Composite-ARF Impact question

[Nat Penton]

Bill where do you live?  Nat
----- Original Message ----- 
From: "Bill Southwell" <bnbsouthwell at bellsouth.net>
To: <discussion at nsrca.org>
Sent: Monday, January 31, 2005 9:25 PM
Subject: Re: Composite-ARF Impact question


>    Sounds like a twisted stab to me. If it has gotten a bit hot in 
> transit with any torsion it would twist. I have heard stories of fellows 
> leaving the airplane in the van on a hot day and it had something 
> pushing on the fuse.....it cools over night and walaaa  instant flying 
> bannana. It could also be a bad mold but hey, I am sure, as some are to 
> so  eager to point out, that our offshore suppliers are incapable of 
> having a less than perfect quality product. Now if the kit had been 
> produced in the states the warp would have been the first and loudest 
> possibility....Gee, I just slipped my nomex suit on so flame away. :>)  
> My guess is that heat and pressure induced  a ahh ..modification to the 
> fuse and is the source of the off set fin. Besides I doubt the 
> manufacture would miss a chance for a " great new feature" to not have 
> used it in the ad copy if it were intentional..... 
> 
> Bill "call me charcoal now" Southwell
> Iuka,MS
> 
> 
> 
> 
> Adam Quennoz wrote:
> 
>> I've done some more investigating.  I traced the outline of the 
>> airfoil on top of the v. stab on a piece of paper.  It is 
>> symmetrical.   Now the kicker....  I drew a centerline on the top of 
>> the stab.  Then stood behind the plane and sighted down the line I 
>> made.  It pointed WAY off to the left.  So there is definately 
>> something going on with the vertical stab.  I still can't figure out 
>> if it's a design feature or a mistake.  I guess the question to ask is 
>> if anyone out there flying this plane notice any difficulty in 
>> trimming or anything out of the ordinary while trimming?  I'm also 
>> curious what Jason Shulman has to say about this.  Does he know it is 
>> there?
>>
>> Regards,
>> Adam Q
>>
>> Bill Glaze wrote:
>>
>>>
>>> As I recall, this thread started because of one flyer noticing the 
>>> asymmetrical airfoil on his new fuselage. While certainly not 
>>> original in aviation, I must admit that I've not seen this before in 
>>> the modeling world.  Or, probably, it's just that I've not noticed it 
>>> before.  I sure hope he keeps us updated as to how it works in the 
>>> real world of modeling.
>>>
>>> Bill Glaze
>>>
>>> Bob Richards wrote:
>>>
>>>> Bill,
>>>>  
>>>> I don't think it is uncommon for full-scale planes to have offset or 
>>>> asymmetrical fins. However, they are designed with the right amount 
>>>> *for cruise*. Any other speed/power setting will change things. 
>>>> Since they are after the most efficiency in cruise conditions 
>>>> (better range), they will probably want the least amount of offset 
>>>> thrust as possible, and will trim the rudder/fin accordingly. If 
>>>> they expect the fin to be providing a constant yaw force, it would 
>>>> make sense to give it an asymmetrical airfoil for the most 
>>>> efficiency. Let the pilots deal with the other situations.
>>>>  
>>>> I personally think the right-thrust is the correct way to go. I 
>>>> can't argue with what others have said about throttle mix working 
>>>> for them, but I don't see how it would work. I think you will have 
>>>> less slipstream effect happening at full throttle in level flight 
>>>> than you would at full throttle in a climb. As the prop unloads with 
>>>> increasing airspeed, the slipstream effect should decrease.
>>>>  
>>>> Of course, I remember the very detailed trim instructions that came 
>>>> with my Great Planes Cap21. Something like: "Pull the nose up until 
>>>> pefectly vertical. If the plane yaws off to the left, add weight to 
>>>> the right wingtip". There was no mention ANYWHERE about engine 
>>>> thrust. Tossed that in the trash. :-)
>>>>  
>>>> Bob R.
>>>>
>>>> */Bill Glaze <billglaze at triad.rr.com>/* wrote:
>>>>
>>>>     Adam:
>>>>     This may be a little bit off the mark, but just a little bit. 
>>>> During
>>>>     WW2, the Italian firm Fiat produced a very good series of
>>>>     fighters with
>>>>     exactly the characteristics you mention, that is, an asymmetrical
>>>>     fin/rudder airfoil. Seemed to work well for them; other nations
>>>>     handled
>>>>     the problem differently.
>>>>     Bill Glaze
>>>>
>>>>
>>>>
>>>> Bob Richards
>>>> bob at toprudder.com
>>>> http://www.toprudder.com 
>>>
>>>
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