Roban B407 AeroMed 700 Size Scale Build

PawPaw · Jun 27, 2020, 06:23 AM

Certainly no hurry...got a ways to go before it’s in shape anyway. Thanks!

lt1pwr · Jun 27, 2020, 06:04 AM

Sorry for the late response. I was wrong, my tail blades are 120mm length and they fly great. I’m gonna find those extra tail blades this weekend, I have them in a box somewhere in my basement. I just need to double check they’re 120mm since I tried many sizes until I found these. I’ll get back to you on that.

PawPaw · Jun 26, 2020, 12:23 PM

Wow, lt1pwr...that’s awesome! I emailed Tyler about 3Ding a LifePak 15 cardiac monitor for me & still waiting on my EMS bag & O2 cylinders from Scale Modela to arrive. Lots of work to do.
Sure! Lemme know cost & shipping on the blades & I’m in. Thanks!

lt1pwr · Jun 26, 2020, 08:43 AM

As far as the tail blades, my kit is over 2 years old and the tail blades it came with were too short and I almost lost the heli due to lack of tail authority. I put some longer tail blades on which I believe are either 110mm or 105mm and it flies perfectly now. I can verify the tail blade length when I get off from work tonight. I also may have a spare set of the same tail blades I'm using if you don't want to wait on MRC.

lt1pwr · Jun 26, 2020, 08:33 AM

That's looking really good! Reminds me of the medical interior I built for my Roban AS350.

PawPaw · Jun 26, 2020, 06:21 AM

I’m waiting on Motion to restock the tail blades so I can cut a set down & have spares. May just do it now since you got good results on yours.

Still a ways to go, but here’s the idea:

DCORSAIR · Jun 25, 2020, 05:57 PM

Originally posted by PawPaw

Still making progress on the 407.....
1. Decided to copy lt1pwr’s suggestion, sort of. The “as designed” location of main batteries in the doghouse works but had to get creative with wire routing. I am using a 2S 3000 LiFe receiver battery which fit perfectly on the floor behind the pilot’s seat & is virtually invisible. Thanks, lt1pwr!
2. Didn’t like the painted cabin wood & exposed joints so used 3M 3” white vinyl satin finish tape to cover everything.
3. Ordered a few scale bits from Fine Scale Modela & awaiting shipment.
4. Still tinkering with lights. Decided to use a second controller for the 2 landing spots & instrument cluster on one receiver switch & the nav light controller on the second receiver switch.
5. Didn’t like the long “unscale” tail blades, and noticed the promo pics of the Roban B407s show shorter ones. Specs say they are 110mm, but mine measure 158mm. I emailed Roban, & they answered in less than 24 hrs. The longer blades are correct as Roban found greater thrust was needed. They don’t rotate the scale direction anyway so will live with it.
6. Added main battery voltage telemetry to my Tx. Can now read Rec & LiPos. Thinking about taking the temp sensor off my Waco’s Saito R19 & putting it on the motor base or ESC. Totally unnecessary, really, but plan to sell the Waco so sensor is available.

Sounds great, get us some pics when you can.?

My Roban 800 size Hughes 500 came with those long blades, I thought they looked way out of scale, so I cut mine down to 140mm, they look so much better and it flies fine, don't see any flight difference, just thought I would mention it, test them first before you fly it, make sure you balance them again.

lt1pwr · Jun 25, 2020, 10:49 AM

Those changes sound great

Let's see some pics!

