Don
That 12500 cst oil seems pretty thick for an indoor model. I looked at a chart referenced below from Machinery Lubrication magazine which has 200 cst at 40 C pegged to SAE50 crankcase oil. I realize the log scale of viscosity, but you seem to be talking gear lube here.
http://media.noria.com/sites/archive_images/Backup_200107_viscosity_table_2.gif
At FAI supply, there are 2 grades of Sil-Slick, one for big models and a lower viscosity one for small models, listed. Unfortunately there's no viscosity spec mentioned for either one. Both come in bottles with dropper tops, so they can't be that viscous. There's also Glycerine and liquid soap, which looks like the old timey Sig rubber lube I use.
Do you have a Dow-Corning number for your oil? How do you apply it? Smear it on with a q-tip? Disperse it in a solvent?
Do you clean it off between flying sessions, or just mop off the excess?
I'm a retired chemist, so I know you want to use the best stuff you can. There's a lot out there, and we need as specific information as we can get.
Joe
--- In Indoor_Construction_at_yahoogroups.com, Don DeLoach <ddeloach@...> wrote:
>
> The lube of choice in F1G and F1B these days is pure silicone oil, 12,500cst
>
> Don DeLoach
>
> Sent from my iPhone
>
> On Nov 8, 2012, at 12:40 PM, "John Berryman" <wordguy1950_at_...> wrote:
>
> > Don’t know how many other cheapskates there are out there, but I’d be interested in seeing a comparison of “real†rubber lube to some of the “just as good â€" no kidding†materials that I hear about from time to time, e.g.,. Armorall and its various clones, etc.
> >
> >
> >
> > I used to fly OD FF with a wake flyer who did a lot of testing so I have the sense that you’re embarking on quite a journey and may find that a study of alternate lubes may simply insert too many variables into the equation given the amount of time you have available to you.
> >
> >
> >
> >
> >
> >
> >
> > From: Indoor_Construction_at_yahoogroups.com [mailto:Indoor_Construction_at_yahoogroups.com] On Behalf Of mkirda@...
> > Sent: Thursday, November 08, 2012 12:31 PM
> > To: Indoor_Construction_at_yahoogroups.com
> > Subject: [Indoor_Construction] Rubber testing
> >
> >
> >
> >
> >
> > Greetings.
> >
> > It was suggested to me that I produce torque curves for the various batches of rubber I have available to me.
> >
> > I am not really finding anything to guide me on doing this. Making this up as I type...
> >
> > I assume that I should standardize on a given loop size and cross-section. I'll likely use something similar to F1D motors, so .6 grams, ~0.053" width. Make up several of each rubber type.
> >
> > Use the digital torque meter and a bracket for the winder so the rubber length is consistent. 10" from hook to hook is about correct.
> >
> > Stretch 5x for 5 minutes, let relax a bit, then wind to breakage for max torque and turns.
> >
> > Wind to 70%, let sit for a couple minutes, then back off and rest for ten minutes.
> >
> > Wind to .5 oz/in or so(90%?), then back off 30 turns and record the torque measurements.
> >
> > I currently use the FAI Sil-slick lube. Should I try others?
> >
> > Regards.
> > Mike Kirda
> >
> >
> >
>
Received on Thu Nov 08 2012 - 18:09:51 CET
