Hi Jeff

That is exactly the point I was aiming to yesterday.  The addition of a 
single pound in the tail would require perhaps five times more in the 
nose due to the differences in distance from the CG to the tail than the 
the distance from CG to the nose.  It is quite likely the balance weight 
on the elevator is good to have but unnecessary for the KR-2 since much 
of it's top speeds have shown that most of the KR-2 have exhibited 
little or no concern.

Adrian Carter and I were both building our own KR-2 at the same time in 
Calgary and we were always concerned with how to keep our projects 
light.  That needs to remain the principle target with the KR-2.  I am 
getting close to finishing my plane many years after Adrian's.  I 
haven't commented on anything over the years but perhaps I should rather 
than just reading.

Thank you
Ken R Nathan  KR-2  C-FKRN

On 5/11/2015 11:34 PM, Jeff Scott via KRnet wrote:
> Hi John,
>
> You are correct in that the fuselage was extended to address elevator 
> sensitivity and the firewall moved forward to move the engine forward to make 
> the plane easier to balance.  Sid just stated it a different way by saying 
> the wing was moved back by 2".  Either statement is correct.  I don't think 
> the CG envelope changed at all between the 2 and 2S as far as CG range 
> relative to the wing cord.
>
> I don't know why Sid's plane is so terribly tail heavy, but adding a ton of 
> weight to it isn't the way I would go about fixing it.  As someone pointed 
> out, he has balance weights on the elevator.  Those are really unnecessary on 
> the KRs.  I'd lose those in a heartbeat.  When I rebuilt the tail on mine to 
> a much larger elevator and stab, I designed it to accommodate a set of 
> balance weights, but when it came down to it, I couldn't convince myself to 
> add 4# of lead to the tail.
>
> Sid seems determined to fly his plane as equipped.  That seems fool hardy to 
> me and others have implied the same on the net.  Hopefully he won't hurt 
> himself in it.
>
> Best regards,
>
> -Jeff
>
>
>
>> Hi Jeff
>>
>> I thought the -2S had the rear fuselage extended to reduce elevator
>> sensitivity and had the firewall moved forward to compensate by altering the
>> engine mount position. I can well understand then why you correctly needed
>> to add weight up front in various ways without building the firewall
>> extension. I wasn't aware that RR changed the CoG envelopes as well to
>> reflect any changes to wing position.
>>
>> I sincerely hope Sid has a successful flight but I don't understand his
>> reluctance to get his conclusions verified by a professional given the
>> stakes. To me it's a no brainer given the magnitude of the weights
>> apparently needed.
>>
>> Regards John
>>
>>
>> John Martindale
>> 29 Jane Circuit
>> Toormina NSW 2452
>> Australia
>>   
>> ph:61 2 6658 4767
>> m:0403 432179
>> email:john_martindale at bigpond.com
>> web site:
>>
>> -----Original Message-----
>> From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Jeff Scott
>> via KRnet
>> Sent: Tuesday, 12 May 2015 4:03 AM
>> To: krnet at list.krnet.org
>> Cc: Jeff Scott
>> Subject: Re: KR> Ballast weight installation
>>
>> Sid brings up a good point here, especially for builders that are early on
>> in their projects......snip
>>
>>
>>
>> -----
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>>
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