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Next D Rave Ballistic 3D-450 ENV-700
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Rave 3D 450
Notchy main grip bearings even with new bearings...
husafreak

Key Veteran

Livermore, NorCal

This problem with my Rave 450 has never been solved (by me) so I thought I would ask... My main grips are machined so tight that when I replace the bearings (4x10x4) even if I heat the grips I still have to press the bearings in with a drill press or vice. They are then notchy just from the external pressure. Every time I bend a spindle and replace the bearings I contemplate new grips but I would hate to waste the bucks if they are all like that? My Rave is pretty old, maybe CY fixed that issue? I can only imagine how much better it would fly with smooth grips! It is great already.

05-14-2013 Over year old.
MarshallB

Veteran

Middle Arkansas

That's an interesting problem. I've not seen that even in one of my first production run Raves. It may be worth reducing some material inside the bearing race if you have a way. It probably would not take very much to relieve some of the pressure. Probably just rolling a dremel sanding wheel around inside slowly checking every so often.


CurtisYoungblood.com
Next-D
Spyder Batteries

05-14-2013 Over year old.
KevinB

Key Veteran

Saskatoon, Saskatchewan, Canada

What temperature are you taking the grips up to? I've found 375F seems to loosen up even the most stubborn bearings.

Throw the replacement bearings in the freezer and turn on the oven. Once it's up to 375F, put the grips in the oven and set the timer for 20 minutes. When the timer goes off, take one grip at a time out of the oven and push the old bearings out. Clean any residue out of the bearing sockets but be careful.....those parts are still REALLY hot! I use an old oven mitt to hold the part.
When they are cleaned up, throw the empty grips back in the oven for an additional 15 minutes. When the timer goes off this time, get the new bearings from the freezer and take one grip at a time out of the oven and slide the new bearings into place.

Unless your grips are actually under-machined, this should work for you.
If you do still have to press the bearings in, use something like the right sized 12 point socket that will only press on the outer race. Any significant pressure on the inner race or shield area of the bearing will likely cause damage and will make your new bearings notchy.

KevinB

05-14-2013 Over year old.
husafreak

Key Veteran

Livermore, NorCal

I'll get a new set of bearings and try it again but I believe the grips were under machined. I usually use a very powerful heat gun to heat metal parts for bearing replacement but I have used the oven for fuel engines. What always happens is after the bearings are in and the grips cooled I can spin them with a pencil for instance and they feel notchy. And after the head is reasembled they stil feel notchy. I am going to try a dremel to remove a tiny bit. I do remember I had to remove the anodized finish from the blade bolts due to them being overly tight in those grips. Maybe I need to use bearings sourced from CY.
Marshall check out Helifreak, some guy has a design for new frames for the Rave 3D. Pretty cool graphics although I am skeptical of "improving" the best flying 450 heli on the market...

05-14-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

Any link to see those frames? I've really considered drawing a new set a hair thicker to try and improve the flex in the frame

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-14-2013 Over year old.
Dragon09278

New Heliman

Morgan, Utah - United States

Hey, I'm the guy husafreak mentioned. Don't mean to derail the thread, but these are the frames I designed. Still a work in progress, but they're coming along. Some of the features are

1: Better CG for heavier packs. It should easily run packs up to 250 grams.
2: Third bearing block.
3: Better protection for the gyro.
4: Better servo geometry. This is still a work in progress, so expect it to change from the way it is in the pictures.

05-14-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

I like the battery idea and def liking the way this is going. If I could add my input, I'm a 6s fan and maybe you can test the dimensions to make sure it can accommodate 6s packs as well. Also if possible, I really think the gyro directly centered to the main shaft was a good idea. Correct me If I'm wrong tho.

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-14-2013 Over year old.
husafreak

Key Veteran

Livermore, NorCal

Yeah that's the one! You should probably post on both sites. Heck you should probably contact CY himself. The mods you suggest are certainly OK. Even with the tail mounted servo kit I still need lead to balance with my 4s packs. Another bearing and rearranged srvos cetainly couldn't hurt. Stronger frames is OK, won't need the frame stiffener set. But as a long time Rave 3D fan I sincerely believe there are only two major problems which have killed Rave sales, the weak tail drive gears, and the unavailability of parts, specifically the FBL head upgrade kit. We need those more than frames unfortunately ;(

05-14-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

I agree! I love my rave but times got me nervous with the lack of sales. I sure hope it don't get discontinued! But count me in! I'd love to be a test dummy for ya if u want?

