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Old May 13, 2003, 10:20 AM
ParkScaleModels
zbrubaker's Avatar
United States, PA, Loganville
Joined Feb 2002
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90 Degree rotating retracts for parkflyers

I've just finished my design and prototype of a parkflyer sized, 90 degree rotating retract, perfect for an F-4U, P-40 or any home built plane.

the unit measures 1-1/4" long, 3/4" high and 1/2" wide. The height can be shaved/sanded down to about 5/8" once it's built.

It's made from lasercut 1/16" ply. Each retract weighs about 9-10 grams complete (not including wheel) and has a 1/16" music wire strut/leg.

I also have a design for standard retracts and a steerable nose wheel retract.

I'm looking for a few beta testers. If you are interested, please email me or send me a PM.

-Zeke
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Old May 13, 2003, 10:28 AM
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Neil Morse's Avatar
San Francisco, CA, USA
Joined Jul 1999
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Just sent you a PM

Neil
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Old May 13, 2003, 10:55 AM
29 rods from you in western WI
Karl Bē's Avatar
Joined Jan 2003
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PM sent. How much weight do you anticipate they will handle?

Karl
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Old May 13, 2003, 11:03 AM
ParkScaleModels
zbrubaker's Avatar
United States, PA, Loganville
Joined Feb 2002
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Quote:
Originally posted by Kinnic^2
PM sent. How much weight do you anticipate they will handle?

Karl
Hi Karl,

it would really depend on how it was built into the wing. I expect that these will work in any application where you would use 1/16" music wire for conventional fixed landing gear.

-Zeke
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Old May 13, 2003, 11:23 AM
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RiBell's Avatar
Canada, BC, Abbotsford
Joined Jan 2003
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Zeke
I've just acquired a Guillows F4U-Corsair. Guillows show retracts on the plan but they are display only. Don't see how they could stand up to any landing loads. I've just purchased the Robart units for the Ziroli Corsair, It will be a long way off. Need to save up for the rest of the big parts.

I would love to give your little units a try in the smaller Corsair. While I'm getting ready for the big one.
Servo? operated?
Rick
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Last edited by RiBell; May 13, 2003 at 11:26 AM.
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Old May 13, 2003, 12:34 PM
KSU Flyer's Avatar
Manhattan, Kansas, United States
Joined Oct 2001
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oh, me me me!

Man those are some good looking wheels...Where did you get the 3D model for those?

-Mike
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Old May 13, 2003, 01:53 PM
ParkScaleModels
zbrubaker's Avatar
United States, PA, Loganville
Joined Feb 2002
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Quote:
Originally posted by KSU Flyer
oh, me me me!

Man those are some good looking wheels...Where did you get the 3D model for those?

-Mike
You are just soooooo funny!

Let it be known herewith that Mike (KSU Flyer) is responsible for the 3D CAD model of the wheels used in the above pic of the retracts, and is henceforth entitled to all accolades, commendations, notoriety, privileges and duties in regards to said wheels.

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Old May 13, 2003, 02:03 PM
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Manhattan, Kansas, United States
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lmao
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Old May 13, 2003, 02:29 PM
Thats NOT indestructible
j8m8l's Avatar
London UK
Joined Apr 2002
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This had nothing to do with the retracts but.....

....mike, i am interested in doing some desiging this summer. Can you recomend a program to use? How hard is it to do somthing like the retracts?

Josh
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Old May 13, 2003, 02:37 PM
ParkScaleModels
zbrubaker's Avatar
United States, PA, Loganville
Joined Feb 2002
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Quote:
Originally posted by j8m8l
This had nothing to do with the retracts but.....

....mike, i am interested in doing some desiging this summer. Can you recomend a program to use? How hard is it to do somthing like the retracts?

Josh
I hope you don't mind me answering for you Mike...

Both Mike and I use a combination of AutoCAD and Autodesk Inventor and/or Autodesk Mechanical Desktop. AutoCAD is great for about 95% of the CAD work. When it comes to complicated 3D shapes is where Inventor/Mechanical Desktop comes in.

As to how long it takes to develop something like the rotating retracts....I've probably spent about 5 months trying dozens of different design ideas before I came up with this one.

-Zeke
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Old May 13, 2003, 03:23 PM
Thats NOT indestructible
j8m8l's Avatar
London UK
Joined Apr 2002
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Thanks Zeke.

If you already had an idea, and design (ie a motor mount) how long do you think it would take a newbie to cad it?

I am going to try TurboCad 7, as there is a cheap version, and i cant really afford AutoCad (i would love to be able to use it !)

Thanks

Josh
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Old May 13, 2003, 03:28 PM
ParkScaleModels
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United States, PA, Loganville
Joined Feb 2002
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That's pretty much impossible to answer. It really depends on how complex it is, how good you are at thinking/visualizing in 3D, how quickly you can learn a CAD program, your level of skill with a computer. Basically, if you can sketch what you want on paper, it shouldn't take too long to do it in CAD.

All I can say is to give it a try...learning to work with CAD is a great skill for any modeler to have.
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Old May 13, 2003, 03:33 PM
Thats NOT indestructible
j8m8l's Avatar
London UK
Joined Apr 2002
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Thanks

I consider myself to be good at "seeing" 3D.

I can hand draw designs well, isometerics etc, and have been doing design at school for the past two years (focusing on drawings etc).

Does anybody want to give me Acad? LOL

It would be somthing like the hacker mounts, only for a different motor, as this seems like a good simple place to start. I have access to two CAD milling machines, so i would like to make some stuff (for personal use).

Josh
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Old May 14, 2003, 05:23 PM
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Canada, BC, Abbotsford
Joined Jan 2003
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Zeke
Any word as to when we can get our hand on a set.
I'm just putting the radio gear in the project on the bench and then. F4U here we come
Rick.
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Old May 15, 2003, 08:19 PM
Leave me alone!
Martin Hunter's Avatar
Kamloops, BC, Canada
Joined Feb 2002
15,106 Posts
This is what I get for being away for 5 days

What would I have to do to steal a set of those for my upcoming beta KSU Hellcat? They look great. I'd probably scratch a second wing for the purpose of comparing with and without.

Martin
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