Composite-ARF Impact question
Bill Southwell
bnbsouthwell at bellsouth.net
Mon Jan 31 19:24:35 AKST 2005
Hi Nat,
My clan's from the sunny state of Florida. I miss the winter flying
weather there! The winters here have been tough to get used to . Of
course this last Hurricane season changed the balance a bit. My wifes
home town ( Punta Gorda) was the land fall and my home town (Arcadia)
was the next stop for Charlie. I guess I can stand some cold weather
after all.
Regards
Bill
Nat Penton wrote:
> 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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