2nd test flight Gee Bee with Seidel radial ST 770

Some photo's and video from the second test flight of the 2.5m Gee Bee senior sportster with Seidel ST 770 radial engine.
The first test flight ended with a dead stick outside landing.... (see my other video) this second flight was more succesfull.
Engine running still a little too rich. Needed almost full throttle during the whole flight.

Category:

Autos & Vehicles

Tags:

• 2nd
• test
• flight
• Gee
• Bee
• Seidel
• radial

[Macsgrafs]

is this glow fuel or petrol?

[HansThunderbolt]

@Macsgrafs

This engine runs on glow fuel (5,5% oil + 94,5% methanol)

[jamesjohnoneill]

Hi Hans,

did you need to run a pump, or at least tank pressure, on your engine? Mine will not sustain a nose-up run without tank pressure and even then only just. I'm thinking that I may need to go down a pump, or maybe a pressurised tank and a cline regulator, to get it to run ok.

thanks,

James

[HansThunderbolt]

@jamesjohnoneill

I do not need a pump or pressurised tank. Engine keeps running steady in vertical climbs. But I did use the recommended fuel line diameter (big!) and distance tank to carburator (+/- 7 cm / 3 ").

Normally there is absolutely no need for a pressurised tank with this engine (from what I hear from other users)

[jamesjohnoneill]

Excellent!

What size fuel tank are you using, and how long does it last (with typical flying)?

thanks,

James

[HansThunderbolt]

@jamesjohnoneill ; I'm using a 750 ml fuel tank. A 10 minutes flight will take about 350 to 450 ml

[30inventionman]

@Macsgrafs petrol

[HansThunderbolt]

@jamesjohnoneill

yes this is with the rear mounted collector. See my other video's for an engine run on the test bench also with this collector. I think the sound is much better then without the collector (more "deep" / more realistic) but I lost about 500 rpm from max rpm!

[jamesjohnoneill]

hi,

is this running with the rear mounted collector ring?

sounds great!