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-14-2013 Over year old.
Dragon09278

New Heliman

Morgan, Utah - United States

I was worried about parts myself, up until a few weeks ago. Most places started getting flybarless parts in stock again. Doesn't look like CY plans to give up on the 450 just yet.

npsk8ter, you asked me to check the dimensions for 6S batteries. I'm a bit ashamed to admit this, but there were 2 things I didn't think about when designing the battery bay. Velcro and 6S brick packs.

The height of the battery bay is 38mm. This is all well and good for most packs. But I forgot about the added thickness of the velcro. So the max pack size that can be fit is about 36mm tall.

Now for the 6S brick packs, which is what I assume you have. The only way to mount packs this wide will be to either A) remove the frame brace that stretches between the two halves of the battery bay. B) use 10mm spacers instead of the original 5mm spacers. C) Move the frame brace all the way back and run the battery all the way forward.

05-14-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

I have both the bricks and the newer long packs. Most of my bricks are older and dyin off. But when can I test one of these frames out???

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-15-2013 Over year old.
Dragon09278

New Heliman

Morgan, Utah - United States

Hard to say at this point. There are a lot of stages to the process, and the design isn't even done yet. I'll be sending off the design tonight to a few different sites, so I can get an idea of how much it'll cost. Depending on what they tell me I'll decide if it's even feasible to have a few prototypes made.

05-15-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

I will contribute to the cost of one it that will help? I do have a guy who can cut the cf pretty cheap if it would help? I can talk to him about it if you want? He does a lot with cf chassis's and stuff for RC. Just let me kno

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-15-2013 Over year old.
Dragon09278

New Heliman

Morgan, Utah - United States

Depending on the tolerances he can cut it to, that would help a bunch! The tolerances for the prototype would have to be atleast 0.15mm, even better would be 0.10mm. Let me know what he can do.

Don't worry about the cost, I'd rather not accept any money until I can verify the design, and ensure it flys properly without any odd tendencies.

05-15-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

Pm me

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-15-2013 Over year old.
husafreak

Key Veteran

Livermore, NorCal

I should be more specific maybe. About parts availability that is. I have always been able to get parts for my Rave, sometimes it took more than one vendor. It appears that parts will always be available, the Rave 3D has been out for a long time now, but i can still get parts. But back when it was new I remember guys couldn't get FBL kits or they couldn't get the upgrade to go FBL. So sales were lost there. And then the gears were stripping. I myself lost the tail of my Rave when it was brand new and wondered if I had made a mistake buying it, but I got parts and got the mesh correct and since then I never stripped the tail gears in flight. But I also never had a crash or contact with weeds or grass that did not strip the gears. The Rave 3D was never a helicopter that got upgrades, we all expected it to be perfect out of the box. I would love to see a Rave 3D V2 (Ballistic?) Heck it could have a belt driven tail! But if you want to really improve the breed with your frames you gotta fix that tail drive to sell it. Just my 2 cents tho..;

05-15-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

I personally never stripped a tail gear even thru a rough auto which buried the vertical fin in the mud, and also my 1st crash which still didnt strip the gears (yet my 3500g servo stripped and cracked case, tail shaft bent, tt broken, and ripped tail case off the boom) lol and those were the white gears. So honestly, I really won't down the tt gears. Also I think a lot of the gear problem seems to be high head speeds

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-15-2013 Over year old.
husafreak

Key Veteran

Livermore, NorCal

That's cool, good to hear you have had good luck with those gears Wish I could say the same. I wonder why more people don't get Rave's though, they look and fly so good.

05-15-2013 Over year old.
npsk8ter

Senior Heliman

Joliet, Illinois USA

I agree. They fly well. The price was def a bit higher then most 450's but I'd say it was worth it!

T-Rex 700n vbar, Logo 600 vbar, Rave 450 350mm 6s beastX, Devil 480 6s vbar... Need I say more???

05-15-2013 Over year old.
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Rave 3D 450
Notchy main grip bearings even with new bearings...
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