19000rpm
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Post by 19000rpm on Feb 10, 2010 6:40:25 GMT -6
That's a nice motor mount for the 35-36C BT. With that you don't have to modify the firewall. The 35 36 is way more power than you'll ever use but it's a very popular motor. You couldn't go wrong there.
The other thing you'll want to look at is a prop. I used the PKZ 9X7.5 on the SC with the PKZ 480. Lots of speed. Flew great at half throttle. That would be similar for the 35-30. You might want a 10, 11 or even 12 prop for optimum thrust.
Happy landings
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BTCat
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Post by BTCat on Feb 10, 2010 8:44:49 GMT -6
Sol, I have a pea brain. Planning for Prop  Not there yet. Too much to think about. Not really (except the pea brain part). I just haven't gotten far enough in my study yet to look into it. I am thinking about that mount you linked to. I think it would do the trick. My only question would be adjusting the thrust angle. Probably easily accomplished with some well placed shims. The other one comes with built in angle. I'll compare price with shipping. If it is close, I'll probably buy the machined one. It will work on either of the HC motors. Yea, 19k, I wondered if that was too much power. I think I am better off sticking with less at this point. Probably buy the 35-30. I need to put this order in pretty soon if I want it. Can't remember when the Chinese holiday season starts. |
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mimir
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Post by mimir on Feb 10, 2010 12:01:55 GMT -6
Man that is a scary story. It's sure hard to do anything but concentrate on the plane when it's in the air. Keeping track of a 5 yr. old is a full time job in itself. And it's those unexpected, impossible to predict accidents, that seem to happen at the wrong time and place. Glad it turned out OK for you. I've dodged a few of those bullets myself. The last one being a wing that folded up over a parking area I was barely skirting. In like a 100mph lawn dart. Bore a hole in the asphalt. Just missed a car and it could have hit anybody unlucky enough to be there at that moment. I don't skirt that parking area anymore. Well then, it's a new wing then and a few parts and you'll be back in the air again? Hope so.  Happy landings Well it did scare me away from flying for 10 years  |
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BTCat
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Post by BTCat on Feb 10, 2010 18:20:36 GMT -6
Well, turns out my original ESC wasn't bad. The cheapo TX was. The company I bought it from sent a new one free. That means I have an airworthy plane for $75.00. Still going to start collecting stuff to convert it. I'll fly it stock for a while and then start playing ;D
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mimir
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Post by mimir on Feb 10, 2010 20:39:14 GMT -6
Cool BT! Let us know how it flys
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Post by Solitaire on Feb 10, 2010 21:07:33 GMT -6
Post up a pic of that baby, BT. Don't keep us in suspenders.  What's the wingspan and AUW on it? |
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BTCat
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Post by BTCat on Feb 10, 2010 21:19:22 GMT -6
Post up a pic of that baby, BT. Don't keep us in suspenders. What's the wingspan and AUW on it? Advertised AUW is ~25 oz. Wingspan is 47.7in I'll post a pic after I "sober up" tomorrow. I get another shot in the spine in the morning Stuff works and the meds they give to "sedate" you are GGGGGRRRRREEEEAAAATTT! ;D |
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19000rpm
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Post by 19000rpm on Feb 11, 2010 7:57:10 GMT -6
Well, turns out my original ESC wasn't bad. The cheapo TX was. The company I bought it from sent a new one free. That means I have an airworthy plane for $75.00. Still going to start collecting stuff to convert it. I'll fly it stock for a while and then start playing ;D Well you can't beat that! I'm in the process of building a mostly stock SC. I just love the way it flys as a three channel. I'll use a 2.4 radio and 3 wire servos, 11.1 battery and either a stock motor or a geared inrunner that I had in the first round of mods in my original SC. Happy landings |
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Post by scarface26 on Feb 11, 2010 12:08:57 GMT -6
I bought one of the machined motor mounts from Custom RC Parts. It is very well made. I am planning to eventually change out all the electronics on my Super Cub and put in a slightly more powerful motor so that I can strap on a 5 Oz. camera for some aerial photography. The stock electronics aren't very high quality according to the experts.
As for power, the rule is to use approx 100 watts of power per lb of airplane to give you pretty aggressive performance. In the Super Cub, this would come to around a 160 watt motor. I figured about 200 watts ought to do it with a camera. The Turnigy 35-36 I believe is 400+ watts. I saw a video with the 35-36 in a Super Cub and it didn't appear to roll across the ground at all on takeoff. It just went airborne, and flew like a barnswallow on speed! That is a lot more than I need.
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BTCat
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Post by BTCat on Feb 11, 2010 13:00:59 GMT -6
Scar, I put in an order for that same mount yesterday. Great minds.... Picked up the link over at RCGroups. I also ordered the 35-30 from HK along with a few extra batteries. My new RX should be here today. The mount should be here sometime next week and the new motor etc. should be here whenever  Snowing today. Maybe this weekend I'll try to put the stock bird in the air. Pardon any typos or nonsense. I'm still a little too high to type ;D |
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Post by r/c basher on Feb 11, 2010 16:41:55 GMT -6
Let us know how the 35-30 works out. Im interested in buying it for my super cub when Im ready to upgrade.
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Post by scarface26 on Feb 11, 2010 17:22:00 GMT -6
Regarding the thrust angle of the motor (3 degrees right, and 3 degrees down - approximately), I think that is already built into the firewall and shims or washers may not be necessary. 19000rpm will know for sure. As for speed, a faster plane just means that I will be able to crash more quickly. I'm not in any hurry.
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BTCat
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Post by BTCat on Feb 11, 2010 18:34:53 GMT -6
Let us know how the 35-30 works out. Im interested in buying it for my super cub when Im ready to upgrade. Will do, RC! |
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BTCat
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Post by BTCat on Feb 11, 2010 18:37:53 GMT -6
Regarding the thrust angle of the motor (3 degrees right, and 3 degrees down - approximately), I think that is already built into the firewall and shims or washers may not be necessary. 19000rpm will know for sure. As for speed, a faster plane just means that I will be able to crash more quickly. I'm not in any hurry. If I read correctly, it should all be built in. And your adage about a faster motor will apply doubly for me, I'm sure. I'm probably going to start on some of the fuselage, wing taping and strengthening soon. Time spent on this might keep it safer longer, too. As long as I don't step on it or something ;D |
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19000rpm
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Post by 19000rpm on Feb 11, 2010 19:26:49 GMT -6
Regarding the thrust angle of the motor (3 degrees right, and 3 degrees down - approximately), I think that is already built into the firewall and shims or washers may not be necessary. 19000rpm will know for sure. As for speed, a faster plane just means that I will be able to crash more quickly. I'm not in any hurry. I maintained the stock thrust angle with all of the brushless motors I've used in the SC. That approach seems to work. I think that motor mount you guys bought is set up for the length of a 35-36 so any variance in overall length of the motor and prop adapter for another motor may require some small adjustment. A couple of hundred watts is plenty for this plane. The wing area is so huge I had to dial in some permanent down elevator to keep it from gaining unintended altitude at above 1/2 throttle with the PKZ 480. The plane with a PKZ 480 had no discernible roll out, it just lept off the ground. Can't imagine it with a 35-36. Probably just hold it in your hand nose up at 3/4 throttle and let it go vertical. Happy landings |
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Not there yet. Too much to think about. Not really (except the pea brain part). I just haven't gotten far enough in my study yet to look into it.
