[NSRCA-discussion] gassers

[Randall Bearden]

On 9/6/07 12:57 PM, "Bob Richards" <bob at toprudder.com> wrote:

> I would love it if a good gas engine option existed for pattern. Even with the
> additional ignition module, I have had far more reliable running with my gas
> engines than I had with glow. If a glow motor does not have the mixture just
> right, it can deadstick. With gas/ignition, it just doesn't run quite as well.
> And the price of fuel is no comparison.
>   
>  
>   
> Soft mounting with headers/pipes could be an issue (hotter exhaust), but
> probably not much more than glow.
>   
>  
>   
> 20 years ago I would have been itching to try something like this, but I'm
> just not willing at this point to put the time into figuring all this stuff
> out. I'd rather let someone else work out the kinks. :-)  Also, electrics are
> just too easy, although expensive initially.
>   
>  
>   
> Bob R.
>   
> 
> 
> vicenterc at comcast.net wrote:
>   
>>   
>> I helped to build the Abbra gas for a friend.  We used the ZDZ 40 (non F3A
>> version) hard mounted initially but after fluttering one aileron it was
>> decided to install a custom made soft mount. The plane was 11 lbs 5-6 oz.
>> The Abbra is very light airframe and we could not make the 11 lbs.
>> Therefore, meeting weight is probably your first issue.  Second issue is
>> noise.  I think we were OK using the soft mount and the ES pipe header for
>> gas engines.  However, I never had chance to measure noise levels.
>>   
>>  
>>   
>>  I flew the plane 3-4 times and it was evident that the power was was limited
>> compared with the Abbra  glow version in doing the old Master schedule.  I
>> believe that prop selection could be part of the problem but never had chance
>> to try other props.  I think that gas is a good option in the lower classes.
>> Base on this single experience, it could be a problem for Master or F3A.
>>   
>>  
>>   
>> --
>> Vicente "Vince" Bortone
>>   
>>  
>>   
>>> -------------- Original message --------------
>>> From: "Bob Wilson" <wilsorc at gmail.com>
>>>   
>>> Probably a stupid question, but has anyone had any success running gas
>>> engines in pattern ships?  The Brison 2.4 and 3.2 are real powerhouses for
>>> example.
>>>   
>>>  
>>>   
>>> Bob
>> From: "Bob Wilson" <wilsorc at gmail.com>
>> To: NSRCA-discussion at lists.nsrca.org
>> Subject: [NSRCA-discussion] gassers
>> Date: Thu, 6 Sep 2007 16:03:10 +0000
>> 
>> I have seen a Black Magic with an Evolution 26GT2 with a header and pipe.
>> 10oz gas tank and flew for +15 minutes.  No problem with power, 8500 rpm
>> turning a 18X6 APC prop. Under 11lbs wet.
>> 
>> Randall Bearden
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> 
> 
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