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Gaui EP200 › Battery Discussion
06-04-2009 02:22 AM  9 years agoPost 1
gmcullan

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Southbridge, MA

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I have two ' Rex 250s and a Gaui 200 V2 FES. Because I had the 250s first, I had a number of 800 to 910 three-cell lipo packs that I thought would be good for the Gaui. Now I'm starting to wonder.

Head speed is insanely high, and while the battery and motor temperatures are reasonable after 5 minutes of flying, the ESC is hotter than I'd like.

Another strange thing is that while very stable initially, on a sporatic basis, the 200 becomes very unstable and goes into uncommanded oscilations, primarily in pitch but sometimes in roll. I'm wondering if the higher three-cell voltage somehow causes heat or instability in the Gaui SAS system.

Your thoughts? And have any others had these issues?

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-04-2009 02:30 AM  9 years agoPost 2
MMike

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Holland,Mi-USA

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I run 3S on my TREX250 and 2S on my EP200.

Works well.

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06-04-2009 02:38 AM  9 years agoPost 3
gmcullan

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Southbridge, MA

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Thanks, Mike.

I'll pick up some two-cell packs and give it a try.

It's a nice little heli, isn't it?

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-04-2009 04:35 PM  9 years agoPost 4
Buzzkill2

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Chicago IL

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It's a great little heli!

Drop your pinion to a 10t or 9t and save yourself buying 2S packs. Cheaper and it still has insane power.

Gaui. Good people, Great helis.

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06-04-2009 05:46 PM  9 years agoPost 5
gmcullan

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Southbridge, MA

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Buzzkill2, I checked the parts listing in the Gaui Manual and didn't see a 10 tooth pinion gear other than the stepped gear for the shaft drive version. Is that the one you are talking about. I also checked a couple of the on-line suppliers and same thing, didn't find a 10 tooth pinion.

Could you recommend a specific part or source? PM me if you need too.

Thanks for your help,

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-04-2009 09:07 PM  9 years agoPost 6
Buzzkill2

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Chicago IL

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There's a few places to pick them up at. I'll PM a couple links to ya.

Gaui. Good people, Great helis.

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06-05-2009 12:39 PM  9 years agoPost 7
gmcullan

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Southbridge, MA

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Pinions ordered. Thanks to all for your recommendations.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-06-2009 09:35 PM  9 years agoPost 8
gmcullan

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Southbridge, MA

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The ordered pinions arrived today, but there the pitch is all wrong and they don't mesh at all with the red main gear on the Gaui. I've ordered someg of the dual Gaui pinions, 15/9 and 15/10. However the 9 and 10 tooth sections appear to have a different pitch as compared with the 15 tooth section. If the 15 tooth section is the only section correctly pitched to mate with the main gear, I am no better off as my Gaui arrived with a 15 tooth pinion gear.

Just in case there are no gearing options, I've also ordered some 800 mah 2s1p LiPo packs.

Thank goodness that the supplier I order from is close and has very fast shipping.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-07-2009 05:56 AM  9 years agoPost 9
Buzzkill2

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Chicago IL

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Oh man i checked the link I sent you and (obviously) it was the wrong one. I sent the .5 mod instead of the ,4 mod onion link. I feel like a total a$$. I apologize but, I'm sure it doesn't make you feel better.

Again I apologize. It was an honest mistake

Here's some link's that has the correct size: http://sitesearch.ehobbies.com/resu...p?query=VNR1427
http://www.rcslot.com/pc-radio-cont...rs/VNR1427.html

The right size id 2.3mm .4mod There's a lot of places that have them.

Gaui. Good people, Great helis.

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06-07-2009 02:03 PM  9 years agoPost 10
gmcullan

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Southbridge, MA

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Hey Buzzkill2, don't feel bad. The ordered pinions will find uses in other projects. Thanks for the resend on the links for the pinions with the proper pitch.

Thank you for your help, and with best regards,

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-10-2009 03:19 AM  9 years agoPost 11
gmcullan

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Southbridge, MA

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.4 module pinions are proving difficult to find. They are either discontinued or not available/out of stock.

So keeping with the idea that with the stock gearing, the headspeed was way too high while operating on three cell LiPo packs, I picked up a couple of 800 mah two cell LiPo packs. The lower headspeed is the way to go. Headspeed is still high, now about equal or slightly faster than a stock T-Rex 250 operating on three cells. Motor and ESC temperatures are way down as compared with three cell operation.

There are some downsides. On the three cell packs, I could get up to 6 minutes of flight time. I'd start to get some gyro instability at about 5:30, possibly due to voltage fluctulations under load.

With the two cell packs, flight time appears to drop to 4:30, with gyro instability starting at 4:00 minutes. As such, I've set my DX7 flight timer to 4:00 for this model.

So flight experience with the Gaui 200 V2 FES continues!

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-11-2009 03:27 AM  9 years agoPost 12
gmcullan

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Southbridge, MA

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.4 module pinion stock
OK, call me crazy (You're crazy!!!), no listen!

This whole pinion search is driving me nuts. I'm lucky in that I have a personal machine shop. I found a source of pinion stock, .4 module, 8 through 12 teeth. No problem, only needs to be cut to length and the center hole drilled/reamed.

