Craig good questions, the general idea for best duration indoors is to match
the rubber to the prop, that is, find the prop that will use all of the
turns (or at least 95%) you put in. Or, more commonly, match the rubber
motor to the prop. This is done by stripping various sizes of motors and
trying each, keeping a detailed record of launch torque/turns and height
gained, and number of turns remaining/used. When you land with more than
about 5% of turns you should take an inch or two off the rubber length and
fly again.
Does that help?
My approach to selecting motors is top-down. I simply collect the top
flyers' motor and prop data under various ceiling heights and use them as
baselines. Works pretty well and eliminates a lot of the guesswork. I have
20+ years of flying notes which also helps.
Sounds like your LPP is the classic underpowered case. A 3.1 gram LPP under
a 100 ft ceiling should be able to fly about 10:00 with about .075-.085"
cross section, 18-22" in length. Since yours is overweight you should only
expect about 80% of that duration.
Hangar Rat: I have never flown one but this sounds to me like your prop is
too small or you could go down in cross section, or both. Anytime you dead
stick without very high duration you need a prop/motor adjustment.
Recommend you join the Indoor construction yahoo group for a good Q&A venue.
Lots more experts on there. I am not much of an indoor flyer anymore.
Don DeLoach
Editor, NFFS Free Flight Digest
Freelance Commercial Writer
831 E. Willamette Ave.
Colorado Springs, CO 80903
719.964.7117 voice
<mailto:ddeloach_at_comcast.net> ddeloach_at_comcast.net
_____
From: Craig Greening [mailto:servoframes_at_yahoo.com]
Sent: Sunday, February 20, 2011 1:40 PM
To: Don DeLoach
Subject: indoor
Hi Don,
Do you know anywhere online with tips on rubber sizing? I know I've read it
somewhere but have been looking for hours with no success. Have been flying
a PP and mylar covered Hangar Rat and I know both could/should be doing
better. They are trimmed decently as far as I can tell. The Rat is 5g, and
with 38 inches of .085" deadsticks at about 60 feet after three minutes or
so.
The Pennyplane on a similar motor lands at 4:30 with quite a lot of turns
remaining. It's a little porky at 4.1g but I used the wood that came with it
(Time Machine kit from A2Z). Only gets to 50 feet.
Thanks for any help,
Craig.
Received on Sun Feb 20 2011 - 13:50:09 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET