I was after. I've always thought that if people are kind enough to let you use their strip then it's only fair to do your best not to upset their neighbours. Sounds just the thing...Only a two blade McCauley on the front though!
Spiney
Thanks, just the info I was after. I've always thought that if people are kind enough to let you use their strip then it's only fair to do your best not to upset their neighbours. Sounds just the thing...Only a two blade McCauley on the front though!
Spiney
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Check back through the magazine, there was an article about a simple pepperpot exhaust I seem to remember.
If you want to quieten the exhaust easily, a simple extension of the pipe with the end closed and multiple holes drilled around the last 4 inches of the pipe works very effectively - A friend had a system fitted to a Reims Rocket so it was CAA approved. Point to note is that the holes you drill must have an area greater than the original exhaust so that flow isn't restricted.
Check Airworld's site, they have a similar silencer.
If you want to quieten the exhaust easily, a simple extension of the pipe with the end closed and multiple holes drilled around the last 4 inches of the pipe works very effectively - A friend had a system fitted to a Reims Rocket so it was CAA approved. Point to note is that the holes you drill must have an area greater than the original exhaust so that flow isn't restricted.
Check Airworld's site, they have a similar silencer.
