TailTouch

My Feedback: (54)

I found the pictures on pages 2 & 3....
I have a Brillelli-36. I have mounted the ignition module, ignition battery & throtle servo in the motor box.

Let's see how the plane balances with all the weight up front.

Scott Ellingson

My Feedback: (146)

I would not count on no iterference. Do a good range check. I had one customer with a 50 that ran a JR PCM for a while then switched to the DX7 and crashed from radio problems. He was not sure why. The plane went in to a lake and the engine is still there in 20 ft of water

reyn3545

Scott.. quick questions on the 46cc...

I got the engine in last week, looks great. The velocity stack sticks out beyond the side of my cowl.. would it be OK to run the engine without the stack, or should I just cut the cowl and let it get air from outside?

Also, if I use the stack and it's outside the cowl... do I still need the other tube running back into the fuse?

EXTRA ADDICT

My Feedback: (2)

To begin with I had my throttle servo on the motor box and the range check running was good for about 75 feet. I moved it under the wing tube and my range check doubled in distance or more.

reyn3545

Well, I got the engine installed and fired off today.... If this thing flies anything like it sounds... this oughta be a blast to fly!

I still have to permanently locate most of the receiver components and get the CG done, but other than that, its ready to go. Maybe I'll play hookey from work one day and get a flight or two in.

Jake Ruddy

My Feedback: (40)

sorry guys, I wasnt paying attention...

I mounted the gntion and ignition battery up on the engine box... everyhing else is in the fuse.

reyn3545

OK, mine's done... almost a month to finish, mostly waiting on the engine, but two weeks on the road and a long list of honey-do's thrown in for good measure. I think the engine was definately worth the wait.

I've got the engine sitting at 6 1/2 inches from the firewall, the ignition and NiCad battery on the motor box. I had to put 1 1/2 ounces on the tail for balance, but the whole plane after balancing came in at 12 pounds 9 ounces.

My 50cc plane weights just over 16 pounds, so the Yak at almost 4 pounds lighter should be a rocket ship.

I just hope I can get it throttled down enough to land... its running a little rough at slow idle now.

diviatix

What is the group's consensus on the choice of throttle servo?

reyn3545

Any analog servo you have laying around. There's a spring on the Brillelli throttle arm, so you don't want that pushing on a digital servo. There's not a lot of torque required to drive it, so just pick one off the shelf.

diviatix

Do you think an HS-81MG micro would suffice? 42oz/in -- 0.09sec/60deg

Cheers,

Andrew.

Jake Ruddy

My Feedback: (40)

Not a good choice... servo is not designed for that and will probably fial... tried them a couple itmes in different setups and they didnt work well.

diviatix

Thanks for the tip on the 81.

As I have a purely e-flight background with substantially lighter planes and no throttle servos, I am at a bit of a loss...

I could keep guessing...but perhaps someone could chime in with a servo recommendation that is suitable?

Cheers,

Andrew.

EXTREME FLIGHT

Standard Hitec 425 has always worked fine for me.

Jake Ruddy

My Feedback: (40)

425s are good... I have a JR in my newest plane but I cant remember the nember to be honest. I have used 425s, JR ST46 (sport series), another JR cant remember, tried some 81s.

Personally I think you just need a standard sized servo and then pic speed as you see fit.

diviatix

Thanks for the input guys. Think I'll try a HS-525bb then. 57 oz/in -- 0.13 sec/60deg

reyn3545

I took mine to the field today for its pre-maiden shakedown. I fired it up at the house yesterday and found that I had serious interference problems. This was after I was ultra careful about the setup. As it turns out, looks like the radio lockups may have been vibration related rather than traditional RF interference.

I checked all of the usuall culprits.. switches, servo cables, antenna wire, etc.. and nothing helped. Then, I remembered a vibration problem that I had with an old 4-stroke... the vibration was killing the receiver.

This problem was very similar to the old 4-stroke. I could stand over the plane with the tx antenna fully extended, and the plane would go into failsafe idle at just over half throttle. On a whim, I cut the zip-tie wrapped around the receiver, and the problem went away!

I took it to the field today for more extensive testing... I could walk as far as I wanted with the engine off, and about 100 paces with the engine spooled up before it went into failsafe. That should be good. I ran 2 tanks through the motor on the ground, so it should be good for some mild flying next time out.

