My Roban 700 Apache "Longbow" build

[Aces]

Hi. That looks great. Will he be selling these exhaust mods? Would love that. Also, that sight you mentioned for the helical gears is in German? How do you know what to order? I cant even figure out what to click on for gears :)

[RCjetdude]

Almost done.

[RCjetdude]

Michael did a great job with the CAD work. He is working on his own Apache and scanned the fuse in to accomplish this. They turned out great! His son works on the E models and has been able to provide lots of good pictures. I am his guinea pig and have provided some feedback on a couple small items. I am not aware of another RC Apache out there with these exhausts but this is what they are all going to if not already. Once I get the other side done I will be able to start working on the 3 color NATO camo paint scheme. I need to decide if I am going to articulate the gun and MTADS, add bearings to all the wheels and make the tail wheel pivot. I have an idea of how to lock it in flight and it would be neat to be able to taxi it around. Still thinking on those mods.

[Alpha]

That changes the bird's entire look, I really like it and it blends well!

[RCjetdude]

Right side is done.

[RCjetdude]

Merry Christmas to you too!

[Hardway]

Just loving the details!!! Very cool!

[Hardway]

Merry Christmas bro

[RCjetdude]

Scaleflying.de got in more helical main gears so a I have one on the way. Working on the latest mod to add the up turned engine exhausts. They were designed by Michael Brown and printed in ABS. They fit perfectly!!! One side down, one to go.

[RCjetdude]

Anyone have a helical main gear and pinion for the 700 they would be willing to sell? The two main sources I know of are out of stock at the moment.

[RCjetdude]

Sounds good to me. I will change it

[Alpha]

Short of having an onboard GPS with enough resolution and high enough refresh rate, it doesn't sound like it would be feasible to have it function safely in all stages of flight. I like the idea of simple "retract" setup, where the stab is in "Hover" mode and "Flight" mode. It would be much easier to trim it for forward flight and set that as the latter mode, then trim it for hover and set that location as hover mode. All you'd need to do is time the transition...

[RCjetdude]

I added a separate Rx to provide for more AUX functionality and mixed the stab to the throttle/collective stick. At bottom stick it is down while at hover and above it is flat to avoid the pitch of the stab fighting the FBL in high speed forward flight. I don't know of a way to automate it to know the difference between forward flight and hover. The Vario I saw fly at the Southern Classic leveled the stab at lift off. If there is a way to do what is being discussed I would love to know. A separate gyro for the stab may not be enough. Maybe some kind of accelerometer or GPS device like drones use?

[F106DeltaDart]

F106DeltaDart

Would you recommend a mix to pitch, perhaps on a loose curve (to approximate correlating airspeed), or maybe just on a gyro? I'm unaware of a mixer to coordinate all three.

Alpha, on my 500 Apache, I just opted to put it on a slider. I treat it almost as if it's a retract switch. If I'm hovering, it's down and in fwd flight I put it up. I thought about mixes, and honestly the interaction is just a bit too complex to program at this scale with a lot of work.

A collective is a good starting point, but it really needs airspeed as well. Otherwise, you might have the H stab come down at high speed or in a fwd flight climb where the same collective (or more) than hover is required. And although airspeed systems are available for RC, calibration of a helicopter airspeed system is a MAJOR headache. Even on the full scale, it's very easy to end up with bad data.

[Alpha]

F106DeltaDart

Would you recommend a mix to pitch, perhaps on a loose curve (to approximate correlating airspeed), or maybe just on a gyro? I'm unaware of a mixer to coordinate all three.

[F106DeltaDart]

Looking great! Dustin did a great job on that hinge. As for scheduling the collective to the H-stab, typically it's done the other way around. The H-stab should be down (fully stalled) in hover and be level in fwd flight. Otherwise you'll get a pretty large nose down pitching moment with airspeed. On the full scale, the H-stab is controlled by a variety of parameters including airspeed, pitch attitude, and collective.

[Alpha]

I love the networking aspect of Hobby Squawk, too! I would never have guessed that thisguy65 was a machinist. Good work and hats off to the both of you. This mod really helps sell the realism.

...Hellfires next?

[RCjetdude]

A huge shout out to Dustin Holloman (thisguy65) of Raven Rock Machine who designed and fabricated a sturdy aluminum hinge to allow the stab on my Apache to articulate. If you ever need any CAD or machining services, hit him up. I love the networking that happens on this forum.

[RCjetdude]

Added the wire strike diverter to the tail wheel.

[Hardway]

Great work bro!