Composite-ARF Impact question

Nat Penton natpenton at centurytel.net
Mon Jan 31 18:46:38 AKST 2005 

Bill,
I graduated from the Univ of Tx in 1950 (yegods) with a good friend, Bill 
Southwell, from San Antonio. Thought you might be related.
I have had enough of this weather. Can remember one year I flew 20 plus days 
in Jan in shirt sleeves!
                                         Best Regards     Nat
----- Original Message ----- 
From: "Bill Southwell" <bnbsouthwell at bellsouth.net>
To: <discussion at nsrca.org>
Sent: Monday, January 31, 2005 10:07 PM
Subject: Re: Composite-ARF Impact question


> Hi Nat,
>
> I live in the nort east corner of Mississippi. The town is named Iuka. 
> Pronounced" eye-U-Ka".   It is supposed to be an Indian chiefs name but 
> after living here for four years I think the locals made it up and 
> couldn't spell to boot!  :>)
>
> Regards
> Bill
> Iuka, MS
>
>
>
>
>
> Nat Penton wrote:
>
>> 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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>
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>>
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