RE: about bearings
Greg, Bill, BW, Ace,
Writing in this forum does not require a degree in engineering...
I became a dealer for several model product manufacturers, after I began writing in this forum.
Most of them approached me; apparently after seeing that I do have some following...
I learn new things every day and have learned from everything I ever did in the hobby.
I also fully comprehend what I read and can easily sort out important facts, from incorrect assumptions (or utter lies...).
Although I am not a mechanical engineer, I have been deep into R/C and engines since 1980; and began building F/F and C/L planes in 1977.
I also have a profound understanding of anything mechanical and of dynamic systems that involve fluid flow...
...And I have the ability to explain intuitively, in relatively simple sentences and in layman terms; what an engineer will have resort to calculus and complicated formulæ to explain.
Furthermore, my explanations can be understood by anyone who puts his/her mind to them, which is the reason I seem to have some following here.
However, there are also some rather challenging individuals here, who insist on 'ruffling my feathers' (Hey, a monkey has no feathers!...), or just like to argue and to bring out the best in me... I have proven some of them wrong and eradicated some 'myths'; previously believed by hobbyists to be words of G-d...
Regarding the matter in hand, Greg; a seal is something that provides an effective seal...
If it does not provides an effective seal; then it is not a seal; and it must be given another name that would not be synonymous with 'seal'.
I challenge any large bearing manufacturer to explain why his company uses the term 'seal', to describe something that essentially doesn't.