Without going into a several page analysis, the simple explanation is that in a high ceiling you can spend more time in the descent so you can use up turns that don't have enough remaining torque to keep the model in the cruise phase (where you're theoretically not changing altitude). At USIC you have over 100' to descend. At a Cat 1 gym you only have 20' or so.
The easy way to tell if a heavier motor is better is to try it. Another way is count how many turns are remaining in the model when it lands. In a low ceiling you will probably always have turns remaining, but too many isn't good. How many is too many? I don't have the answer to that. Just keep in mind that the longest flight time wins - not the person who started out with the most turns in his motor.
John Kagan once shared a rule of thumb that will get you in the right ballpark:
The number of turns remaining should be approximately equal to the number of turns you back off from a full wind.
----- Original Message -----
From: matthew taudevin
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, July 30, 2008 6:34 PM
Subject: Re: [Indoor_Construction] A6 for a dummy
really? with i would of thought the reverse. but i do not know much about it?
regards
Matthew
----- Original Message ----
From: Bill Gowen <b.gowen_at_comcast.net>
To: Indoor_Construction_at_yahoogroups.com
Sent: Thursday, 31 July, 2008 8:15:38 AM
Subject: Re: [Indoor_Construction] A6 for a dummy
Lower ceilings generally require thicker rubber.
----- Original Message -----
From: matthew taudevin
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, July 30, 2008 6:09 PM
Subject: Re: [Indoor_Construction] A6 for a dummy
I agree with your thoughts on design modification. I have a little experinence with scale models so increasing the fin size is somthing that i almost do by default. I will try .034 (.86mm) The gym that i fly in is quite tall but it is not like the kibbie dome or anything like that. I do no think that there is anything like that in Australia?? here is a video of one of my freinds EZB flying in the gym in question.
http://www.youtube.com/watch?v=qZkPknE5yP0
regards
Matthew
----- Original Message ----
From: "Warthodson_at_aol.com" <Warthodson_at_aol.com>
To: Indoor_Construction_at_yahoogroups.com
Sent: Thursday, 31 July, 2008 12:05:40 AM
Subject: Re: [Indoor_Construction] A6 for a dummy
I am not familiar with that particular plan. However, based on my
experience, I think you are on the right track with the information below. Two
comments. I doubt that you need to increase the rudder area, but doing so won't hurt
either. I think the 0.030" rubber will prove to be too small. If you are
flying in a typical gym, I would use a 13"-15" loop of 0.034" rubber. The thicker
rubber will improve the cruise portion of the flight. If you are not happy
with the results, look around for a proven design & build it exactly as shown.
Don't try to improve it until you have a good base line of experience with
the proven design.
Gary Hodson
In a message dated 7/28/2008 12:40:38 A.M. Central Daylight Time,
mattnsim_at_yahoo.com.au writes:
Hi there all, I am looking for some expert guidance on a beginers level
A6. I am not new to free flight, but am i new to A6. I have built lots
of peanuts and have actually won an Indoor peanut scale contest. I made
an A6-5a by bruce mcrory. I did enlarge the rudder,The plan indicated
that the rudder had been reduced in size as a test to see how it went.
I did not need that agrivation to start out with so i increased the
rudder by about 15%. The models all up weight is 1.2 grams. It is
covered in pre shrunk condensor paper and i am looking for some expert
advice on trimming. My prop blades are set at 45 degrees to one another
and i have used a twisted wire pigtail prop hangar.
I plan on using .030 rubber to start with as per the plan and we will
see how i go from there. If there is anyone out there with some tips
that would be greatly appreciated.
regards
Matthew
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Received on Wed Jul 30 2008 - 16:47:16 CEST