jbeech
rrAdvertiser
Location: Sanford, FL (Orlando area)
| Marty,
We recommend running 620mm blades. It's been our experience with 640mm blades (so far) that they're not that great. Frankly, I don't know if it's an issue with the particular blade airfoil, or what. Conversely, the various 620mm blades all seem to work well. Naturally, if you're game, go ahead and try 640mm blades for yourself and tell us what you learn - interested minds always want to know another's opinion!
Engine wise, folks can always run a 90 if they like, but without the Stage 2 gear set I rather doubt they'll like it for 3D work (though sport use and scale works rather nicely). Regardless, I seriously doubt folks will be able to get themselves in trouble simply because the engine won't turn fast enough to reach its sweet spot powerwise and hence, this is a non-issue because tyhe 91 isn't optimized for the present gearing but using one won't hurt anything.
Here's the deal. The BBC conversion is perfect for folks with a 61 laying around (and I've seen 61SX-WC engines going for 35-50 bucks here on RR, and some included a muffler), and/or for those wanting to overcome the issue of reduced horsepower resulting from high density altitude. In my opinion, if you're buying a new engine for the conversion, an OS Max 70 is a "very" nice choice, i.e. easy to tune, it makes plenty of power, and it results in loads of fun because it'll climb so strongly you can race bottle rockets! It's a giggle maker, if you catch my drift. Everybody at the field will say, wow!
Finally, with respect to the engine nut; back in February you were amongst a very select group of people who received a BBC kit. Why didn't I release them widely? Precisely because I wanted to see what I could learn from folks like you. Hence, I very carefully sought to place them in an effort to discover what the user experience would be. Naturally, the participants were, as is my norm, selected largely because of their differing levels of experience. I.e. we sought to see what folks with experience ranging from rank beginners through experts modelers would have to say to see what problems, if any, they encountered. However, what I have in stock now are final production parts, i.e. CNCed to a very high quality level, which are nigh near perfect, so again, this is a non-issue.
Regards,
John Beech - GM (and janitor)
Audacity Models |
