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Jabiru Calypso (J120) max weight questions (US)

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(@jabiru)
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Thread transferred May 2018

Jabiru Calypso (J120) max weight questions (US)2 years 2 months ago#183

·         Adam Anderson

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I recently purchase a Calypso 3300 in the US. It is registered an Experimental and looking at the specs for this aircraft it appears (at least to me) that this airframe may be limited to 1100 max gross to meet the stall requirements of the Light Sport Aircraft rules.

I was wondering if it would be possible (or wise) to utilize vortex generators to knock a few knots off the stall speed and increase the max gross weight to closer to the 1320 max in the US?

Thanks

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Jabiru Calypso (J120) max weight questions (US)2 years 1 month ago#185

·         Doug Smith

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Hi Adam,
The Calypso airframe is a variant of the UL airframe. The UL was designed around a 990lb (450kg) gross weight and was itself a development of an earlier / lighter airframe. While there is some structural margin there, in cases like this the bigger part of the job is actually all the other stuff - like re-testing the stability etc. Plus we did a lot of work on the stall speed of the UL-D back in the day and got no real useful gain from VG's so unfortunately you're unlikely to get up to the category limit (circa 1320 lb or 600kg).
Regards,
Doug.

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(@henry587)
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I would like to talk to someone who was 

ultimately successful in increasing the gross weight of the Jabiru Calipso ( J120)


   
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(@nick1180)
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Doug,

There appears to be a few Calypso 3300 registered in Canada with a gross weight of 558kg (1230 lbs).  But in the U.S. the Calypso 3300 seems limited to just over 1100 lbs.  Is there an explanation for the difference in registering these same composite frames differently in both countries?  The Canadian Calypsos suggest at least increasing the gross weight to 1230 lbs is possible.  Perhaps there are known issues that now prevent Calypso gross weight up to 1230 lbs?

Any information is much appreciated.

Thank you


   
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(@jabiru-support)
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@henry587 

What is the MTOW of your Calypso now?  And what country are you in?


   
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(@henry587)
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In the USA. Experimental built.

Jabiru Calypso-6. Serial#612. 3300 engine. EmptyWt 718lbs.

Gross Weight 1103 lbs.


   
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