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Old 06-08-2017, 09:56 PM   #1 (permalink)
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Default Rush 800

Finally got it all back together, just waiting on some Locktite 609 so I can finish the TT



Hobbywing Flyfun V5 160A HV
KDE XF700 295hv with 16T pinion
3D printed fan mount

I used a Trex 550 pinion modified to fit in the motor mount:



Ran it on the bench and man does the 16T run smoother than a 12T. Way less noise and vibration.

The manual doesn't mention it but the Flyfun V5 HVs have an RPM signal output. I thought I'd have to use an external RPM sensor (Flyfun has no governor so you must use an external FBL gov)

Planning to run at 1600rpm governed, which is exactly KDE's recommendation for governed HS on the 700XF 295kv with 7:1 gearing.
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Old 06-23-2017, 11:57 PM   #2 (permalink)
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Very cool. I've been keeping an eye out for a used 295. What blades are you using?
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Old 06-24-2017, 06:34 PM   #3 (permalink)
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Originally Posted by robertsm View Post
Very cool. I've been keeping an eye out for a used 295. What blades are you using?
Zeal 800mm.

I've ran into a couple problems that are keeping it grounded. When I took the head apart to replace the old style spindle with the new type (that uses M8 nuts) I found that they had turned gummy and lost their elasticity. This is the second set to do this to me so I need to find a replacement before proceeding. Protos Max dampers seem to have the same dimensions (10x17x10) so I've ordered a set of those to try. The hard dampers don't do this just the medium ones. Over time they seem to turn gummy and will crumble apart when you try to remove them from the hub.
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Old 06-25-2017, 03:44 PM   #4 (permalink)
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What are you using for lube on the dampers? I have never had this happen with the soft or firm on my Rush models. I did find out however after trying the mediums and different types of softer dampers that my low rpm head shake got worse with softer dampers (opposite of my previous experience) , actually the hard or firm dampers worked best with my 780 and 766mm main blades and my 1600-1700 rpm range. I use Sil-glyde which is a silicone O-ring and brake part lubricant and assembly lube.
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Old 06-26-2017, 10:31 PM   #5 (permalink)
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Originally Posted by Dennis P View Post
What are you using for lube on the dampers? I have never had this happen with the soft or firm on my Rush models. I did find out however after trying the mediums and different types of softer dampers that my low rpm head shake got worse with softer dampers (opposite of my previous experience) , actually the hard or firm dampers worked best with my 780 and 766mm main blades and my 1600-1700 rpm range. I use Sil-glyde which is a silicone O-ring and brake part lubricant and assembly lube.
I use Super Lube which is supposed to be safe on pretty much all plastics and rubbers save for natural rubber. I found the same issue in a used airframe I got as well when I opened the head.

Protos Max dampers are slightly too short so I'm going to try three 9x17mm Buna o-rings. like how the Logo 700 uses, they should fit perfectly. They are 0.5mm wider than stock (4x3=12mm vs 11.5mm for the stock dampers) but o-rings will compress more than solid dampers)
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Old 06-26-2017, 10:46 PM   #6 (permalink)
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I use Superlube as well, heck I have been using it for 5 years on all of my models. I don't get it, grey dampers or black on the Rush and mine are fine with Superlube. I sold Superlube for almost 15 years, have used it on orings of almost all types and crammed it into dozens of electrical connections, you sure something else isn't up?

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Old 06-29-2017, 04:02 PM   #7 (permalink)
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9x17 o-rings work perfectly with one minor issue that should be easily fixed. The stock 10x15x1mm blade grip spacers sink into the O-ring more than I would like leaving about 0.2mm space between it and the bearing so I have ordered some 10x16x0.1 SAB blade grip spacers to replace them with.


EDIT: Actually I think I'm going to use 10x16x0.5 Mikado spacers instead as they compress the dampers a bit less. Note that in either case the grips have less drag from preload than they did with the stock hard dampers but with the 0.5 spacers they have much less than with the 1mm spacers. If the dampers are too soft then I will switch to the 1mm spacers to compress them a bit more.

(I'm not talking about gritty or notchy grips just normal drag in the bearings from the preload)

Last edited by Atomic Skull; 06-29-2017 at 04:24 PM..
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Old 07-17-2017, 12:50 PM   #8 (permalink)
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What are you guys doing for the tail ratio?
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Old 07-17-2017, 01:33 PM   #9 (permalink)
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What are you guys doing for the tail ratio?
I'm using the stock ratio with a three blade tail. If it's not enough then I will swap out the front drive gear with a 21t Trex 700n front gear (4.9:1 ratio) and auto rotation gear. Unlike with the 700e gear no frame modification is needed for the 700n one.

It looks like Evolution might have discontinued the stretch booms, they've been out of stock since late last year. However I think I can roll my own with a 21mm CF tube and a Trex 800e torque tube. The tube is 0.5mm smaller but with the right size PVC battery shrink wrap over the end it fits solidly in the boom mount. The stock rubber bearing holders won't work (they are squeezed too much and put drag on the bearings) but Gaui X7 ones would because the inside diameter of the 21mm tube is close to the Gaui boom (19mm vs 19.5mm) If the fitment is too loose you could use slightly larger o-rings.

