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George Sychrovsky

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About George Sychrovsky

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  1. if its leaving strands start pulling it from the opposite direction
  2. The size of the stick really does matter, I have three sizes round dowels sticks ¼ “, 3/8” and half inch. On bigger batches like 400 gr. the mixing goes a lot faster with a half inch stick. Trying to mix half a kilo with a quarter inch stick is hopeless . George
  3. When I worked on the Lancair project we had a pump, It was quick on small batches but it took a lot of pumping on big ones. And the amount was always a guess. In my shop where I fabricate parts I use a 5lb scale from office Depot (staples) for about 65 bucks and I have no intention to buy a pump, its faster for bigger batches I mostly use and amount is known automatically. You also need a cheap calculator which I set conveniently next to the scale, The measuring process is very simple. Set it on grams, Weigh the precut cloth first (example 300 g) and you will need the same in the weight of the resin. I use Aeropoxy which mixes 100:27 so its 300:1.27= 236 Zero the scale with the cup on it, Put in 236 grams of resin then fill the rest with the hardener to get 300 grams total and you are done. Oh yeah ,and not to forget the best trick to handle the epoxy, transfer it into those laundry detergent plastic bottles with the no drip spouts, works like a charm and you don’t have the epoxy dripping and running down the side. George
  4. http://www.aero-news.net/index.cfm?ContentBlockID=234f6925-a9c6-4a6c-93e0-97dcc7f06308&
  5. Clarification of the black primer coat - In following my method as described on my finishing page, This primer coat is applied in a thin but wet coat to insure it bonds to the surface. The primer does stay on the airplane under the micro so it is not sanded off . This primer coat does not serve as a guide in “spot filling” . In following my method there is no spot filling ( there is only one total fill). The black primer serves as a guide while sanding/contouring the surface. It will give you an indication how much micro is left, the micro is translucent and the black will start showing through progressively turning darker long before you sand through it (see the pictures). Obviously, it needs to be black to give you the highest contrast against the white micro. It needs to be a primer, not a paint. Primers are designed as intermediate coat so they adhere to the surface below and subsequent coat adheres to them , paints will dry with glossy surface and subsequent coats don’t stick well so you don‘t want to be applying micro over paint. As to what kind of primer to use, I would assume any primer designed for automotive or marine applications would do fine. It would be a “non sanding primer, the kind that is used just before the final top coat. I use uspaint AWLGRIP® 545 Epoxy Primer-Base D3001. This primer is dark gray and I add black pigment in to it. Hope this helps Regards, George
  6. It apears the drag area is about 2.2 sq ft I beleiave the thrust would be around 150-160 lb @8000 and about 200 lb @ sea level Legal disclaimer This is only one mans opinion and my contradict with experience and advice of others.
  7. I wrote a page on finishing a composite airplane, Some people facing the task might find it helpful. http://curedcomposites.netfirms.com/finish.html

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