Throt/ Rud

[Mike Hester]

So it's becoming more pronounced now that we're flying slower, with larger 
props and more thrust? Makes sense to me. I'm noticing the yaw on pushes 
myself, but I haven't tried mixing throttle to rudder yet, I've just been 
subconsciously feeding the rudder and not thinking about it. I think I'll 
try that mix tomorrow and see what happens. It's definitely worth a try no?

5 degrees is definitely excessive. I got to 3 1/2 myself and decided 
something more was needed. I also noticed when I ran a smaller diameter prop 
less side thrust was needed. up/down was unchanged. But from 16 to 17.5 
there is a noticable yaw difference. But I LOVE the vertical!

Well gents it's the perfect time of year to experiment and see what works 
for us all. My guess is somewhere in the middle of 0 and 5 with a bit of mix 
to the throttle. Hehe.

-Mike

----- Original Message ----- 
From: "Jim Ivey" <jivey61 at bellsouth.net>
To: <discussion at nsrca.org>
Sent: Wednesday, January 26, 2005 11:06 PM
Subject: Re: Re: Throt/ Rud


> Guys
> In this months Model Aviation (page98)Radio Control Scale Aerobatics, 
> Peter Goldsmith has a informative article about trimming a plane and 
> thrust. He explains that the thrust angle needed is  dependant on the 
> airspeed and that there is a range of flight parameters that only relate 
> to our needs so far as trimming is concerned.He has some excellant ideas 
> here that may further tell us what we need to know, with respect to 
> trimming thrust line and rudder trim.
> It's obvious that Chips ideas work for him and Peters ideas work for him.
> Grab your AMA mag. and read.
>
> Jim Ivey
>>
>> From: "Ed Hartley" <roho2 at rcpattern.com>
>> Date: 2005/01/26 Wed PM 10:34:52 EST
>> To: <discussion at nsrca.org>
>> Subject: Re: Throt/ Rud
>>
>> Think about having the trim and thrust where you don't have to do 
>> either?????
>>
>> Ed
>>
>>   ----- Original Message ----- 
>>   From: John Pavlick
>>   To: discussion at nsrca.org
>>   Sent: Wednesday, January 26, 2005 10:13 PM
>>   Subject: RE: Throt/ Rud
>>
>>
>>   Ed,
>>    Don't think about inverted / upright / right / left like that. It's 
>> all the same to the airplane. Upright the slip stream hits the left side 
>> of the fin causing Left yaw. For sake of argument: Right thrust will be 
>> used to counteract this. Inverted, the SAME THING happens. Don't think 
>> right / left in reference to YOU, think left / right in reference to the 
>> AIRPLANE. When inverted the slip stream hits the left side (still) of the 
>> fin - unless the motor suddenly starts turning the opposite way. Same 
>> thrust offset ("Right") required unless the slip stream goes away in a 
>> push. Now if there's right thrust, you need left rudder to offset the 
>> right thrust which is trying to make the airplane yaw right in the 
>> absence of the slip stream air on the fin. If you still want to think 
>> about it the "other" way, remember "left" rudder when inverted will make 
>> the plane yaw to the "right" (in reference to YOU standing there watching 
>> the plane). Now I'm getting confused.
>>    If you think about what Chip described: Trim for straight flight at 
>> full throttle, mix left at idle. Another way would be trim straight at 
>> idle, mix right at full throttle. That's what I've been doing. Same 
>> difference.
>>   John Pavlick
>>   http://www.idseng.com
>>
>>
>>     -----Original Message-----
>>     From: discussion-request at nsrca.org 
>> [mailto:discussion-request at nsrca.org]On Behalf Of Edward Skorepa
>>     Sent: Wednesday, January 26, 2005 8:15 PM
>>     To: discussion at nsrca.org
>>     Subject: Re: Throt/ Rud
>>
>>
>>     I'm confused too. I know, I know I shouldn't argue with someone like 
>> chip but I believe the main reason we're putting right thrust is an 
>> asymmetric vertical fin. On most conventional airplanes the area above 
>> thrust line is much greater then area below. So, the spiraling slip 
>> stream  will hit the top portion of the vertical fin from the left 
>> pushing tail to the right thus right thrust. When inverted, the spiraling 
>> slip stream will hit vertical fin from the right because fin is now on 
>> the opposite side and  pushes tail to the left. To straighten the flight 
>> path, we need now the left thrust which is already there. During inverted 
>> push ups, why do we need to use left rudder? The spiraling slip stream 
>> misses completely vertical fin and the right (left when inverted) thrust 
>> is causing airplane to yaw left. If you have a big gasser, turn on smoke, 
>> do inverted push up and watch where the smoke goes. However, Chip's 
>> approach of fixing the inverted push ups problem is quite interesting and 
>> I'll try it on my new bird I'm working on right now.
>>     ed
>>       ----- Original Message ----- 
>>       From: Nat Penton
>>       To: discussion at nsrca.org
>>       Sent: Wednesday, January 26, 2005 11:32 AM
>>       Subject: Throt/ Rud
>>
>>
>>       Cameron Smith relayed comments from Chip ( from RCU ) relating to 
>> how he uses a mix to eliminate the need for right thrust. I know Chip 
>> knows but he left me confused. Could someone clarify what he said?
>>
>>
>> --------------------------------------------------------------------------
>>
>>
>>       Internal Virus Database is out-of-date.
>>       Checked by AVG Anti-Virus.
>>       Version: 7.0.300 / Virus Database: 265.7.0 - Release Date: 
>> 1/17/2005
>>
>>
>
>
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