Jet Hangar A4 / dynamax conversion. - RC Groups
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Nov 02, 2008, 06:11 PM
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kevin's Avatar

Jet Hangar A4 / dynamax conversion.

My buddy Paul showed up at the field today with his new dynamax / scorpion /12cell conversion installed into his JHH A4.

I had previously flown the plane with the glow fan and Paul gave me the honors on the conversion today. rtf weight on the electric version is 13lbs if i remember correctly.

In a word...Awesome...It like an entirely new plane. MUCH more vertical and speed.

Here are a few pics that i said i would post for him (no video )

hopefully he will jump in with the particulars on how he did the conversion.

After having flown this i can see the e-dynamax showing up in more than a few scale birds.
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Nov 02, 2008, 06:20 PM
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Sean Sweeney's Avatar
Was that flown with out inlet ducting, or an inlet lip?

Nov 02, 2008, 06:30 PM
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No intake lip, no ducting.
I was impressed.
Very nice sound, very quiet.
Nov 02, 2008, 06:54 PM
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kevin's Avatar
flown the way it is shown in the pics. it goes against conventional wisdom, but works well.
Nov 02, 2008, 07:35 PM
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k_sonn's Avatar
Wow Kev, that's pretty cool. Tell Paul congrats for me.

Did you get any numbers? What scorpion motor and how was it mounted? Any info would be awesome.

Nov 03, 2008, 08:10 AM
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Hi guys its me Paul,this is what I did to make the conversion. first I started with the byron fan adapter,yes the byron fan adapter will fit,you must hone out the dynamax center,also cut the IC engine mount off, then I chose to use the scorpion 4035-630 with replacment 8mm shaft, then last but not least called up fred baldwin and purchased a 8mm collect,roter and spinner,I have to tell you his collect is bullet proof. to get all this to work all you have to do is drill and tap the byron adapter where the stater bolts are located,with I think 16 staters theres no way this things coming loose.I only use 8 bolts for this conversion. will post some pics of how it all is done this evening after work as they are on another cpu. kevin thanks for all the help.
Nov 03, 2008, 08:13 AM
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Thanks K sonn hope to see you again soon.
Nov 03, 2008, 08:16 AM
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Very Well done, lets see some video if you can.

Nov 03, 2008, 08:28 AM
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oh yeah you guys might wanna know this stuff. hv110, 90amps 3600 watts those are the numbers, they didnt change with the tale pipe added,I know it just stayed the same outlit diameter is right around 3 1/2 inches.
Nov 03, 2008, 01:05 PM

Dyn-E-Max /Scorpion

Hi Paul,
I know we talked last night, but I also wanted to congratulate you on a will earn effort. If I can be of any additional help, don't hesitate to call.

Fred / 1-317-293-6449
Last edited by bladexz2; Dec 14, 2008 at 07:11 PM.
Nov 03, 2008, 01:42 PM
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bigjohn's Avatar
Yes, we need some details on this! I have a few planes that could benefit.

I have more Ramtech fans than Dynamax sitting around. I would think this would work just as well for a Ram-tech. What do y'all think?
Nov 03, 2008, 02:09 PM
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Sean Sweeney's Avatar
Yes, please post the details of how you did this conversion! I have a YA F-16a that had a Dynamax fan in it. I was going with a DS fan, but this sounds like an easier way to go.

Nov 03, 2008, 08:27 PM
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racer1's Avatar
Originally Posted by bigjohn
Yes, we need some details on this! I have a few planes that could benefit.

I have more Ramtech fans than Dynamax sitting around. I would think this would work just as well for a Ram-tech. What do y'all think?
During my testing of fans and deciding to convert my Dynamax, the Ramtech has a much more agressively pitch blade. The amp draw was quite a bit more with less static thrust than the Dynamax. It may perform differently in the air. It is a future build for me since I have had great preformace out of the Dynamax.
Originally Posted by Whistling Watts
Just got sight of the video posted of Clay Sherrows Scorpian outrunner equipped Dynamax Falcon 120.

See what I mean about how quiet this fan is and this is hanging in the open air, imagine how it would sound in ducting!

I will let someone else post the details of setup later on if they wish (come on Clay/Darren dont be shy).

This is very nice, my sort of model (I wonder why!).

Thanks Clay
Nov 03, 2008, 09:19 PM
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Ok guys heres a couple pics to show how the byron adapter does the trick. guys I personally have a good feeling about this dynamax fan unit being converted,I will tell you why,im no big specialist on thrust and eflux, but what I can tell you is that there was a apples to orange comparison in performace in the way the plane flies,this plane is well battle tested many of flights on glow and almost all of them sucked. I have had this plane for over 10 years and never had any plans on any kind of upgrades, but I can tell you with this new power system, she will get a full overhaul this winter. also for all those guys out there with planes that have been sitting in the basement long forgottin about. I think Im about $700.00 dollars into this conversion, batteries an all. anybody have any questions I will do my best to answer them. thanks
Nov 03, 2008, 09:44 PM
EDF all the way!
bruff's Avatar
How much did you open up the mount to allow the Byron adapter to fit?

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