Can FAR103 Ultralights have retractable landing gear?

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Aesquire

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Retractable gear is fine. You can even have a constant speed prop.

Just gotta keep the weight down....and the stall & top speed, fuel & number of passengers.
 

danmoser

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You can have a jet engine, retractable gear, in-flight adjustable pitch prop, flaps, slats, .. etc.
Lots of things prohibited by LSA & other classifications are allowed under ultralight rules.
Basically, all you have to comply with are empty weight (max. 155 lb. un-powered / 254 lb. powered), airspeed (24-55 knots powered), and fuel capacity (5 gallon max.) restrictions... and operate only during daytime while staying out of congested areas / controlled airspace..
FAR 103 is great that way .. lotsa freedom !! :gig:
 
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Aesquire

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IMHO, as a simple matter of practicality, retract gear on any aircraft needs a good reason for the mass and complexity.

At speeds under 70 knots, the percent improvement in speed isn't worth it. On a Lancair? Your call.

It does make sense in a motor glider, for L/D improvement, but you have to consider it as part of the overall drag bucket. Good fairings might be a better choice.

Amphibians, for obvious reasons.

Fighter replicas just for looks.

Because you want to.:)
 

Vipor_GG

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Unless you are going amphibious I don't see the need. The plane has to weigh in under 254lbs. That's hard enough to meet without adding something that really isn't needed.
 

Victor Bravo

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Because of the restriction in maximum cruising airspeed, you would be hard pressed to find a case where retract gear is justified on a powered aircraft. At 55 MPH the reduction in drag is not very significant.

Because of the weight, you would be hard pressed to find a case where you can afford the extra weight on a 155 pound glider.

One of the long-established tenets in glider design and soaring is that a well-faired fixed gear is much lighter and often lower drag than a mediocre retractable gear.
 

billyvray

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Newnan, GA
Many on this thread are correct that it's totally not worth it.

But it's cool. At least until you forget to put the gear down....



Bill
 
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