Brakes

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mde168

Member
Joined
Sep 21, 2007
Messages
22
Location
Mankato, MN
I have a bicycle with disc barakes on the front and rear. The first time I used the front brake I almost flipped me and the bike over forward. This is a very light and efficient brake system and seems like a good idea for a braking system for the ultralight tail dragger I'm working on.

Has anyone out there used something like this or know of anyone who has?
 

mde168

Member
Joined
Sep 21, 2007
Messages
22
Location
Mankato, MN
How about just using bicycle wheels for landing gear. I know of one person who claimed to be using Tuffy plastic bike wheels. The large size of the wheel would greatly expand possible runway sites by allowing the use of rougher fields. Has anyone tried this?
 

Jeremy

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Joined
Feb 23, 2003
Messages
75
Location
Salisbury, England
Bicycle disc brakes work very well indeed and are a good idea. Bicycle wheels are not such a good idea, as unless rebuilt with stronger rims and spokes they tend to buckle when exposed to the typical side loads from a cross wind landing.

For a supplier of nice light wheels, already fitted with bicycle disc brakes, take a look at http://www.phantomaeronautics.com/ (scroll down to "options" and look for "disc brakes").

An alternative option is to look at using Mountain Board wheels and brakes, if you don't mind the small diameter. I have a set of these and they are really neat. I don't know whether the Mountain Board/ATB craze is worldwide, but here in the UK there are a few specialist shops. Here's a link to the shop where I bought my wheels and brakes: http://www.atbshop.co.uk/ (look under "mountain boards" then "spares and accessories").

I fitted bigger tyres to these wheels, industrial 3.00 x 4 barrow wheel tyres. These are slightly bigger than the standard tyres but fit the rims OK. The complete wheel, tyre, drum brake and stub axle weighs just 1.4kg complete (about 3lbs). The wheels and tyres are load rated at 200kg each, around 440lbs, so are plenty strong enough for an ultralight. The only slight problem is the small diameter, just over 10".

Jeremy
 

wally

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Mar 31, 2004
Messages
928
Location
southwest TN.
Many years ago there was a line of ultralights called Pterodactyl. The various models were known as Pfllegling, Ptraveler and some other names like that. I think they used Tuffy wheels.

The were very light and very slow tho.
Wally
 

mde168

Member
Joined
Sep 21, 2007
Messages
22
Location
Mankato, MN
I guess I hadnt considered the side load on a bike tire. Assuming I wont greese every landing perfectly, bike tires are probably not a good choice. Thanks.

I am going to look into those Tuffy wheels more. Ive seen pictures of Legal Eagles on their website and it looks like they are using them.
 

Dana

Super Moderator
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Apr 3, 2007
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9,136
Location
CT, USA
I've seen pictures of bicycle disk brakes used on a Kolb Ultrastar. Supposedly they work quite well. My Ultrastar, though, has the FBI Black Max brakes / wheels which also work quite well... I suspect some of the components are from a bicycle system.

-Dana

Chaste: why virgins run.
 

mde168

Member
Joined
Sep 21, 2007
Messages
22
Location
Mankato, MN
I looked at those tuffy wheels some more. They seem to be beefy enough for the job but attaching the rotors from a bicycle brake systems may be a challenge. I dont know much about plastics so maybe adding a plate to the outside of the wheel and sandwiching the center hub with that and the rotor. If I can figure out a good way to test it I would feel better about it. I see some kind of heavy cart in my future, rollong down a hill. LOL
 

Jeremy

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Joined
Feb 23, 2003
Messages
75
Location
Salisbury, England
If you take a look at the Phantom link I gave earlier, then you may get some ideas about how to attach the rotor.

Jeremy
 
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