Over the years I've made plenty of personal slot car, R/C car/plane/heli parts as well as plenty of one-of parts for personal motorcycles and show cars. So now that I found the stock, some personal pinions should be a piece of cake.

It would have been quicker and easier if I could have just bought ready to go pinions. But that is not an option.

These pinions should allow me to use my 3-cell LiPo packs on my Gaui 200 V2 FES and still keep my headspeed in a reasonable range. I flew two 2-cell packs through the Gaui tonight and 4:00 minute flights just do not cut it. The new pinions with the 3-cell packs should put me back at the 6:00 minute flight range.

The stock is coming from off-shore, so it will be a couple of weeks until I can report the success/failure of this project.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-12-2009 05:23 PM  9 years agoPost 13
Picofly

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Helsinki, Finland

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Hyperion 1100 mAh battery & EP200 V2
I just bought some new Hyperion G3 batteries. a 1100 mAh G3 battery actually fits inside the canopy . Wires were way too long and very thick so, I have have cut them shorter. Weight of the battery was 62.7 g with the long wires. Now it is 60.45 g with a JST plug. Weight of the battery will go down to 58 - 59 g If I cut balancer leads shoter and replace Hyperion balace connector with a stadard one. Capasity of the battery is 30% better than a standard 850 mAh one. My heli is a little bit nose heavy with the 1100 mAh battery so I may need to move tail servo further back

I haven't done a test fly yet but I am sure it will be a success !

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06-12-2009 05:26 PM  9 years agoPost 14
gmcullan

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Southbridge, MA

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Picofly, are those 2-cell packs or 3-cell packs?

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-12-2009 08:36 PM  9 years agoPost 15
Picofly

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Helsinki, Finland

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Two cell packs.

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06-17-2009 12:46 PM  9 years agoPost 16
gmcullan

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Southbridge, MA

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The pinion wire has shipped. Hmmm, with a meter length of each coming in, that is one boat-load of pinions I can turn out.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-28-2009 01:07 AM  9 years agoPost 17
gmcullan

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Southbridge, MA

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The pinion wire is here!
The pinion wire arrived today, so of course I had to head to the dungeon, I mean secret workshop. Using the 8-tooth .4 module stock, I quickly had an 8-tooth pinion made for my Gaui.

I've made some other changes to my 200 V2 FES. In a deal with another RR member, I picked up a 200 SD with the three blade head. Of course, not willing to leave well enough alone, I swapped the three blade head onto my V2 FES. This seemed like a good move, as all the electronics were there and ready to go. The mechanical setup on the V2 FES was pretty much spot on and I was comfortable with how it flew.

After just a couple of flights, I'm comfortable stating that the V2 FES, 3-blade head, and three-cell LiPo packs seem to work very well with the 8-tooth pinion. Head speed is very reasonable. Stability is very good. Additional flight testing has been halted this evening due to the currently passing thunder storms and associated downpours.

8 and 12 tooth stock arrived today, The 9 tooth stock is currently not available. 10 and 11 tooth stock will be arriving separately.

Before I start getting a rash of PM's, I will not be selling these pinions directly. There are two very good RR advertisers near where I am. I might see if one or both of them want to offer these pinions.

I will tell you that if you can chase down the right material and have the proper equipment, it is no big deal to make these pinions. And it certainly adds another aspect to the tinkering and experimenting side of this hobby,

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-28-2009 02:55 AM  9 years agoPost 18
gmcullan

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Southbridge, MA

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Still Flying
I've hovered another two packs off in the house. The three-blade head appears to be more stable in flight as compared with the two-blade head. yet still very responsive to control inputs. Nice!

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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06-28-2009 07:07 PM  9 years agoPost 19
gmcullan

rrKey Veteran

Southbridge, MA

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Photos of my 200 V2 FES w/3-blade head
I decided to post some photos of my Gaui 200 V2 FES with the 3-blade head. This is flying quite well. There's plenty of power with the 3-cell LiPo and head speed is spot on with the 8-tooth pinion. It's also let me safely bring my flight times up to 6:00 minutes. (I used 443 mah out of a 800 mah Outrage 3-cell LiPo pack) It's cloudy and gusty here in MA today, so some photos are outside and some are inside. I tried to get a couple of good photos of the new pinion I made yesterday.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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07-01-2009 10:51 PM  9 years agoPost 20
gmcullan

rrKey Veteran

Southbridge, MA

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Stuffed it!
Well, it doesn't look like the photos anymore. I stuffed it in inverted yesterday evening. The overall damage was not too bad. The blade grips stripped out of the center hub and its terminally damaged. The main shaft is bent. The tail rotor shaft is bent and the tail blades are toast. Surprisingly, all three main blades don't appear to have a scratch in them. And other than the spindle screws, the blade grips are OK. Oh, the head linkage was also twisted up pretty good.

I already have it stripped down and repaired with the exception of the main hub. It seems to be out of stock everywhere I've looked.

Anybody know of a location it might still be in inventory?

Oh well, if you fly them you are eventually going to crash them.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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