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IPS gear setup
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working with those tiny gears & fragile 1.5mm shafts can be a chore.It's real easy to bend or break the shaft,which would render the motor inoperable,I guess we should confirm the kv rating of your Feigao motor,most are 4100kv...so I would recommend ordering one of these http://www.allerc.com/product_info.p...oducts_id=1416 to install it on your Feigao.I have used a numbered or metric dia. drill to make the new pinion a 'light press fit',then apply a drop of green Loctite,line up the gear mesh and then let it dry/cure for 24 hours.Gearboxes are a bit more work but you'll have a new thrusty setup,much more efficient than the brushed IPS. Maybe Doug S. can add a few pointers,I know he likes his 'Moth with geared IPS brushless motor.
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Let me save you a little trouble...Even with a gear puller the whole on the olde pinion becomes enlarged enough to not fit snugly for very long on a new shaft, I have done this several times and even with heavy doses of loctite have had the pinion slip off once the motor and shaft become very hot. Steel and Brass have different expansion and contraction rates this asdds fuel to the fire as well but ...you can buy the GWS pinion pullers at Balsa Products you can also buy new pinion gears there (14 tooth pinion for an "A" gearbox) if you get just the pinion, you'll need a smooth mouth vice to press it on...this part is the easy part Pinions for "A" gear - IPS Drive Gear Pullers and spare pins Chuck ps they have loctite too..and you will still need it |
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Pat Daily, Skypileit, & AirWarriorBelgy - many thanks to you guys for providing immediate guidance on removing and installing gears on the GWS IPS and Feigao motor shafts. I've got my orders placed for the gear pullers, gears, gear box, and Loctite; and already wired up the Feigao motor and a BP 10A ESC.
Neither the ESC nor the Feigao indicate polarity on their lead wires. So, I figured I had a fifty-fifty chance of correctly soldering the three-wire servo connectors I'm using for the motor-ESC connection. Perhaps a good omen; the motor turned in the right direction (See Photo #07). During the first two flights the little Moth scuffed up her lower wing leading edge tips. To reduce future damage in this area I cut two "boomerang" shaped pieces of plastic from the scrap strut material and epoxied them to the lower wing tips (See Photos #05 & 06). Use some medium grade sandpaper to scuff up the side of the bar that you glue to the wing.
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Anyone have any idea of the lifespan I would get on the stock ips motor A gearing (5.86:1) running on a 2s 500mah lipo w/ either a 9x7 or a 10x4.7 prop? I'm setting up a moth for a friend to fly and am planning on initially using the stock ips as mentioned on a 2s lipo. The replacement motors will run me about $11, whereas setting up a brushless system will be ~50-60. I don't mind setting it up bl once this motor goes, just curious what kind of life I can expect from the little guy.
![]() I'm also not really sure what flight times I'd be looking at on the 500 mah pack. I bought the ips heatsink for $0.50, and wouldn't really plan on going over ~10 minutes per flight regardless of ability for the battery to do so. Thanks in advance! -Zero |
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Joined Jun 2005
3,734 Posts
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Zero
My most recent TM with a brushed motor was operational for about 40 hours or so. I have also had some burn out much quicker--like a couple of hours. There is a real charm to the IPS gearbox and motor system in the TM. I have two moths on brushless and they fly forever too and no engine cut out. They do have a bit more power--which kind of negates the charm factor--but still a lot of fun. I would fly my moth with 1200x 2 lipos and get flight times approaching 1 hour, so 500 ma ought to give you good long times. Lately I like 800ma commonsenserc packs--saves some weight and still very long flight times--I often sit in a folding chair, drink a beer and watch the TM cruising in slowly climbing circles late in the evenings. Now that is flying! On several occasions, I would fly two planes (different channels) in formation with each other. Set one up for circles, fly the other. Now that is a hoot! |
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Joined Jul 2006
23,017 Posts
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I run the little gearbox and brushed motor that comes in the kit without a heat sink as the motor always comes down relatively cool with my lazy style of flying. Using a little Castle Creations Pixie 7P brushed ESC and a ThunderPower 2s 480 mAh Li-Po, my lightweight (no modifications) 6.35 ounce Moth flies longer than I care to keep my head turned up. I forget the exact flight times right now. It's probably in an earlier post of mine somewhere, and I don't want to take a chance on giving the wrong flight times. But it's certainly longer than 10 minutes... ![]() Chuck (who can't bear to go brushless with his Pico Moth)
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When I used the Stock motors I would get anywhere from 30 to 50 hours and then some.
Conversely I have had ips motors die after one flight. My Pico Stick FD- 1st Electric plane for me did this, I had one more do it to me on the old Float plane moth. but I can say that in 7 or 8 years I have only gone through 4 or 5 IPS motors 1 on a Pico Stick, 1 on the Green and Yellow Float flyer, and two on the Blue Max. the last Blue max motor lasted almost 3 yrs. I used a TP 2 cell 810 pack, flew at half throttle may a skosh more, for anywhere about 40 to 50 minutes, 1 to 2 flights almost every Sunday and a few other days thrown in here an there. That particular motor was quite robust. 500 mah @ 2 amps should translate into about 15 to 20 minutes at full throttle - full time 2 amps = 2000 mah per hour...just math after that. 500 mah is 25% of 2000 mah (2 amps) This equals 25% of 60 minutes or 15 minutes do alot of climbs and shut downs while gliding to earth or just float around at half throttle and those flight times can become severely elongated Chuck |
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Thanks for the help everyone. Let's hope I have one that lasts more than one flight
. Steve, I honestly totally forgot about possible hc bl upgrades. I was quoting the price for possibly an m-a-e motor/esc and or the inrunner one that sits in the stock ips mount. Did that little hextronik mount right on the ips stick or need a little modding? Brushless for ~$20 is very appealing. -Zero |
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