Aux tanks on a M20J-MSE

[Aerophile]

I recently partnered up with a guy who owns an M20J-MSE and have been doing some instruction in it. The airplane is equipped with gravity fed aux tanks. Now, the placards on the airplane say that each aux tank has a 14.5 gallon capacity. The supplement says that the aux tanks add 34 gallons total, but it goes on to say that each tank has a 14.5 gallon capacity. So my question is, where is the extra 5 gallons?

[philipneeper]

It doesn't count in the total unusable fuel does it?

[M20F-1968]

The MSE most likely has speed brakes.  If so, that reduces the aux tanks by 5 gallons total making 14.5 gallons a side.  There is also 1/2 gallon of unusable fuel per side.

 

John Breda

[201er]

10 extra gallons of fuel sure are more useful than speed brakes 0:-)

[ArtVandelay]

10 extra gallons of fuel sure are more useful than speed brakes 0:-)

We're talking about 93 gal vs 103 gal, that's like 9hr vs 10 hrs flight time.

You have to be crazy to spend 9 hrs in a small plane let alone 10

[Marauder]

We're talking about 93 gal vs 103 gal, that's like 9hr vs 10 hrs flight time.

You have to be crazy to spend 9 hrs in a small plane let alone 10

I will have you know, the post above yours is from his sire, none other than Mr. Stinky Pants himself. He has been known to have spent 11 hours in the left seat of Mooney non stop.

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[Marauder]

And he has the body odor to prove it...

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[carusoam]

Why not ask José...

Best regards,

-a-

[Piloto]

John is right. If the plane has speed brakes the capacity is reduced by 5 gallons total. If you refill the aux tanks next day you can add up to 5 gallons total. This is due to the aux tanks filling the airspace in the mains overnight. Don't forget your P-bottle.

 

José 

[rbridges]

And he has the body odor to prove it...

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I could smell it in Georgia when he was overflying towards the gulf.  

[Aerophile]

Ok that makes a lot of sense. Yes the airplane does have speed brakes. Thanks for your help.

The next question I have is how much horsepower does Firewall Forwards Horsepower Plus STC add to the 200 HP IO-360? I have found literature in the supplements but none of it comes out and says how much horsepower it has with the larger cylinders. Firewall Forward's websites doesn't help much either.

[aaronk25]

Might want to google that shop, lot of upset customers.