slow fly/park fly DH 82a Tiger Moth

[bipeflyer]

Wonder if anyone out there interested in seeing pictures of my new,own design 28'' span Tiger Moth?The model weighs in at 10 oz,is powered by a Simprop 280 geared unit driving an APC 10x4.7'' prop.GWS Naro RX,
2x naro servos,270mAh 7 cell Ikarus nicad,
Ikarus ESC.I have achieved flights of 13 mins plus,the model can cope with 5-10 mph winds easily,if enough interest is achieved I will produce plans to build this traditionally constructed model,controlled by elevator/rudder.Follow this link: http://www.geocities.com/grumman_uk/web-28.html
Many thanks,Matt.

[jberg]

Nice plane!

Consider using Sanyo Twicell 700 AAA NiMH cells instead, they weigh the same but last much longer.

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Jochen

[bipeflyer]

Thanks for the info.Jochen about the NiMH cells,2 questions:What kind of duration can be expected from these cells,are any special procedures required when charging them?
Where can I buy them,I live in the U.K.
Thanks,Matt.

[jberg]

Matt,

if you get 13+min from 270mAh then I think your current is about 1A. At this low current I would expect 30+, perhaps 40min of flight time. I have a model that loads the Speed280 up to 2,5A on the bench, and I have enjoyed flights of 18-20min. You might need 8 cells due to the somewhat higher internal resistance of this cells. 8x700 Twicell/Speed 280/4:1 gear/APC SlowProp 9x6 is my preferred drive combination for park flyers up to 300g.

With a GWS drive I once had a 45min flight with a really lightweight model from 6 Twicell 700, but then the motor brushes failed (common problem with GWS drives at longer runs).

I have used my Graupner Turbomat 4 charger at 1A (delta peak method) without problems. I use an Ansmann ACS 410 now (DM 69,- universal NiMH/NiCd microprocessor charger) available from www.accu-profi.de (http://www.accu-profi.de) . I don't know if they ship to the UK (I myself am lucky to live about 10 miles from their shop http://www.rcmicroflight.com/ubb/smile.gif

Have fun!

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Jochen

[This message has been edited by jberg (edited 02-12-2001).]