PawPaw · Jun 24, 2020, 07:07 AM

Still making progress on the 407.....
1. Decided to copy lt1pwr’s suggestion, sort of. The “as designed” location of main batteries in the doghouse works but had to get creative with wire routing. I am using a 2S 3000 LiFe receiver battery which fit perfectly on the floor behind the pilot’s seat & is virtually invisible. Thanks, lt1pwr!
2. Didn’t like the painted cabin wood & exposed joints so used 3M 3” white vinyl satin finish tape to cover everything.
3. Ordered a few scale bits from Fine Scale Modela & awaiting shipment.
4. Still tinkering with lights. Decided to use a second controller for the 2 landing spots & instrument cluster on one receiver switch & the nav light controller on the second receiver switch.
5. Didn’t like the long “unscale” tail blades, and noticed the promo pics of the Roban B407s show shorter ones. Specs say they are 110mm, but mine measure 158mm. I emailed Roban, & they answered in less than 24 hrs. The longer blades are correct as Roban found greater thrust was needed. They don’t rotate the scale direction anyway so will live with it.
6. Added main battery voltage telemetry to my Tx. Can now read Rec & LiPos. Thinking about taking the temp sensor off my Waco’s Saito R19 & putting it on the motor base or ESC. Totally unnecessary, really, but plan to sell the Waco so sensor is available.

lt1pwr · May 24, 2020, 03:01 PM

Thanks! I wish I could take credit for it but a good buddy of mine made it for me.

PawPaw · May 24, 2020, 10:03 AM

Outstanding work, sir! Amazing.

lt1pwr · May 24, 2020, 09:26 AM

It’s actually vacuformed

PawPaw · May 24, 2020, 07:57 AM

BTW, Jay...did you 3DP that headliner?

lt1pwr · May 24, 2020, 07:02 AM

Thanks! Yeah I tried several locations for the ESC and wasn’t happy with any accept where it’s at now. Good luck with your build!

Jay

PawPaw · May 24, 2020, 06:30 AM

Awesome work, Jay! Your 407 really stands out. Since I’m trying to capture the details of N922TC I’ve been thinking about placing the ESC under the stretcher base which replaces the port side rear facing seat & the port side copilot seat, but thanks to your pics the ESC would work better in the doghouse with batteries below. Thanks!

lt1pwr · May 23, 2020, 08:21 AM

Nice choice on your 407. Roban did a decent job capturing the details from the full scale helicopter. There are several things that are wrong or need to be corrected but all in all, it’s a nice looking bird. Regarding your ESC placement and the need to extend the wires, I had the same dilemma and didn’t want to extend the wires which could solve 1 problem but create another. Another concern is stuffing 2 batteries and an ESC in close proximity of the motor under a very tight and small space environment under the dog house. There would be a lot of heat build up and a possibility of a battery wire coming in contact with the rotating can of the motor and causing a short and having a total electrical failure. My solution was to move the batteries inside the cabin thus leaving open space in the dog house for less heat build up and congestion. The batteries in the cabin are in the open and helps keep them cool. You can’t even see the batteries unless I point them out. They are easily accessed by removing the rear facing seats which are held in place by magnets. The battery wires go up through the ceiling in to the doghouse where they are easily connected to the ESC. This was a win/win for me and I’ve had no issues whatsoever.

As your building your 407, keep in mind that it’s extremely tail heavy and you will need to add a lot of ballast weight up front. I chose to fill the front seats with bb’s and sealed them with hot glue. That plus the batteries in the cabin and my receiver battery under the forward facing rear seats held by magnets balances it right on the money.

Hope that helps and gives you some options to think about!

Jay

Attached Files

PawPaw · May 19, 2020, 09:30 AM

Landing spot lights turned out to be fairly easy to figure out. Now on to the pop out floats & helium/nitrogen inflation bottle.

PawPaw · May 18, 2020, 09:27 AM

Another issue I’m researching is the need for a capacitor bank mounted between the batteries & ESC....mounted close to the ESC. There will be a long wiring run to the ESC which appears to require mounting at rear fuselage. Maybe it’s a car thing, but I’m reading capacitors are required to “protect” the ESC from surges when long wiring runs are required. Castle Creations sells these so must be science behind the thought. However, my thoughts are the helis don’t see rapid and frequent throttle changes like racing cars so the caps aren’t necessary? Ideas?

PawPaw · May 18, 2020, 08:28 AM

Yes sir, I’m waiting for this COVID-19 issue to resolve more so I can sell some airplanes. I have many!

PawPaw · May 18, 2020, 08:25 AM

There are quite a few photos available for N922TG & I plan to add pop out floats & the skid mounted spot lights. The lights are in hand but need to figure out material for the floats, med stretcher, etc. All ideas are much appreciated!