TREX250 Tail analysis, spacer upgrade and Chinese weights

[ipjodan]

Hello Heim,

Im in the same situation as Cyber Plains Drifter, can you please provide me with the info i need to get your upgrade kit?

Thanks

[daveapplemotors]

I have 3 HK250GTs. I lost track of the number of flights in the coupler of months since I have modded the tail with your bearing spacers and Chinese weights.

Report:
No crash damage except my stupidity for once flying a weak battery. I landed the FBL copter early on rough ground and it tipped spooling down. Broke a servo gear on .

I have worn out some parts and all three canopies don't have any scratches.

I have been having great FUN almost every day right in my own front yard even on some pretty windy days.

Another note:
I have a kevlar belt on one and the cheapy HK belts on the others. The HK belts are about 3 weeks older with maybe at least 40 more flights each and all the belts are doing well after 100's of flights. I have been too lazy to install the other two kevlar belts. And now I want to see how long the HK belts can last. I fly each heli equally. That way one motor is always cool.

Theory:
Constant control of the tail is easy on the parts.

Thanks Guys on the Forum especially Finless and Heim Joint for promoting these fine mods. Best bang for the buck since the Lipo.

[dustytran]

Hello Hiem
Ihave both the weighted copterX 250 and the non weighted HK250 tail blades and would like to fix my tail problems with your weights. Could you please pm me on how to get your weights. Thanks Dusty.https://www.helifreak.com/images/icons/icon7.gif

[mano]

Can you also PM me the Purchase info?
Thanks.

[crashmore]

The HEIM JOINT dual bearing + spacer upgrade fixed my tail wag. Awesome add-on. A bargain at twice the price.

[Inverse]

The preload spacer is IMO a must do mod.
My tail is utterly rock solid.

[akschu]

I'm building up a new 250, please pm me with ordering information so that I can get this installed during the build.

schu

[daveapplemotors]

No prob to PM you but this is good info for everyone

Ask Robin for:
Bearings
Spacers
Chinese weights -
tell him what size, brand, and tail grip style that you want these parts for. You'll spend about $25 plus or minus a couple.

Best stuff since the Lipo battery

"Robin Renzetti" <robrenz@frontiernet.net>

Thank again Robin, I have lost count of good landings since we met.

[syahbi]

where i can get this tail mode please

[crashmore]

Originally Posted by syahbi

where i can get this tail mode please

E-mail to Robin at the address above asking for his prices and ordering info.

[daveapplemotors]

Email this fellow - "Robin Renzetti" <robrenz@frontiernet.net>

Ask Robin for:
Bearings, Spacers & Chinese weights -

Tell him what size, brand, and tail grip style that you want these parts for. You'll spend about $25 plus or minus a couple. It's a deal at twice the price.

Best stuff since the Lipo battery

[Karenheli]

I have check my WFLY300 tail parts,made some changes and achieved a lot

[Slobberdog]

Darn I know this thread is as old as the hills but is this person still doing the kits as I have just got a 250 DFC and the tail don't inspire confidence

[Besen]

Originally Posted by Slobberdog

Darn I know this thread is as old as the hills but is this person still doing the kits as I have just got a 250 DFC and the tail don't inspire confidence

I bought a kit from him last October. Just use the email address in post 251 above and he should send you a price list.

[Slobberdog]

Thanks fella,

[Slobberdog]

Just out of curiosity how do you find the mod and has it helped with wag and tail authority, and are you still running stock servo and 3gx etc

[Besen]

It's a long story, but it didn't really work for me. I think the weights are ok but the spacers caused a wag. That my have been my fault but when I removed them the wag was gone. The problem appeared to be that when I tightened the grips on the tail blades the bearings were binding. I couldn't get it just right. Also, you have to file down the blades so that they don't hit the screw head holding the grips to the hub. I haven't messed with it since then. Many people here swear by them, so I would take my experience with w grain of salt.

I'm using stock DS410's for cyclic, a hyperion DS11-gcb tail servo with a carbon fiber pushrod, DFC head, beastx with a Spek DSM satellite, a Talon 15 ESC (with current limit disabled), 4,030 rpm governed head spead, and there's no wag. The tail authority is pretty good, but I'm still dialing it in and I'm not that good a pilot.

Honestly, I think it was the hyperion tail servo that fixed my wag, but even with that it wagged with the tail bearing spacers. The hyperion is smaller and lighter than the stock DS420 or 425, by the way. I'm going to put the weights back on one of these days because I think they're a good idea.

I warned you it was a long story. Hope this helps.

[Inverse]

I found it was a combination of many things, you really do need to get the tail perfect on these helis or you will get wag.

[Slobberdog]

Thanks both I don't have any wag at the gain I am running but I just feel the tail does not have that locked in feeling, I need a bit more gain I think to get that, but if I go into idle up 2 I get wag because of the increase in head speed, can run to 82% in IU but after 90% it wags if I don't lower the gain,

[bazsound]

Originally Posted by Besen

It's a long story, but it didn't really work for me. I think the weights are ok but the spacers caused a wag. That my have been my fault but when I removed them the wag was gone. The problem appeared to be that when I tightened the grips on the tail blades the bearings were binding. I couldn't get it just right. Also, you have to file down the blades so that they don't hit the screw head holding the grips to the hub. I haven't messed with it since then. Many people here swear by them, so I would take my experience with w grain of salt.

I'm using stock DS410's for cyclic, a hyperion DS11-gcb tail servo with a carbon fiber pushrod, DFC head, beastx with a Spek DSM satellite, a Talon 15 ESC (with current limit disabled), 4,030 rpm governed head spead, and there's no wag. The tail authority is pretty good, but I'm still dialing it in and I'm not that good a pilot.

Honestly, I think it was the hyperion tail servo that fixed my wag, but even with that it wagged with the tail bearing spacers. The hyperion is smaller and lighter than the stock DS420 or 425, by the way. I'm going to put the weights back on one of these days because I think they're a good idea.

I warned you it was a long story. Hope this helps.

Theres a video that shows hwo the spacers and crushable washerse to be installed.

It seems important that you tigthen up the screw a tiny bit at a time checking for play and also that the bearings run free, once you start feeling the blade grips start to bind back the screw of a fraction.

If yout ighten it down too much the bearings will bind