HSD MB339 review anyone???
#101
My Feedback: (15)
Hi Randy, I have 3 sets of the JP brakes, Boomerang MB339, Boomerang Turbinator II, and a turbine converted Freewing F-18c. Mine are the older sets without the pots. They're proportional. However they all suffer from un even brake application which results in a very squirrelly landing and usually dragging a wing tip or nascar slide to stop. My friends Boomerang Sprint had the same tendency to zig zag and usually wound up dragging a wing tip. The work around that we both have had success with is to use a 3 position switch. POS 0 off, POS 1 drag, POS 2 full on. (On radio setup you need to setup in this order. Off, then Full On, then Mid) (kinda like setting up flaps). I'm using a JR 10x with dm9 airmod, He's using s Spektrum GX11,
I also have my elevator mixed to my brake, down applies brake and I use that feature for taxing. My friend copied my set up with the exception he mixed his slider to control brakes for taxi. We fly primarily off asphalt, but sometimes the dry lake bed. stopping is the same for both surfaces.
In landing approach on down wind to base I flip my brakes to POS 2 full on, this magnetically pulls both plates against brake coils, I count to 3 then I set to POS 1 which reduces the magnetic field and reduces braking force to draggy but not locked and then make a normal landing with partial brake applied, and just let it slow to a stop.. Plane lands straight, if more brake is needed I apply down elevator. Because the brake plates are already magnetically in contact plane stays straight.
Hope this helps
Mike
I also have my elevator mixed to my brake, down applies brake and I use that feature for taxing. My friend copied my set up with the exception he mixed his slider to control brakes for taxi. We fly primarily off asphalt, but sometimes the dry lake bed. stopping is the same for both surfaces.
In landing approach on down wind to base I flip my brakes to POS 2 full on, this magnetically pulls both plates against brake coils, I count to 3 then I set to POS 1 which reduces the magnetic field and reduces braking force to draggy but not locked and then make a normal landing with partial brake applied, and just let it slow to a stop.. Plane lands straight, if more brake is needed I apply down elevator. Because the brake plates are already magnetically in contact plane stays straight.
Hope this helps
Mike
#102
Thanks Mike! That's great information. I will give it a try with the three position switch. The pots on the controller really have no functional affect on the braking. Too bad we have to have this work-around. I wonder if there is an better aftermarket brake module that could be used?
Randy
Randy
#103
My Feedback: (1)
This works on my foamy Mirage with JP brakes:
https://www.rc-castle.com/index.php?route=product/product&product_id=7910
Check this video of a foamy F-16:
https://www.rc-castle.com/index.php?route=product/product&product_id=7910
Check this video of a foamy F-16:
Last edited by Thud_Driver; 09-29-2019 at 09:49 AM.
#104
Senior Member
Thanks Mike! That's great information. I will give it a try with the three position switch. The pots on the controller really have no functional affect on the braking. Too bad we have to have this work-around. I wonder if there is an better aftermarket brake module that could be used?
Randy
Randy
#105
My Feedback: (15)
I think Afrerburners is correct on the pulsing controller. However I'm tired of spending money lol. I believe the JP flaw is there are no springs behind the brake disc so it needs a good bit of current to create a large enough magnetic attraction to move the plate to the coiled housing, by then you are in a locked situation and then need to reduce the current to relax the attraction. Because no 2 brakes are the same you get an uneven result. When I have time (after the Best in the West Jet Rally) I'm going to research some small springs to see if that would prove or disprove my theory. Till then it's the work around.
#106
Thanks guys. Great ideas. I will keep experimenting. Mike, let us know if you find success in adding some springs.
Thud_Driver, thanks for the recommendation and the video. Huge difference in your foamy braking.
Thud_Driver, thanks for the recommendation and the video. Huge difference in your foamy braking.
Last edited by Randy Smith; 09-29-2019 at 10:45 AM.
#108
Here is another work-around for the brake problem. I have implemented this work-around and it does help with the extreme ON/OFF condition of the brakes. I can get a bit more control in terms of proportional braking. Difficult to get both wheels the same.
JP Brake Work-around
Randy
JP Brake Work-around
Randy
#111
My Feedback: (11)
I think Afrerburners is correct on the pulsing controller. However I'm tired of spending money lol. I believe the JP flaw is there are no springs behind the brake disc so it needs a good bit of current to create a large enough magnetic attraction to move the plate to the coiled housing, by then you are in a locked situation and then need to reduce the current to relax the attraction. Because no 2 brakes are the same you get an uneven result. When I have time (after the Best in the West Jet Rally) I'm going to research some small springs to see if that would prove or disprove my theory. Till then it's the work around.
#112
Thread Starter
My Feedback: (3)
I understand they may be available from Nova Jets.
https://nova-jets.com/collections/tu...9-v2-1-75m-arf
Randy
https://nova-jets.com/collections/tu...9-v2-1-75m-arf
Randy
Last edited by extra 300; 11-18-2021 at 12:16 AM. Reason: typing error