Composite-ARF Impact question

Mon Jan 31 17:07:36 AKST 2005

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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