I got the tube here:

http://www.ebay.com/itm/21mm-ODx-19m...53.m2749.l2649

The Trex 800e torque tube is slightly longer than the Rush one, 915mm vs (I recall) 905. This is different than the Trex 700E stretch tt which is shorter. (the Align 700e stretch boom for the 700e is about 1.5cm shorter than the Rush extended boom so if you want to run 800mm blades it won't work)

I have a stock extended boom but I figure it's a good idea to have a replacement ready to go.
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Old 08-11-2017, 11:57 PM   #10 (permalink)
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Quote:
Originally Posted by Dennis P View Post
What are you using for lube on the dampers? I have never had this happen with the soft or firm on my Rush models. I did find out however after trying the mediums and different types of softer dampers that my low rpm head shake got worse with softer dampers (opposite of my previous experience) , actually the hard or firm dampers worked best with my 780 and 766mm main blades and my 1600-1700 rpm range. I use Sil-glyde which is a silicone O-ring and brake part lubricant and assembly lube.
You are right about the head shake with softer dampers, this is weird usually it's the opposite.

Anyway, I was stalled for 3 weeks because the ESC popped on first spoolup and I had to pull it off and sent it back to Hobbywing for warranty repair or replace. The legs on one of the caps had exploded, Hobbywing said they said they couldn't figure out the cause and issued a replacement. Just hovered for the first time earlier today and everything worked fine.

Last edited by Atomic Skull; 08-12-2017 at 12:07 AM..
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Old 08-15-2017, 12:58 AM   #11 (permalink)
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Quote:
Originally Posted by Atomic Skull View Post

It looks like Evolution might have discontinued the stretch booms, they've been out of stock since late last year. However I think I can roll my own with a 21mm CF tube and a Trex 800e torque tube. The tube is 0.5mm smaller but with the right size PVC battery shrink wrap over the end it fits solidly in the boom mount. The stock rubber bearing holders won't work (they are squeezed too much and put drag on the bearings) but Gaui X7 ones would because the inside diameter of the 21mm tube is close to the

The Trex 800e torque tube is slightly longer than the Rush one, 915mm vs (I recall) 905. This is different than the Trex 700E stretch tt which is shorter. (the Align 700e stretch boom for the 700e is about 1.5cm shorter than the Rush extended boom so if you want to run 800mm blades it won't work).
The Boom is 20.4 isnt it, and you bought a 21mm boom?
If Evolution are going to not make anymore stretch booms, i'm thinking of machining my own tail case and front boom mounts to use the trex 800 booms. A chunkier boom would look awesome.
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Old 08-15-2017, 10:03 PM   #12 (permalink)
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Rush boom is 21.5 like the Align one but the clamps can hold a boom as small as 21.3mm

I think I found an acceptable substitute:

Carbon Fiber Roll Wrapped Uni Tube ~ 0.75" ID x 48", Gloss Finish

ID is 0.75 with a 0.045 wall which is 0.84 OD or 21.336 which should clamp securely. This is a mandrel wound tube without the outer twill layer so it has less torsional strength but more hoop strength compared to a twill wrapped tube with a similar wall thickness (this really doesn't matter in this application) I'm pretty sure what these actually are is the twill tubes without the outer twill layer (the 0.75 ID twill finish tubes are 0.875 OD) Also unlike the stock stretch boom which is aluminum core with a twill wrap this is a pure CF boom. This cut to lenght to match the 800E TT would be about 1cm -1.5cm longer than the stock stretch boom.

Note also, you do not want to cut the boom to match the Align 800E boom as the spline and TT protrude from the ends of the boom by a differing amount on the Align and Rush booms You'd need to cut it so the right amout of TT spline sticks out from the ends using a stock Rush boom/TT assembly as a reference.

Also, the ID is smaller than the Rush and Align booms (if you use too small ID boom the rubber will touch the inner race of the bearing and cause drag) so you'd need to use Gaui X7 TT bearing holders instead. (the Gaui boom is very close to 0.75 and the bearing holders use o-rings around a hard plastic holder so you could change them our for slightly different size ones if needed)

Also with a pure CF boom you must NOT over tighten the clamps or it could crack the boom.

Last edited by Atomic Skull; 08-15-2017 at 10:13 PM..
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Old 08-17-2017, 07:50 PM   #13 (permalink)
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Quote:
Originally Posted by Atomic Skull View Post
You are right about the head shake with softer dampers, this is weird usually it's the opposite.

Anyway, I was stalled for 3 weeks because the ESC popped on first spoolup and I had to pull it off and sent it back to Hobbywing for warranty repair or replace. The legs on one of the caps had exploded, Hobbywing said they said they couldn't figure out the cause and issued a replacement. Just hovered for the first time earlier today and everything worked fine.
Well it's not the dampers, I swapped out for harder ones and I'm still getting the shake. I think I need to adjust the cyclic gains or something.
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