seravios

i feel a mesh would do fine cosmetically. In terms of providing fine particles protection,it is futile. Leaving it open would provide better cooling. I did not cut open the air intake on the sides of the vortex for fear of particles ingestion. So i depends on this opening for air.

seravios

Jason, if u look carefully on the first pic, I have installed a brake for this jet

menzapsi

So today I went to the field to try my JUNIOR. The first flight went well. On the second one the JUNIOR flameout at takeoff. After cooling I tried to start and when I reach 60.000 RPM, I have HIGH TEMP on the display also I felt that something was vibrating. In the visual examination I found the turbine nut like you can see on the photo.

jason

My Feedback: (1)

The Jetjoe company is not known for their careful selection of materials. I think your nut was machined from a piece of cheese. looks like you need to send it back to china.


Jason

seravios

wow....... luckily the turbine wheel didnt fly out

Woketman

My Feedback: (6)

Well, give Joe some credit. Perhaps he actually used a soft aluminum!!!

seravios

I feel the nut can easily be replaced locally. Sending it back to china, u might get the same quality nut be installed,and u are back to square one.

Xairflyer

My Feedback: (1)

We call materials that come from China "Cheeseim"

littlepiston

My Feedback: (12)

SOB i would hate to get the 3700 koli, Some one fix this little turbine

sidgates

My Feedback: (2)

Please keep us posted on your progress with your Micro engine.

seravios

menzapsi, how is your engine?

menzapsi

I am waiting the nut from Joe. When I receive it, I will take out the wrong one and try to fix and test the Junior.

idleup1

check yor exaust temp and open your tail pipe to drop temp to <700 . mine ran 850 now it runs 680. The nut should be 316SS.

figueroa

My Feedback: (22)

WOW !
That's an odd looking nut.
I looks like the nut is made of lead, you are lucky it stayed on.

Woketman

My Feedback: (6)

Jet Joe quality at its finest!

j.duncker

My Feedback: (2)

That is one scary picture. It is testament to the forces these little jets generate at max rpm.

Is it a heat related failure? Or has the material just had it's elastic limit exceeded?

This has hit my curiosity button. I want to know why it has failed like that. [ And can only have been a few seconds at most from total failure. ]

In my time as an engineer I have seen a number of stretched bolts but never a nut.

erazz

The only way this could have happened is with a very high heat and a very cheap steel for the bolt. (I really hope they didn't make it from alu)
This should be a warning to other JJ owners. Poor materials will bite you where you least expect it. If that wheel would have come loose the result could have been horrific. The energy pent up in there is amazing. It could have easily gone through a car door let alone a hand or foot.

Kometfreak

Hope they get it right before they start making full scale airliners.

SJN

Have you guys seen this Fly Fly MB339 with the kolibri.
http://www.youtube.com/watch?v=ZD-AwbzfzaM

I bet the JJJ will fly it about the same way.
Would be nice if you could use all the FlyFly airframes for these smalle jets.

2walla

My Feedback: (10)

For you US guys, where have you been buying your JJ turbines? Have you been buying them direct from china or from JJ central? What about JJ usa LLC?

2walla

My Feedback: (10)

How many of these are actually out there that are running ok? Anyone???

littlepiston

My Feedback: (12)

I would also like to know how these have been running.

2walla

My Feedback: (10)

Anyone?? Doesn't look like there are any out there?

seravios

I feel there are lots of issue concerning material quality now.

menzapsi

My junior is back from china.
Joe have change the compressor, the shaft, the nuts, the bearing and the exhaust cone.
I will test flight it on sunday.