Has anybody ever experienced lockouts from strapping the receiver down too tight? I didn't think it was over-tightened, but replacing the zip-tie with a velcro strap and fastening it a little looser seemed to resolve the problem. This is a JR R790 with synthesized channel selection.

coronabob

My Feedback: (10)

reyn3545 - If I were you I would send the receiver in for service. I suspect that you have a cold solder joint, a cracked component, or a cracked pc board. Since yours does not use a crystal you don't have bad/loose crystal sockets to worry about.

Jake Ruddy

My Feedback: (40)

I agree..

Always use velco.. it has a lot more give but serves teh same purpose.

You may have locked it down too tight.


Rule of thumb.. you should be able to get 90% of range check with engine on... so 100' engine off.. 90' engine running.

reyn3545

If Horizon ever gets the x9303's in.. I've got that and 3 new receivers on the way..

Scott Ellingson

My Feedback: (146)

I think I would not fly it with that reciever. If vibration is causing it to lock out, there must be somthing wrong inside. Somthing is moving in there causing it. Mounting it loose is just hiding the problem. If it gets a good jolt in the air for some reason it might do it again. I would hate to see you lose the plane over it. I usually mount mine with velcro too. I just think there must be somthng wrong with it to glitch like that, even mounted more solid like it was. Whatever it is could get worse quick and make it do it again, even mounted loose.

reyn3545

OK... good advise. I've got some other receivers, and I'd rather be safe than sorry. Thanks!

sprucie

No X9303 at KOSH. Horizon was there but not allowed to sell anything that flies. I guess the EAA did not want anyone firing up their new model in the campsite and damaging a full scale plane. The folks working the booth were very nice though.

When we first finished we had to put lead on the tail. Once we moved the engine back and the battery pack back it balanced at the aft end of the CG range.

I have a question: will an aft CG cause more coupling during knife edge flight. I seem to have enough coupling that knife edge circles toward the gear are easy and they shouldn't be at my level. It would make sense but I have not set up a plane of this size and capabilities.

Again any suggestions on a cheap reliable battery/regulator setup?

Thanks

reyn3545

I finally got the maiden in today.. the first takeoff was a REAL handfull. I had the control surfaces set dead even with the surfaces next to them, and as soon as this plane got off the ground, it wanted to nose dive and roll right... HARD.

I was able to get it higher up, continued to fight with it, and we finally got it trimmed out... about 5 clicks of left aileron and I don't know how many, but a bunch of up elevator. Sitting dead still, the elevator counter-balances are now at least 1/4 inch off from the leading edge of the horizontal stabilizer.

After that, and a little dialing in on the engine, it flies great. I would like the trim to be closer to "true". This plane is replacing a 90-120 size Aeroworks Yak that was absolutely rock solid on the maiden without a single click of adjustment. I guess I'm spoiled.

Anyway, its got PLENTY of power, the motor is a little soft in the mid-range, but I expect that to settle down as the motor breaks in. It will pop off on the first flip, then start on the first unchoked flip.. idles like my DA50, just a little more vibration. Taking the extra time to balance the prop made a huge difference on the ground.

I'm still feeling it out, still learning. You do have to bring a little more speed into the ground than with my 50cc extra, I guess because the nose creates more drag, it will slow down a little faster. Other than that, once its trimmed in, its a very predictable flying plane. Very much a "keeper".

I had 3 or 4 flights today, each felt a little better than the one before. If you're sitting on the fence with this setup, I'd recommend it. I don't know what created the out of "true" condition, but its there on my plane... be ready for it!

sprucie

I have read on the other 74 inch EF Yak thread about the incidence being off horizontal stab to wings and from horizontal stab to stab. I am experiencing alot of wing rock during elevators. I have ordered a digital degree measuring device. I also set the differential on ailerons to 50%. The airplane now aileron rolls like it is on rails. The setup on this plane is very important. Should get rock solid in time.

Ryen, what power supply did you use for the Radio gear.

reyn3545

For radio power, I'm just using a 2-cell Lipo through a Smart-Fly voltage regulator. No power box on a plane this size.

I'm a little dissapointed with the adjustments required to get this plane leveled out.