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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › question on power ?
07-30-2007 05:07 AM  13 years ago
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cookie monster

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Los Angeles

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question on power ?
I converted my raptor 50 titan to the 530 body and the problim is after the install i noticed that i have no power. I know that the weight of the heli has changed but it's real slow on pitch. The motor is running rich not hot, i never changed pitch or throw. What do you think it may be?
Miniature Aircraft fury extreme 90 710 radix Y.S 91
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07-30-2007 05:18 AM  13 years ago
flybarless

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Torrington, CT

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servo torque?Just remember -- if the world didn't suck, we would fall off.
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07-30-2007 06:49 AM  13 years ago
cookie monster

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I run the jr 8611a servo's all over... I give it full power and it climb's but it takes some time and the motor sounds slow? Miniature Aircraft fury extreme 90 710 radix Y.S 91
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07-30-2007 02:08 PM  13 years ago
flybarless

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Torrington, CT

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I know with my Hirobo Bell 222 with 90 mechanics, engine tuning and head speed make a big difference, going from 1470 to 1520 made a huge performance difference.
Also remember with a 50, your not really in the power band until the rpm's get up a bit, for scale, you might need to regear to get the motor in the power band and still keep the head speed respectable.
Just remember -- if the world didn't suck, we would fall off.
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07-30-2007 03:19 PM  13 years ago
BarracudaHockey

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Jacksonville FL

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Mine flys just fine at 1700

You are probably running too rich or have your pitch curves off.
Andy
AMA 77227
http://www.jaxrc.com
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07-30-2007 04:23 PM  13 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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what many do not realize (especially when you are new to scale) is that a pod n boom machine will be a bit different when installed in a fuse. there is the additional weight, cooling is a little less efficient, there is probably a power robbing exhaust deflector on it now (and if there was before, it is probably longer now robbing even more power) and now the rotorwash has this big body in the way. for the most part, minimal engine tuning is required. the pitch curves however sometimes and most often is what needs to be adjusted this includes the throttle as well. what i do is first make sure the machine is running happily in pod n boom configuration and that it has plenty of power for fast climbs. after it has been installed in the fuse, if it wont come up off the ground at all, try adding more pitch and throttle at the half stick position. usually, i higher rotorspeed works better for a fuse as the engines power is closer to peek performance there.
another thing to do is to avoid those looong exhaust tubings used to route the exhaust out the fuse. yeah sometimes it cannot be helped but them things rob soo much power. the trick is the keep the diameter form getting any smaller than it already is when it exits the muffler. what i do is run the exhaust out a larger diameter tube and use different size tubings to fill the gap between the muffler opening and the size of the now larger diameter tube it sits in. this creates almost no power robbing back pressure.
cooling is another issue. i know it looks cheesy but leave those rear windows out because thats one of the places the fan will be drawing air from. also make sure the exit air from the fan is big enough. i make sure the hole will expose the whole engine, not just the head. also i learned a little trick from Peter Wales to fill any gap between the top of the heat sink of the engine and the fan shroud with maybe a bit of balsa so the air passes thru the fins of the head and not mostly over them.
so there you have it. the above has worked for me in many cases, hope it will work for yo too.
drive a rotary, fly a rotorcraft
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07-30-2007 11:29 PM  13 years ago
cookie monster

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Los Angeles

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thanks doc and all of you that responded. I will check to see if it's too rich because i richened her up four clicks when i installed the body. It's tail heavy also and i guess that i have to add weight but it seem's so heavy right now. I am running the exhaust the stock way out the side of the rear so nothing has changed on that. I have the govnernor set at 1700 rpm so i may up that a little bit, lean it a few clicks, adjust the pitch curves and try it again. I like the WoW factor with the looks of the body and people seem to enjoy watching it fly. Thanks again everyone Miniature Aircraft fury extreme 90 710 radix Y.S 91
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