TDR Technical Stuff (Tips) & Build Videos

[aussiemick]

I haven't looked to see how much teeter the blades have. I just put extra spacers in because the grips could slide in and out on the feathering shaft. It wasnt much, the 2 extra 0.2mm spacers did the trick.

Mick

[helicraze]

I didn't in the beginning at it felt fine, but now will add them in as i can slide the grips slightly.

[jointer]

My shaft does not have any play in horizontal direction, but i used 2 spacers in the build.
However i did have 1cm vertical play at tip just after assembly, which is getting worse during flights.
Jan said it will fly even with 2cm play, that i should not care about it.
What i do not like is very sensitive reaction especially on aileron inputs during hover on low RPM.
It sort of "bites" - i think the reason is the play in the head.

[Heli G]

Originally Posted by aussiemick

I haven't looked to see how much teeter the blades have. I just put extra spacers in because the grips could slide in and out on the feathering shaft. It wasnt much, the 2 extra 0.2mm spacers did the trick.

Mick

Yep, I used 0.2mm’s as well. Will leave as is and see how it flies.

[Heli G]

Originally Posted by helicraze

I didn't in the beginning at it felt fine, but now will add them in as i can slide the grips slightly.

Originally Posted by jointer

My shaft does not have any play in horizontal direction, but i used 2 spacers in the build.
However i did have 1cm vertical play at tip just after assembly, which is getting worse during flights.
Jan said it will fly even with 2cm play, that i should not care about it.
What i do not like is very sensitive reaction especially on aileron inputs during hover on low RPM.
It sort of "bites" - i think the reason is the play in the head.

I estimated that mine would have had similar play without the additional washers, maybe closer to 2cm. Thanks.

[helicraze]

Well i put the washers in and i have about 10MM movement at the tips (same as before) so anyway will just leave it at that.

[ZuvieleTeile]

Originally Posted by Heli G

I estimated that mine would have had similar play without the additional washers, maybe closer to 2cm. Thanks.

The additional washers have nothing to do with the vertical play.
The washers would take care of worn/soft o-rings and would eliminate the horizontal play.

The vertical play is a feature which was put in for the 2010 series of the TDR to eliminate wobbling with a flb system at very low RpM.

KR
ZT

[Heli G]

Originally Posted by ZuvieleTeile

The additional washers have nothing to do with the vertical play.
The washers would take care of worn/soft o-rings and would eliminate the horizontal play.

The vertical play is a feature which was put in for the 2010 series of the TDR to eliminate wobbling with a flb system at very low RpM.

KR
ZT

ZT, the addition of the extra set of washers reduced the play I had at the tips. Without them I could feel the feathering shaft having too much vertical play. My understanding is that the additional washers cause the o-ring busher to press against the o-rings slightly more, thereby reducing the play.

[Heli G]

Jan recommends not over-tightening the lower threaded bolt on the front tail boom holder (aluminium one) as it may damage the bearing on the bearing flange of the pinion gear (front of tail boom). I really don’t want my boom to slip/eject, so how much is too tight? Of course the rear boom holder (plastic) will also add security but I’m assuming you should not overly tighten it as well, right?

Did anybody have any problems with the newly designed tail drive rod and two bearing supports? The rod is made from aluminium with two brass inserts on either end. After installation, with both bearing supports correctly placed and tightened (as per spec) on the rod, I get what sounds like a very faint “rubbing” in the boom. It seems to come from the rear bearing support closest to the tail side of the boom. I can only assume that the tail drive rod itself must have a slight arching bend, causing the bearing supports to be slightly “off balance” when the tail drive rod is spinning. I did measure the rod and all is perfect and so is the installation between the front and rear tail boom pinions i.e. the rod is not too long causing the pinions on either side of the boom to jam, thus bending the rod.

[aussiemick]

I got the rubbing noise in mine as well.

I emailed Jan regarding it and he reckons it goes away once the tail is loaded up in flight.

I certainly couldnt tell it was rubbing during flight yesterday.

Mick

[Heli G]

Originally Posted by aussiemick

I got the rubbing noise in mine as well.

I emailed Jan regarding it and he reckons it goes away once the tail is loaded up in flight.

I certainly couldnt tell it was rubbing during flight yesterday.

Mick

That’s great news Mick, thanks for the feedback.

[ZuvieleTeile]

Originally Posted by Heli G

ZT, the addition of the extra set of washers reduced the play I had at the tips. Without them I could feel the feathering shaft having too much vertical play. My understanding is that the additional washers cause the o-ring busher to press against the o-rings slightly more, thereby reducing the play.

With the addition of the washers you "tightened" the o-rings and it reduces the overall play, but the real play comes from the delrin bushing having a 2/10 bigger hole than the feathering spindle's outside diameter.
Otherwise there would not be a need for the centerpiece bearings.

The play between the delrin bushing and the feathering shaft gives you about 3 mm play at the blade tip, may slightly more after everything has settled.
The other play comes form the o-rings being squeezed.

KR
ZT

[helicraze]

For the front bolt for the tail boom, have it so you can spin it with your fingers easily without horizontal play, then tighten 3/4 turn, its perfect

[Heli G]

Originally Posted by helicraze

For the front bolt for the tail boom, have it so you can spin it with your fingers easily without horizontal play, then tighten 3/4 turn, its perfect

Thanks, will do that.

[helicraze]

Make sure ALL the others are tight including the tail strut clamp. Its only the front lower bolt you need to be mindful off

[Heli G]

Originally Posted by helicraze

Make sure ALL the others are tight including the tail strut clamp. Its only the front lower bolt you need to be mindful off

Will do HC, thx. The build is done and I am setting up the mini Vbar tonight using Jan’s settings. Any mini Vbar tips will be appreciated.

[aussiemick]

The stock setting flies really well.

I would bump the tail gain up to at least 95 and the tail stop gain up to maybe 20. Mine was a bit mushy on the tail (very soft stops). I have also increased the Cyclic Agility up to 50.

More tweaking to come over the next few weeks.

Mick

[helicraze]

As i have had a TDR for quite some time some tips for VBAR.

I run 14 deg collective with stock recommended components and the stock vbar file with the following changes:

collective 87 (14 deg)
stick response aggresive

tail gain 95
i gain 55
acceleration 65
precomp 18 and 9

The only other things are personal preference eg agility/tail yaw rate.

I run 1850RPM.

[jointer]

I have pitch 95 in main menu, but even then i do not get more then 13 degrees.
I also noticed i have more positive then negative pitch, so it was necessary to compensate it by travel in radio, so i have -100% and +90% in Vbar SW.
I found on net this might be caused by servo travel optimization.
I am not happy with the tail (described in other thread), but i raised acceleration to 65 and precompensation to 26 (else the tail drift in pitch pumps), but stops after full piro are still good on one side and soft on other.
Probably needs adjusting the A/B gains to have it perfect.
What difference is in stick response?
I have Linear and i am a bit affraid what will happen if i switch to something else.

[OICU812]

Jointer linear is the expo meaning by linear u use tx expo not software. Stick response is time from stick movement to reaction time.