knighttwister

My Feedback: (59)

i just bought a Great Planes F4 Phantom kit and was looking at the Jett line of engines. which would be the best engine in this line for the F-4?
kind regards,
JIM

bob27s

My Feedback: (19)

Hi Jim.....

A few F-4 Phantoms flying out there with Jett power

Best engine suggestion is the "standard" version SJ-90L.

Sames "61" size engine block - similar to the OS 61/91 in size and mounting.

It is a big, draggy plane - and although quick, it will not let a 90LX version engine really unwind where it likes to.

SJ-90L, 12x6 APC. And you will be good to go

Bob

knighttwister

My Feedback: (59)

thanks for the fast reply.
what sort of speed can i expect with the 90L? i;m thinking about 70 mph. is this about right?
thanks again for the help .

bob27s

My Feedback: (19)

If you are looking to hit 70mph...... I am pretty sure you will not be disappointed

Once the gear is up on the phantom it is fairly quick.

Just as a reference, this video is an AKModels SU-27 with 90L power. It is about the same size, maybe a little bit lighter, but it has about the same frontal cross section area (drag from the hole it much punch in the air). [link=http://www.jettengineering.com/video/su27baker.wmv]Rich Baker video[/link]

There are a few other projects for reference on here too: http://www.jettengineering.com/hall/hall-propjets.html

Always happy to be of help

Bob