Hyperion HS2221-3000 and Ammo gearbox - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-05-2014, 10:47 AM   #1
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Hyperion HS2221-3000 and Ammo gearbox

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I finally got this set-up flying in a 4m Maxa light short tail that I converted to electric. It isn't the easiest glider to convert to electric. The tail is extremely light, especially on the short tail, so getting the CG in the right place with an electric conversion isn't easy. The fuselage is an awkward shape that requires a 28mm motor. A $300, 100g motor would make it a lot easier, but I decided to go with the $70 combination above.

I removed the two tail servos in the pod, and mounted two MKS 6100 servos in the fin. By removing the two pushrods and housings, two larger digital servos, the elevator bellcrank, the servo platform, the ballast tube, and the nose, I lightened it about 70g. I added back in about 30 g with the two 9g servos, 4 wires (22ga. power, 28ga. signal) from a USB cord, and the firewall. Of course the motor/gearbox (134g), ESC (HK 50A Blue, 50g), and CC BEC (15g), and Altis 4 (8g) add weight. I use the motor battery to power the RC electronics through the BEC

I am using a Vladimir Hyper spinner at the moment, because I like the offset configuration, and that it only weighs 15g. Unfortunately, not all props fold correctly with it, so I am switching to a Precision Z offset spinner from Icare once it arrives. It has a longer yoke that will provide clearance for all my props.

All-up weight for these tests was about 1830g.

After playing with eCalc for awhile, I decided to try 12x6", 12x8", and 13x6.5" props with a 4S, 1000mAh Nanotech 45C battery (122g). I've used that size pack in my Onyx for more than 700 flights (thanks Alex!). I also have 14x9" and 16x8" props to try on 3S, initially with a 1300mAh, 45C Nanotech (122g). With those batteries I have had to add some temporary tail weight. I have some 850mAh, 70C, 3S Thunderpower packs coming, that weigh 75g or so. Those will allow me to remove the tail weight, and get the all-up weight below 1800g.

I tested a few props yesterday in the air. I did ground runs, but I've lost my notes, so I'll repeat those and post the static wattage today.

The climb rate with all three combinations I tried is acceptable, and should be well within the maximum for the motor (600W). The 16x8" HobbyKing carbon on 3S had the best performance at about 10m/sec (eCalc predicts 450W static, 2730g thrust). It was about 15 seconds to 150m. The 12x6" Graupner CAM was about 8m/sec on 4s (eCalc shows 453W, 2188g thrust). The 12x8" HK carbon was about 8.5m/sec on 4S (eCalc 475W, 2660g thrust static).

These were about max rate climbs at very roughly a 30 degree angle. Normally I would climb at a shallower angle to range out more and test the air. Well, normally I rarely climb to even 150m any more. I like to practice F5J, and shut off as low as dare.

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Last edited by kcaldwel; 09-05-2014 at 11:31 AM.
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Old 09-06-2014, 11:11 AM   #2
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Re: Hyperion HS2221-3000 and Ammo gearbox

Thanks for posting that here Kevin, I am still working on mine, should start my test later this week. The motor may be not enough for the overall weight of my glider, but will see, I can use direct drive. I have some more questions but will post those on RCG in your thread, more relevant to what you posted there.
By the way how do you like the Maxa, compare to the Onyx, what all up weight is the Onyx and with what motor? I have kind of Onyx also, but I am keep it stock for TD to learn winching. Lately I also got distracted by throwing a DLG around again, still not sure if it is for me.
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Old 09-06-2014, 12:07 PM   #3
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Re: Hyperion HS2221-3000 and Ammo gearbox

I far prefer direct drive! It is much simpler than these gearbox motors, but they do seem to be quite efficient.

I'm sure the Hyperion is good up to 600W no problem, if you need more power. I don't need to get the Maxa up any faster than 20 seconds to 150m, so 450W seems like plenty and I haven't tried pushing it past that much.

MikeC posted a lower cost gearbox he is using on a Hyperion 2221-3000 with a 13.5x7 prop on 3S:


My Onyx is about 2200g. I have a HobbyKing outrunner in it that I paid $16 for, and it is still going strong at 700+ flights:


I now use a Aeronaut 14x9" prop and HK 1.0Ah, 4S, 45C, Nanotech, 2 flights per charge. I did post on RCCanada about it when I converted it:


I find the Maxa is much easier to thermal than the Onyx. It has more dihedral and a much more effective rudder. The Maxa has a considerably lower span loading and wing loading, so the sink rate and turn radius are both better. And the lower weight makes landings slower and easier to control as well.

I find the Maxa is a very nice glider to fly so far, but it is hard to convert to electric because of the very light tail and fuselage shape. I got mine used out of the Ukraine (ex-F3J world's glider), built very well, and with 6 good JR digital servos for a price I could afford.

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Old 09-07-2014, 05:48 PM   #4
Alex N.
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Re: Hyperion HS2221-3000 and Ammo gearbox

Dan, Kevin flies with older Onyx L version (which is not too bad)) but your Onyx JWS is totally different.
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