Need help for doing loop or roll !!
 

Hi all,

What should be check before doing my first roll and loop?
what kind of setting is recommanded for a 50 heli ? (such as: pitch angle, throttle %, gyro (GY401)....)

l know when doing such maneuver, Idle 1 or 2 is used. what about after that?

For a loop!
If l have enough forward speed, then just pull like a plane? until it is inverted give it some negative pitch and positive pitch again when coming down? is this correct?

same theory for the roll?

thanks for any help!!!

RE: Need help for doing loop or roll !!
 

I am a newbie to aeros. However I can loop fairly consistently.

Some people will tell you that you need to use Idle Up for aeros. Mine will loop fine in normal mode with about 9 degrees top pitch. I can't remember what it is at the bottom but it's nothing extreme (maybe 3 degrees negative).

If your model flies fine in fast forward flight (i.e collective all the way to the top, the engine does not bog down and the gyro appears to be perfoming OK) then I would say the model is ready for it.

The loop

Can you fly 'stall' turns?

That is the first place to start. Once you can do this run into wind (two mistakes high!) at max level speed. Pull back (it is hard to say how hard. Pull too much and the energy will be lost. Pull too slowly and you won't make it over the top.). If in the vertical you are running out of speed then stall turn out of it. If it is all looking good then reduce the collective slightly and let the model fly 'ballistically' over the top. Keep slight back pressure on throughout. If you have too much negative and use it all at the top you are likely to end up climbing in an inverted hover. This is best left for another day! As you come over the top of the loop keep the pull on and play the collective to level off. What will probably happen is you will panic that it is not going to pull out and pull back hard and use loads of collective. This will cause a harsh recovery as the momentum of the model builds up. This isn't a huge problem and you will quickly learn how to obtain a smooth exit back into fast forward flight.

The roll

I can't do this yet. My difficulty is that I have flown planes for a while and every time it rolls inverted I try and push the nose up. This does not work. To maintain forward flight it appears to me that you need to keep the nose below the vertical when inverted and hold the altitude with negative pitch. This may need more negative than the loop but if you roll quickly you may be OK. Perhaps someone can help me in this area too!

RE: Need help for doing loop or roll !!
 

You can kinda do it in normal mode but, ive crashed once doing it by accident. You would be much better off to use a proper set of stunt mode curves and set up.

The throtle curve for stunt mode would be around 100% at low 45% at mid, and 100% at the top. you can alter the head speed a little by changing the mid point setting up or down. try for 1850 - 1950 RPM. If you have 5 point curves set the 2 and 4 points to around 60 (forms a bit of a drooping V curve) keep the 2 and 4 points the same. Try a few settings around that range and get a feel for how they affect head speed. Recomend just making the set up and taking some time tweeking it while you get used to the idea of switching to stunt mode and back to normal, even if all you might do for a bit is hover and switch back and forth. The thing to watch out for is starting up in stunt mode! it will happen, so get in the habbit of checking your mode switch and holding the head real tight while starting just in case.

The pitch curve should be a straight line between 0 degrees at center stick, and +11 at the top and -11 at bottom. If you want you can go +9 0 -9 so it can't go as fast on you. I do sometimes when i am working in something new. (working on backwards and inverted flight now, so i have one set up that way for the last few weeks) If you have trouble reaching both directions equally the long rods between the top of hte head and the swashplate might need to be lenthened or shortened a few turns. make sure both are the same length. (if this is a raptor we are talking about)


Recomend just working your way up to doing a loop one part at a time. try hovering and rocking the heli back and forth maybe 30 degrees each direction so you get comfortable with how slow it rolls forward and back, and comfortable with making corections. side to side is a good warm up too. are you good at forward flight, making figure 8's ? if not do that first. learning things in the right sequence helps reduce crashes, and probably saves time in the long run.

there is a good setup guide for raptors, it is specific to raptors but the info is usefull if you have something else. www.raptortechnique.com

best of luck!

RE: Need help for doing loop or roll !!
 

Just another thought. Just in case you might be set for hovering at mid stick (5 degrees pitch at mid stick), start by getting the normal curves set for 0 degrees at mid stick.

(really sucks to be hovering low and flip a switch and have the heli smack into the ground!)

RE: Need help for doing loop or roll !!
 

I have just re-read my post.

My Ergo will fly loops fine in normal mode. However my comment about climbing in an inverted hover needs expanding. This will only happen for a short while as the head speed decays. The heli will then fall out of the sky. The way I fly my loop results in very little pitch over the top. This means that the head is not too loaded and will not decay significantly in RPM for the short time over the top.

I think you would need to use idle up for the rolls as you will probably need a bit more negative than the loop and will be holding it for a longer time. The risk of RPM decay is higher.