Basic

[feral63]

rusty,
try waiting till after the full moon and the tide is outgoing. then just after takeoff,
stand with your left foot slightly raised.
if that don't work you may have to listen to one of the other guys.

[notorious_benny]

Get your c o g right first!!! Put it where they recommend. (This is usually quite forward)

Then trim the model while in flight so that it is neither climbing or descending at full power. Then do the throttle chop thing. Untill you get your up/down thrust reasonably close with this method you wont be able to do what towball recommended, as it will be a bitch to fly with the elevator in the neutral position.

Dont worry about 'zero trim', it sounds like you up/down thrust is so far out that your model is going to want differnt trim setting at all different throttle settings. You need to address that first.

[RustyTumbles]

The CG is just behind the factory recomended. From straight and level at full power to idle it starts to decend not excessively, but this thing slows down very quickly. At low throttle I'm holding up to maintain altitude. Landing is done by pulling power to decend and holding some up to keep the 3 point attitude, then add power to stop the decent and a gentle flair. I'm not sure if some of these things are just part of flying a bipe as this is my first one.

I would have thought if you have down trim at full power and you pull power and it begins to dive you need more up thrust to get rid of the down trim?? Does that make sense.

[RustyTumbles]

	Quote: Originally Posted by feral63
	rusty, try waiting till after the full moon and the tide is outgoing. then just after takeoff, stand with your left foot slightly raised. if that don't work you may have to listen to one of the other guys.

Thanks feral You crack me up dude

[RustyTumbles]

	Quote: Originally Posted by notorious_benny
	Get your c o g right first!!! Put it where they recommend. (This is usually quite forward) Then trim the model while in flight so that it is neither climbing or descending at full power. Then do the throttle chop thing. Untill you get your up/down thrust reasonably close with this method you wont be able to do what towball recommended, as it will be a bitch to fly with the elevator in the neutral position. Dont worry about 'zero trim', it sounds like you up/down thrust is so far out that your model is going to want differnt trim setting at all different throttle settings. You need to address that first.

From what I can tell the right thrust is almost there but I really think that the up/down is more of an issue. You are right it does need defferent trim for different throttle settings????

[excelpoint]

Rusty if its behind the recomended then you need to get it forward a bit.

[notorious_benny]

If the model pulls to the belly at lower throttle that indicates to me that you have too much upthrust in it. I havnt seen your model but I will take a stab that you need some downthrust in there buddy! If your chopping that trhottle hard and it pitches down fairly quickly then that is an indication you are carrying down trim to compensate.

If I could see it in flight it would be much easier.

[RustyTumbles]

Ok, I'll put it together and have a look again. I'll add some more weight and get it on the factory setting.

[notorious_benny]

Sheez!! Rusty theres 6 members all checking out your post mate!! I dont know if we are making it easier for you or not with all these ideas coming from different corners!!

[rcdart]

If you have down trim, and you add up thrust, you will need more down trim, put some down thrust in it to remove down trim, but first do what everyone here has said and get the CG to factory or even a little nose heavy. Just an after thought, have you checked the incidence on your wings??? just a thought, but that will be having greater effect with speed change.

[RustyTumbles]

	Quote: Originally Posted by notorious_benny
	If the model pulls to the belly at lower throttle that indicates to me that you have too much upthrust in it. I havnt seen your model but I will take a stab that you need some downthrust in there buddy! If your chopping that trhottle hard and it pitches down fairly quickly then that is an indication you are carrying down trim to compensate. If I could see it in flight it would be much easier.

Thats what I thought. I'm trying my best to describe what it is doing I hope it makes sense to you all??? Thanks for the help guys. I'll make a few adjustments and see if it works out.

[rcdart]

4 posts added just while I finger tapped my last one

[notorious_benny]

	Quote: Originally Posted by RustyTumbles
	How do I get zero trim?? I am carrying some down trim as is at full power. Is that a thrust issue? Or do I adjust my elevators to where they are now with the matchbox with the trim centred? ...

What towball means is that the elevator is in the neutral position relative to the stab (zero trim). You wont be able to fly your model like that untill both c o g and thrust is correct.

Yep incidence is always fun on a bipe, all those wings!!!

[The Hobbyman]

Rusty,
Take it out and do the vertical test the way Towball mentions, this will give you a true indication of your'e thrust line, change the engine until it goes up and down dead straight then test normal and inverted flight are relatively the same ( same elevator input ) if this and everybody elses advise fails contact 3dubya for help.

[excelpoint]

All the info on here is spot on Rusty, but the most important thing first is to get that CG correct. If it isnt then everything else means nothing.