JR XP7202 on a Blade Cp pro

[pvtllchurch]

Had a CP pro now for about a month. readthrough a few forume des and have decided that i want to get the TREX 450 next. I researched radios and decided that i will be getting the JR XP7202 for it. Now my question is:
Is there anyway to install this radio on to my CP pro? I have heard that it cant be done because the CP pro uses negative shift, while the JR radio uses positive shift. Is there a way around this?

[carlo_the_wonder_frog]

No way around it, but you could just get a JR 6 channel receiver and swap it with the CP Receiver. XP7202 is a nice radio, I am getting the spektrum version soon as it comes in.

[Pinecone]

Yes, you will have to swap out the Rx. I would probably try the Berg 7. That is what I am going to in my Blade CP that is turning into a Pro to use with my JR Tx.

[pvtllchurch]

the included Rx with the 7202 wont work with the cpp?

[Pinecone]

Yes, but it a bit large and heavy.

Another choice that some have run is the Corona/Vamppower/Light Flight D6 Rx. Dual conversion , shift select, small light, cheap servo. I have one I may try.

[pvtllchurch]

cool, thanks

[Rodan]

I just flew my BCPP with the JR7202 for the first time today, after about 2 months learning to fly it with the stock radio. I'm in the same boat with a bigger heli in the works and wanted to learn radio setup on a familiar platform (minimize variables :wink: )You will need to use a receiver that is compatible with JR's shift. I was just looking at the Berg receivers, but going to a crystal receiver kind of defeats the synthesized channel feature of the 7202.

I used the 790 receiver that came with the radio. It's only a couple of grams heavier than the stock Eflite receiver, and physically about the same size. The only issue is the plug-ins are on the end, rather than the side. I ended up angling the receiver down towards the nose, with the plug-ins at the back, and it fits fine.

I've only hovered with it so far (just a quick test), but it feels nice. I still have a fair amount of tinkering and dialing in ahead of me... especially since this is my first RC anything, and my first computer radio... :shock:

[pvtllchurch]

Rodan, let me know what settings you are using when you finally get it working.

[Rodan]

OK, so far I've only run a couple of packs in hover and some limited slow maneuvers testing the radio settings and gryo. Hopefully, if it's not too windy tomorrow, I can get in 2-3 packs of FF to evaluate things. These are the settings I'm using so far:

CH1 - Throttle - normal

CH2 - Aileron (left rear swash servo - Ch6 on stock RX) - reverse

CH3 - Elevator (front swash servo - Ch2 on stock RX) - reverse

CH4 - Rudder - reverse (Rudder ESC lead goes to gyro (Eflite G90) and gyro goes here)

CH5 - Gear - I have the gyro gain lead plugged in here

CH6 - Aux1 - (rt rear swash servo - Ch1 on stock RX)

CH7 - Aux2 - not used at this time

All set to 100% travel adjust high and low except for throttle - 105% low

Swash set to 120 deg CPPM, and mix 60% on Aile, Elev, and Pitch

I've got no Expo or Dual Rate programmed at this point, everything is linear. Throttle hold is set on the Rudder D/R switch.

Throttle and pitch curves are pretty straightforward to set up. I'm not interested in 3D (at this point anyway), so my Normal flight mode is pretty much the same as the stock curves, except I dealed out most of the neg pitch so it only goes a couple of deg negative under half stick (half stick is 50% on all three modes). Stunt 1 is set up for 75% throttle from 0 to mid stick, increasing to 100% at full collective. Stunt 2 is 100% throttle across the board. I'm really just using these modes for increased headspeed at lower pitch settings for now. These are just set up for my flying at the moment, and may or may not be useful to you. As an alternative, you can duplicate the stock BCPP throttle and pitch curves to start out.

The Gyro settings are where things got confusing for me. I did a bunch of experimentation with a friend today on my BCPP (Eflite G90) and his TRex 450 (Align gyro - I think the same unit as the G90). The stock BCPP Tx has a gain knob to adjust the gyro gain, and set rate or HH mode by where the knob is. There is no such animal on the 7202 tx. I have the gear channel set to "gyro", and the gyro rate settings are programmable in the "gyro sens" menu. You can set a particular rate (expressed as a %) for each flight mode (norm, stunt1, stunt2). Through much experimentation (the instructions pretty well suck as far as the gyro settings are concerned :arggg: ) it appears that it works somewhat like the stock Tx knob: values under 50% are 'rate' mode, and the further from 50%, the more sensitivity; values over 50% are 'HH' mode, and the further away from 50% the more sensitivity. I may be wrong, and someone please correct me if I am, but that's how it appears to work.... I've got mine set at 85% at the moment.

An alternative way to set the gyro is to use the 'gear' channel, but select 'gear' in the input menu. You can then use the gear switch to set 'rate' or 'HH' mode, and use travel adjust and subtrims as described above to set your gain. This is what my friend had done with his Trex at someone else's direction, and it seemed to be working OK.

I honestly am not sure about the whole gyro setting process, but that's what we were able to come up with today. It seems to be working ok... :bomb:

Anyway, I know this was a long post, but that should get you in the air, and from there it's a learning proces as far as what you want out of your heli...

Well, this got me up and flying, now it's just time to fine tune...

:mrgreen:

[Rodan]

After talking to several other folks, I am using the gear channel for the gyro, and setting gain with travel adjust.

Flying great so far... :D