Well that was "fun"

[EricJ]

3 hours ago, Pinecone said:

So the air coming out of the wheel is different from ALL the air around the LG?

Fires can be significantly accelerated with the addition of more oxygen.    Fuse plugs blowing on a main gear tire would add a LOT more oxygen than ambient to a brake fire if they contained air rather than N2.    An inert gas like N2 blowing on it will tend to help blow it out instead.  

[Hank]

2 hours ago, EricJ said:

Fires can be significantly accelerated with the addition of more oxygen.    Fuse plugs blowing on a main gear tire would add a LOT more oxygen than ambient to a brake fire if they contained air rather than N2.    An inert gas like N2 blowing on it will tend to help blow it out instead.  

As tiny as the nose tires are on a Mooney, they will not add a significant amount of oxygen to the fire.

Airliner tires are different--they are several feet tall, contain many cubic feet of gas, and run in the hundreds of pounds per square inch. Mooney nose tires are quite small, maybe two cubic feet of air, and they seem to come in two pressures:  30 psi or 49 psi. Neither will add significant air compared to the airflow at 100 mph.

[EricJ]

35 minutes ago, Hank said:

As tiny as the nose tires are on a Mooney, they will not add a significant amount of oxygen to the fire.

Airliner tires are different--they are several feet tall, contain many cubic feet of gas, and run in the hundreds of pounds per square inch. Mooney nose tires are quite small, maybe two cubic feet of air, and they seem to come in two pressures:  30 psi or 49 psi. Neither will add significant air compared to the airflow at 100 mph.

I agree, there's no reason to run N2 on a Mooney.   Tubed tires don't really support it very well, anyway, and brake fires on Mooneys are probably pretty rare...plus there are no fuse plugs.     

[T. Peterson]

1 hour ago, EricJ said:

I agree, there's no reason to run N2 on a Mooney.   Tubed tires don't really support it very well, anyway, and brake fires on Mooneys are probably pretty rare...plus there are no fuse plugs.     

I would offer that if an owner wants to run N2 in his tires because he just feels better about it and has had a good experience doing so, I will not gainsay his decision.

1 hour ago, EricJ said:

I agree, there's no reason to run N2 on a Mooney.   Tubed tires don't really support it very well, anyway, and brake fires on Mooneys are probably pretty rare...plus there are no fuse plugs.