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Pusher Park Jets For all pusher jets and jet-like models.

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Old 06-15-2014, 03:43 PM   #651
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Originally Posted by dahawk View Post
Thanks Nigel,

Yes, I hear differing opinions all over the place. Your 6X makes the most sense. One guy had told me 2X the model weight was the "rule of thumb" --Not.

I think I can modify the connectors as you suggested in order to eliminate the bump. The Jetapult™ must be less than 1/2 the ramp length you're showing. Mine is only about 26" (660mm) in overall length. Did not seem like I need a long ramp length anyway. Worked fine once I got the tension dialed in and placed a small 2" brick under the front.

One thing I have done for my heavier rail structure ... the picture I posted earlier is 1/2" pipe ... my heavier is 3/4" .... The T connector - I have cut away the upper inner side of the T and the rail is held by self-tapping screw through outside part into rail. This then stops any contact with part of my F16 .. Twister that sits down into the rails ...

I was finding that the ridge caught the aileron servo a couple of times and on one launch caused the servo to rip out ...

https://www.youtube.com/watch?v=zLnclmDh8eo

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Old 06-15-2014, 04:44 PM   #652
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Good idea Nigel. This one is also 3/4 in. pipe. I think I may be able to trim back the inside ridge a bit with a Dremel but like you mentioned may need add a screw from the bottom or outside of the connector.

Frankly, it's such a short rail and because things happen so fast, I didn't really notice it catching. Looked on the underside and could not detect any scrape marks. So maybe I got lucky. Funny to watch the little Goshawk take off from the bounce like a touch 'n go.
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Old 06-15-2014, 08:36 PM   #653
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i am taking away the pipe insulation and am sanding down the top of the corner connector so the launch will be smooth with no bumps. also i think my angle and height could be reduced. not to much.

narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 10-19-2014, 02:51 AM   #654
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For those interested.......HK has a new parkjet out. Or basically a revised one.

http://www.hobbyking.com/hobbyking/s...trSearch=parkj
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Old Yesterday, 08:59 PM   #655
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interesting...they include a 3 axis gyro with the plane, but it has no rudders. It also uses a 2 cell lipo. Not a bad price.
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Old Today, 02:53 AM   #656
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i still have 2 flyable hk park jets sitting in the hanger. i seem to remember them costing something like $15 for the kit and in the day shipping was around $17,so a overpowered setup making a really fast park jet didn't cost anywhere near $80.and i don't want to know what shipping cost is today from china

my 4850 kv ,with a 60amp plush on 3cells was money well spent.

narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old Today, 04:38 AM   #657
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Well I bought one of the $17 kits couple years back and after 0 luck getting it in the air I decided the small fast planes are not for me. I quickly went back to my slow flying powered sailplanes and the like. Plus my eyes are not quite as sharp as they once were so a larger model is definitely a plus.
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