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Permalink Reply by Ralph Sanson on December 26, 2011 at 3:52pm

http://www.lightaircraftassociation.co.uk/engineering/TADs/162%20ZE...

I don't think you have any problem with this. it's only a recommendation that might make it easier to get the CG more  forward when using the Rotax 912.

On my CH701 I sit on the aft CG limit at full loading because of the much lighter Jabiru 2200 engine. If it were a Rotax I would have fitted the battery in the aft fuse however with the Jabiru the battery is a PC925 mounted up front.

Ralph

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Permalink Reply by raymond lasnier snr on December 27, 2011 at 2:22pm

if the plane is flying if so leave well alone you will find that a lot of people will come up with all sorts  like increase the tail plane by two foot another good one move the front bulkhead two inches forward the best mod is fit a heavy battery up front works a treat  so they say  so there you are i fly a601 hd with heavy rr200  so my problem was the other way raymond lasnier

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Permalink Reply by John Clarke on January 2, 2012 at 11:01am

I have a 601 HDS that was built from a kit (not by me) in 1999.  There's no evidence that any mods were made to my aircraft and my aft C of G limit is 17.5" aft of datum, as per the LAA document.  So long as you don't pile a load of heavy stuff into the rear compartment (and would you really want a lot of loose articles there anyway?) then in practice there isn't a problem.

My W&B spreadsheet shows that the only time I'm likely to hit the aft limit is if I have a heavy (100 kg) passenger with me (I'm about 80 kg) and I'm down to my last 15 litres of fuel.  With 2 x 80kg people on board I could go down to 10 litres of fuel and have 5 kg in the back before reaching the aft limit.  I've never put it to the test but I'm told that the elevator becomes very sensitive once the aft limit is reached.  With a Rotax 912 I don't think it'd be possible to hit the forward limit.

Are you building nose or tail wheel?  So far as I'm aware, mine is the only 601 HDS tail wheel in the UK at the moment so some company would be nice!

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Permalink Reply by Zac Bumble on January 18, 2012 at 1:47pm

Hi John

Thank you for your considered reply, I am building with a rotax 912 but sorry am building the nose wheel HDS

Yours must be one of very few tail down HDS Zodiacs in the world not just the UK.  I am a long way from flying, still at a research stage and doing a lot of reading.

Sorry I cant be company for you but still very interested in this model, most are the new xl

I am building a UK registered aircraft but in France so progress is slow

Regards Gary

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