REFLECTOR: Roll trim mod suggestions

[David Rene Dugas]

The hive made comments as requested.  I'm sure your mods will work great. Good luck. 

René Dugas
Apple the REALLY smart phone. 

> On Dec 15, 2013, at 10:51 AM, Don Johnston <numa at comcast.net> wrote:
> 
> That would require a definition of "broke" and "fix".  ;-)
> 
> For example:
> 
> The belleville washers on the nose gear have been in use for many years. That would indicate it ain't broke. Yet Velocity has been working on a shimmy damper. 
> 
> An additional hydraulic cylinder to close the nose gear doors has been in the manual since the retract has been offered. Yet many people have gone with a mechanical mechanism. 
> 
> Airplanes has been flying on steam gauges for about 100 years. So that clearly ain't broke. But Just about every new plane being built today has a glass panel. 
> 
> And don't get me started on engines. :-)
> 
> As for me and the roll trim, one of the things I kept seeing were comments about the roll trim slipping and how belt dressing, extra turns of the cord, fairy dust and other approaches would "fix" it. That to me, indicated a potential for improvement. Unfortunately, I belatedly realized that since the motor has continuous rotation there there has to be some slippage. So now I have the timing belt parts installed and this looks like a solution that will provide positive motion and allow the belt to slip should the travel exceed the allowable limits. 
> 
> The point is that most of us have undertaken our projects because we are comfortable with making (what we think are) improvements to the "book" design. Some, more than others.
> 
> Stepping down off the soapbox now. 
> Don
> 
>> On Sun, Dec 15, 2013 at 6:03 AM, Carl Hoffman <hoffman3 at rcn.com> wrote:
>> What ever happen to; "If it ain't broke why fix it?"
>> 
>> 
>> Sent from my iPad.
>> 
>> 
>>> On Dec 14, 2013, at 11:14 PM, Rene Dugas <renedugas at gmail.com> wrote:
>>> 
>>> Jorge monitors the reflector.  
>>> Comment:  Roll trombone from the factory works.  Mine slipped a little when new but one additional wrap of the cord and some polishing compound on the cord for grip fixed it.  There are so many other places one can tweek the plane with less risk. Modifying controls is a slippery slope.
>>> 680 hrs flying 10.5 yrs. trim with No maintenance.  KISS.
>>> YMMV.
>>> 
>>> Sent from Rene's iPad. A pleasure.  Go Apple.
>>> 
>>> 
>>>> On Dec 12, 2013, at 10:49 AM, Brian Michalk <michalk at awpi.com> wrote:
>>>> 
>>>> Also, someone asked about an aerodynamic trim.
>>>> 
>>>> Jorge Bujanda was working on such a beast, if I recall.  Does anyone know how that worked out?
>>>> 
>>>>> On 12/12/2013 10:06 AM, Ron N VelocityXLFG wrote:
>>>>> Got my belt and pulleys here
>>>>> 
>>>>> http://www.mcmaster.com/#timing-belt-pulleys/=prz4ya
>>>>> 
>>>>> 
>>>>> 
>>>>>> On 12/11/2013 5:27 PM, Don Johnston wrote:
>>>>>> Thanks for the replies!
>>>>>> 
>>>>>> I thought about a limiting cable that would prevent the motor from rotating.  But making sure it was strong enough and making sure it didn't cause a problem in "slack" mode was problematic. 
>>>>>> 
>>>>>> The clutch is an interesting approach. But the cost and               space made that a non-starter. 
>>>>>> 
>>>>>> So I've removed the parts and ordered the smallest timing pulley I could find with a .25" bore.  I'll open it to 5/16" and try that. The nice thing about the timing belt is that you can control how much slippage is allowed with spring tension. 
>>>>>> 
>>>>>> Thanks again,
>>>>>> Don
> 
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