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Old May 06, 2015, 04:34 PM
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Ridge Rat.. ( modified )

Hi

I take one of the old models in box, to start a modified versión. The legendary Ridge Rat, created by Ed Sloblod, i want to change the fuse not with the "box" structure, other more rounded, in fiberglass,

I want to change the wings in foam, in balsa 1/16 skins... the new airfoil for best performance is changed by a HN-483.

Now the plans in PDF, and pics of the "old and classic" original versión.

Regards.
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Old May 07, 2015, 01:26 PM
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Looks like a fun project you have planned on this design.
There's a few Rats still around, I got one of mine out to the ridge about 6 months ago. Hope to do more flying with it this year.
Ridge Rat (10 min 4 sec)
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Old May 07, 2015, 06:04 PM
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the wings..

Hi

Thanks Mr. Welwood for your video and comments, today i start the wings and the skin balsa wood for it.

Now are ready to be joined and make the ailerons.

The pics of the wings, and the airfoil used.

Regards.
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Old May 07, 2015, 07:05 PM
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I built my ridge rat in the mid-1980's and am still flying it. It is a lot of fun.
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Old May 07, 2015, 07:33 PM
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the rat.

Shure Blaise,

It`s funny.. a lot of funny, and my intention is to make my own with more speed and light, tomorrow i put the pics of the plug fuse to make the molds...

The composite fuse is more strong and light.. I`m thinking to make a micro servo to move the rudder, but `m thinking this posibility.

Regards, ( nice cabin in your Rat... )
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Old May 08, 2015, 12:28 AM
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I love the Ridge Rat,...

....and recently acquired an original one that I've got scheduled for rehab.

I had previously kicked around the idea of cutting an EPP version with an updated airfoil, since the constant chord would make it short work for a Hot Wire. Maybe a MH30, HN-1038, S6062 or RG15 airfoil to help reduce the drag.

Your project may just re-ignite that EPP dream

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Old May 08, 2015, 10:12 AM
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Hi Chip, welcome to the thread, is very easy to make the wings... rectangular form with two airfoil pattern at same size.... I see your list of airfoil, about the RG-15 i think it`s the original configuration.

I have the wings and a piece of Wood to make my Ultron.. ( maybe you remember it. )... it`s the next Project after the Rat.

THE FUSE

I Begin the fuse with two sides in balsa, and build the 3 central sections to make the side of the fuse. I fill the interior of the box with isocianate ( two components ) The isocianate are 2 equal parts of chemical liquid and in few minutes it grow to have a strong foam. Its similar than a spary used in construction to fill unions of Wood in houses, Light Brown color.

Ather these step, i separate the two sides of the contour fuse in balsa, and use a lot of knife and sand with 80 grade sandpaper to obtain the base of the fuse, i cover the foam with 1/32 balsa Wood previously plenty of wáter in both sides to obtain the contour, and add a lot of White glue or Titebond glue.

Sand a lot, make the form of the fuse and use fiberglass tissue with poliéster resin to finish the plug.


In Pics the fuse plug before the sand and the bondo filler to obtain a good plug
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Last edited by gonzalo contrera; May 10, 2015 at 04:37 PM.
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Old May 10, 2015, 08:21 AM
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tail zone..

It`s time to start the tail zone, easy to do, the rudder and stab, glue and some kitchen weight to mantain in place...

Regards.
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Old May 13, 2015, 07:38 AM
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Keep going.....
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Old May 13, 2015, 11:16 AM
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Quote:
Originally Posted by gonzalo contrera View Post
..... I see your list of airfoil, about the RG-15 i think it`s the original configuration.

I have the wings and a piece of Wood to make my Ultron.. ( maybe you remember it. )... it`s the next Project after the Rat.
The original looks thicker, much more E374-ish to me.....at least from the drwg

I do remember the Ultron,.....will look forward to see that build, as well
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