Re: Re: Exact Builder of Model Rule

From: Kevin Lamers <kevin.lamers_at_gmail.com>
Date: Sun, 9 Feb 2014 07:34:17 +0100

My carbon tubes are not overly stiff. Bending stiffness is still mainly
controlled by the bracing. Which could even be ommited for minimal
stiffness. The carbon tube does has superior stiffness in circumfencial
direction though. Other advantages are consistency of the material and
resistance against breaking of motors.
Nevertheless I look forward to see what you come up with. This type of
innovation is what makes this hobby so interesting!

Kevin
Op 9 feb. 2014 06:01 schreef "Nick Ray" <lasray_at_gmail.com>:

>
>
> Carbon tubes were successfully used at the 2012 world champs. I suspect we
> will see some this year as well.
>
>
> On Sat, Feb 8, 2014 at 11:30 PM, Phedon Tsiknopoulos <phedon21t_at_yahoo.com>wrote:
>
>>
>>
>> According to Steve Brown a very stiff tube is worthless because it just
>> does not flex downwards enough in order to give some very much needed down
>> thrust during the initial burst.
>> So carbon is out on all counts!
>>
>> Sent from my iPhone
>>
>> On Feb 8, 2014, at 12:56 PM, Kevin Lamers <kevin.lamers_at_gmail.com> wrote:
>>
>>
>>
>> The weight of 225 mg is for a carbon tube with a length of 10". 9" I can
>> also make at 200 mg.
>> My ID is 4.8mm = 0.2". They are probably stiff/strong enough to use
>> without bracing.
>>
>> OK keep your process secret, but please share the material you used ;-)
>>
>> Kevin
>>
>>
>> 2014-02-08 21:41 GMT+01:00 Phedon Tsiknopoulos <phedon21t_at_yahoo.com>:
>>
>>>
>>>
>>> Carbon is unsuitable for motor tubes.
>>> My tubes have no carbon. Prepreg is too heavy.
>>> My process will remain a secret.
>>> What length are your tubes as you use them for official flights?
>>> I shall be sending Mike Kirda a 9" one in order to test it
>>> Mine are 1/4" I.D.
>>>
>>>
>>>
>>>
>>> Sent from my iPhone
>>>
>>> On Feb 8, 2014, at 11:56 AM, Kevin Lamers <kevin.lamers_at_gmail.com>
>>> wrote:
>>>
>>>
>>> Best wishes,
>>> Kevin
>>>
>>>
>>
>
>
Received on Sat Feb 08 2014 - 22:34:18 CET