That's roughly the cross section Kagan uses, I believe. For my 19.2" prop, an 8-8.25" motor would seem about right. I believe an 17.5 to 18.0" prop is right for Cat I.
I used a 8.8" motor for the Luther Burbank site in September, but the temperature inside was at least 90, if not 100. In a normal situation, an 8.8" motor would be too feeble to power an 19.2".
--- In Indoor_Construction_at_yahoogroups.com, joshuawfinn@... wrote:
>
> Kang,
>
> I haven't had much success with the 19-19.5" props I was trying for a while. This one is 18". Still a lot of bugs to work out. All flights were on 1100-1150 turns, 7.5" motors, hence the low rpms.
>
> Launching at anything in the range of .7 in-oz is scary, and the model usually looks quite pitiful for the first 90 seconds. Then again, Hope's was climbing like crazy while in a right bank and left turn...
>
> -Joshua Finn
>
>
> --- In Indoor_Construction_at_yahoogroups.com, "Yuan Kang Lee" wrote:
> >
> > Yes, why is Nick's big head preventing me from counting the RPM?!
> >
> > Josh, your model looks great, both in high pitch and low. Is that prop shorter than 19"? What cross section / length motor are you using?
> >
> > Nick, that is a pretty crazy climb. What kind of prop and motor were you using? Are you practicing for Slanic?
> >
> > --- In Indoor_Construction_at_yahoogroups.com, joshuawfinn@ wrote:
> > >
> > >
> > >
> > > --- In Indoor_Construction_at_yahoogroups.com, "Yuan Kang Lee" wrote:
> > > >
> > > >
> > > > Why me, Josh :) ?
> > > >
> > >
> > >
> > > Well I just got the impression that you do that. I do my share of clocking rpm's when watching videos of various F1D's.
> > >
> >
>
Received on Tue Feb 12 2013 - 09:17:59 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:47 CET