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Why No Retractable Gear On Aerobatics Planes?  
User currently offlineQFA380 From Australia, joined Jul 2005, 2083 posts, RR: 1
Posted (8 years 1 month 2 weeks 4 days 17 hours ago) and read 5452 times:

Why do no aerobatics planes have retractable gear? I have never seen one that does. Wouldn't it help quite abit if the plane was more streamlined?


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6 replies: All unread, jump to last
 
User currently offline2H4 From United States of America, joined Oct 2004, 8956 posts, RR: 60
Reply 1, posted (8 years 1 month 2 weeks 4 days 16 hours ago) and read 5445 times:
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Quoting QFA380 (Thread starter):
Why do no aerobatics planes have retractable gear?

Weight. Aerodynamics are comparatively less important, as aerobatic aircraft spend the majority of their time in low-speed flight.



2H4





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User currently offlineKELPkid From United States of America, joined Nov 2005, 6428 posts, RR: 3
Reply 2, posted (8 years 1 month 2 weeks 4 days 16 hours ago) and read 5443 times:

A Couple of guesses here:

The gear hanging out in the breeze helps generate drag (which can be a good thing in aerobatics...you might not want a plane that picks up speed in a hurry when you point the nose below the horizon). Also, a hydraulic pump (for a conventional single) would be an added, unecessary complication.

BTW, I can think of one common aerobatic aircraft with retracts (although it is ex-military): the T-34:


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User currently offlineZBBYLW From Canada, joined Nov 2006, 1993 posts, RR: 6
Reply 3, posted (8 years 1 month 2 weeks 4 days 16 hours ago) and read 5432 times:

Hey i have thought about this too. I think both the answers above are good answer but perhaps also the added stress of +/- 10 G's on an airplane with retractable gear would be a bit much and to strengthen them, the weight comes back into the picture. Also the thought like posted above off the added drag is very interesting indeed, but it just doesnt look as cool when doing a low and over.

Cheers Chris



Keep the shinny side up!
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 4, posted (8 years 1 month 2 weeks 4 days 15 hours ago) and read 5384 times:

Weight for a very small benefit in the intended regim of flight is the main reason, just as stated above. No doubt about it. Complexity and cost would be two other reasons. Why mess with and pay for a gear retraction system when you get very little, if anything, in return?

Rgds,
/Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineSprout5199 From United States of America, joined Feb 2005, 1855 posts, RR: 2
Reply 5, posted (8 years 1 month 2 weeks 4 days 13 hours ago) and read 5334 times:

Quoting KELPkid (Reply 2):
The gear hanging out in the breeze helps generate drag

And if the need to overcome the drag arises, just put a bigger engine on it. I'm sure the aero pilots would say "hmmm bigger engine? Is good"

Just my  twocents 

Dan in Jupiter


User currently offlineQFA380 From Australia, joined Jul 2005, 2083 posts, RR: 1
Reply 6, posted (8 years 1 month 2 weeks 4 days 12 hours ago) and read 5312 times:

Thanks for all you replys, has cleared up something I have been thinking about for a while.

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