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302 Engine Noise Level ?
Yup. I have the 2.63 firmware now, but no ENL sensor, and don't have a motor
glider but still get a ENL landout in SeeYou shortly after release. I had to upgrade firmware as a last resort to download a flight that got stuck inside the instrument during a contest. Dave Mercer "Bob Kibby" wrote in message . net... I have the engine noise level (ENL) upgraded Cambridge 302. I also have a motor glider. When I analyze my flights with SeeYou I get a "landed out" indication due to ENL when I haven't started my engine. When I compare my 302 ENL output with my Cambridge Model 20 ENL output I see a gross difference, i.e. the 302 output is an order of magnitude higher. Is anyone else with the ENL upgrade to the 302 experiencing this problem? Thanks, "2BK" -- ---------------------------------------------------- This mailbox protected from junk email by Matador from MailFrontier, Inc. http://info.mailfrontier.com |
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In article , Bob Kibby
writes I have the engine noise level (ENL) upgraded Cambridge 302. I also have a motor glider. When I analyze my flights with SeeYou I get a "landed out" indication due to ENL when I haven't started my engine. When I compare my 302 ENL output with my Cambridge Model 20 ENL output I see a gross difference, i.e. the 302 output is an order of magnitude higher. The original Cambridge ENL system as fitted to the models 10, 20 and 25, was based on a maximum ENL figure of 195. So a two-stroke motor glider should give fixes with ENL values of about this figure when the engine is run at high power. The more modern Model 302 conforms with the IGC Specification which requires that the ENL system uses the full three-number range from 000 to 999. So for that reason alone you will get some five times the ENL figures that you were used to with the earlier models (which have "grandfather rights" and were not changed from their original maximum ENL of 195 to 999). For any IGC approved recorder with an ENL system, the ENL numbers that you should get in various phases of flight, are given in Annex B to the IGC approval document. These are based on tests made by the IGC GNSS Flight Recorder Approval Committee (GFAC), that I chair. All current IGC approval documents are posted on the web at: http://www.fai.org/gliding/gnss/igc_approved_frs.pdf and for the recorders to which you refer: http://www.fai.org/gliding/gnss/cambridge10_20_25.pdf and http://www.fai.org/gliding/gnss/cambridge302.pdf For ENL figures, see para B4 in these documents. -------------------------- General If any recorder is producing very different ENL values to those given in Annex B to the approval, as a general rule it should be returned to the manufacturer for the ENL system to be re-set to the Annex B values (or to an agent of the manufacturer who is authorised to make such adjustments and to carry out a secure re-set on the recorder). GFAC has occasionally seen IGC files from recorders where the ENL values seem to have been set too low (not sensitive enough) and also too high (too sensitive). Fortunately, this is unusual. We remind manufacturers from time to time that when a recorder is sold it should conform to what it says in the IGC approval document. Pilots should check also, which is what you are doing! Some gliders produce an "organ pipe" sound if flown with the cockpit panels open and with either sideslip or at high speed. Since this can produce high ENL figures on the IGC file (but still lower than with engine) these conditions should be avoided. Again, see Annex B to the IGC approval document for the type of recorder that you use. Finally, if you still think that you have an anomaly in the IGC file from a particular recorder, you can always email the IGC file(s) to me and GFAC will have a look at it and advise you. -- Ian Strachan Chairman, IGC GNSS Flight Recorder Approval Committee Bentworth Hall West Bentworth Alton, Hampshire GU34 5LA ENGLAND Tel: +44 1420 564 195 Fax: +44 1420 563 140 |
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