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Archive for January, 2014
Posted by epoxyearl | Jan 29, 2014 @ 10:17 AM | 12,934 Views
Well, we done moved the discussion to the "Builder's Workshop" to better be a part of the system RCG provides.
Posted by epoxyearl | Jan 25, 2014 @ 08:33 AM | 12,431 Views
The wing rib fixture is reaching it's final stages..Using the Fisher layout, it's a simple matter to assemble the ribs.
The problem with the Rascal wing, is that it only has 10 ribs that are similar.Then each rib is different,since they taper, due to the elliptical wing shape.

We 'fattened' Piper Cub J-3 airfoil, (can';t go wrong with that) and increased the undercamber a bit. The USA-35-B shape already has undercamber, and we want to insure a 26 mph stall speed.
Posted by epoxyearl | Jan 24, 2014 @ 10:48 AM | 13,023 Views
In 1986, I built a Fisher "Koala' ultralite.WE used all aircraft spruce, and a 1/2 Volkswagen engine.

All this time later, the Rascal now 'haunts' me as a design worth building.
-So we're off and running.Many hours on line, and at RCG has given me the information I needed to build one from scratch..

We had the plans enlarged 350% and built a work table 6' wide x 18" long of 3/4" plywood. Level, square and plumb.(and straight)

It'll be a couple of years in the making, so check in once in a while, if you like..Add your comments too.
Posted by epoxyearl | Jan 16, 2014 @ 09:19 AM | 11,376 Views
I still don't have my camera back,but that's not important at the moment.
What IS important is that wood is heavier than it used to be,...A perfunctory stab at estimating the weight of my proposed ultralite indicates it may be difficult to meet the weight limitation of 254 lbs., dry.

There's an option of getting to around 300 lbs, and registering it as a light sport, tho'.

I'm getting encouragement from several builders of ultralights, that it doesn't matter,to just go for it...and deal with the end result.

I've been ripping, stripping, notching, and cutting grooves in longerons..Wood working as a vocation and a hobby is certainly helpful, here..I'm well pleased with the scarf joints I'm making.....I used the FAA suggestion of an 8" scarf as a minimum, but went to a 12" one, so there's no question the joint is stronger than the wood.

If I meet 'weight' and don't need an inspection, I'll know it's safe, and if I need an inspection, The Inspector will know too.

Later.Earl
Posted by epoxyearl | Jan 09, 2014 @ 08:18 AM | 10,870 Views
I've been known to do some off the wall things in my day. Swinging off a rope from a tree over an 80 foot cliff, drag racing at 150 miles per hour on the strip
,and racing boats at over 100 miles and hour at APBA races.

In the late '80's, I built a Fisher Ultralite "Koala" , a Piper Cub look-alike, with half a Volkswagen engine. That clinched it- there was no doubt left in their minds that I was the village idiot.

Some 33 years later, it's still flying,although sold, and I'm embarking on a newer adventure.-Another ultralite, this time a "Rascal" clone, the Sig Rascal 110, enlarged 350 %....I'll use the Fisher procedures, just adapted to my outlines.

I took the fin and rudder to the Old Fart's Breakfast yesterday, and you may have thought I was one of the Wright Brothers, saying I was going to FLY !

The modelers assume it's another crazy attempt to kill myself, and the PILOTS think it's a great idea..

100 years after the boys flew for the first time, and modelers still don't believe......With the information available currently, what can go wrong?

Stall speed-26 mph, top speed 62, cruise 55, 23 HP Briggs and Stratton v-twin,4 cycle, with a belt drive reduction.Total weight (dry) 254 lbs.

Later, Earl