Classic Model 4 1200 vs Model 5

[Esser]

I am at the forward limit of my C of G when solo on my Model 7 with a 914 and a constant speed prop. I also have an intercooler which the 914 pretty much NEEDS I don't think on a model IV there is much room to have a straight forward intercooler install.

[Av8r3400]

Josh - I'll show you the weight and balance on the Mangy some time...

[av8rps]

The Model 4 is easier to balance with extra forward engine weight because the nose is so much shorter than later models that have the longer nose. In fact, a little more weight forward on a typical Model 4 would be a good thing.

[HighWing]

When building my second Model IV, I moved the 912 a bit forward with a new engine mount to help recover some of the baggage sack capacity I lost in the first one when I put all the fairings and gap seals in the empennage. When weighing for CG, I discovered I was very close to the forward limit. Thinking about it, I remembered when I was working at United Airlines on the ramp. This was shortly after the Arab Oil Embargo. It was determined then that Max fuel efficiency was flying with CG at close to the aft limit. Very often all luggage was loaded in the aft pit. And if not full, passengers were spaced to achieve an aft CG. I decided to put 5 lbs of lead in the tail pending a tailwheel upgrade. CG still a bit forward, but hopefully a flatter elevator and a bit more speed and efficiency - assuming a Kitfox is at least a tiny bit similar to a 747.