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HomeAircraftFixed-WingMain Discussion › The official plank thread.
03-09-2010 01:54 AM  8 years agoPost 81
BOB WHO?

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Downey, Ca.

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Thanks very much! I appreciate you passing along this info.

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03-12-2010 05:10 AM  8 years agoPost 82
Dblex

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Texas

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just finished my T-45 EDF...

just need to balance and fly

Highly Medicated for your protection......

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03-12-2010 12:35 PM  8 years agoPost 83
tryan02

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Canton, Missouri

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Sweet I love jets love a F-20 tigershark slickest jet ever in my book but the flying of them just seems so boring. Everyone I ever seen fly them just do circles and rolls basic aerobatics not even a split S. Its kept me from getting one just because I love aerobatics. I may have to do it someday just because jets are so cool!!!

Bob Sounds like your motor combo is fine if your puffing batteries your batteries are too low a C rating. That shows your motor prop and ESC are just pulling a monster load. If it was me I would get higher discharge batts and just pull the throttle back when flying.

My Parkzone T-28 trojan is using a Rimfire .10 meaning equivalent to .10 size glow power. Another way to measure confusing people. But as I said before I was looking for watts. The stock Trojan uses a 180-190W motor. The Rimfire is a 430w motor. Hence more power argh argh argh.

430W / 11.1V = 38.7Amps So pick speed controller wisely.

I am using 2100mah lipo 25C so 25 x 2100mah = 52.5Amps I can get from the batery although motor max less than 40. nothing wrong with a little headroom.

As for the prop use what the motor recommends smaller is better so motor doesnt get hot I am using the same prop as with the 200W motor. The little Parkzone trainer airplane now has unlimited vertical at 3/4 throttle.

No Really I am the club President!!!

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03-13-2010 06:47 PM  8 years agoPost 84
BOB WHO?

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Downey, Ca.

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I think that my battery puffing (1 battery) might have been due to the fact that that battery had been crashed hard and kinda smashed the pack a little. I'm using my 3S (450) heli batteries all 25-30C rated batteries. Here's the info on the motor: 490 1140 kv outrunner- weight 119g- for 3D park flyers 30-40oz- props from 10x7-12x6- esc required 25-45amp- up to 450 watts. Those specs were on a sheet that came with the motor. I'm using from a 8x6 to a 10x8 prop. Does that sound Ok tryan? Watts are amps x volts? Remember that electronics is not my field so please don't assume that I understand. Thanks.

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03-13-2010 10:46 PM  8 years agoPost 85
tryan02

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Canton, Missouri

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Watts are amps x volts?
Yes that is true.

Looks like your setup is fine especially if the prop is pulling the plane around like you want it to. You kind of get a motor you know can fly it by watts per pound then prop the plane somewhere within the motor specs and how you want the plane to fly.

or the inverse watts/volts=amps

450w/11.1v= 40 amp this is the max output of your motor with the biggest prop. So you can figure 40Amp ESC is what you need when you decide you are ready for the big props.

here is the huge list of specs on my motor on a 9.5 x 7.5 prop. Its smaller diameter but more pitch so it is close enough to the 10x4.5. You cant over rev an electric motor like you can a gas so smaller is OK.
Motor Diameter: 1.38" (35mm)
Motor Length: 1.18" (30mm)
Shaft Diameter: .16" (4mm)
Shaft Length: .65" (16.5mm)
Lead Length: 3" (76mm)
Connectors: Bullet type, .14" (3.5mm) diameter
Max. Constant Current: 30A
Max. Surge Current: 35A
Max. Constant Watts: 333W
Max. Burst Watts: 390W
No Load Current: 1.2A
Input Voltage: 7.4 - 11.1V (2 - 3S LiPo)
RPM/V (kV Rating): 1250
Weight: 2.5oz (71g)
Suggested Propeller Size: 10x4.5 - 10x7 electric

No Really I am the club President!!!

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03-14-2010 03:56 PM  8 years agoPost 86
BOB WHO?

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Downey, Ca.

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Would your motor be called a 450 or 470 tryan or what? The motor that I am using is heavier (119g) and pulls more juice. I think I'm near the limit of what I can get out of my batteries. BTW I am using an Align 35a esc.

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03-14-2010 07:39 PM  8 years agoPost 87
tryan02

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Canton, Missouri

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I dont know much about the motor classes 300,450,470,480. If memory serves me correctly it was a way of measuring brushed motors but not sure.

My motor in my trojan was a 480-960KV. Now the rimfire I replaced it with is in the same size motor other than a little shorter and lighter with about twice the power.

It is a .10 size equivalent to glow power.

It is also considered a 35,30-1250 that's diameter, length and RPM/volt.
bigger diameter means more power.

I would agree that you may be stressing your batts a bit. Especially if they are older packs. I am using an align 35 amp ESC also.

take the battery mah x C rating = constant draw on a new good battery.

2100mah pack x 20C = 42,000mah or 42Amp constant draw on a battery.

No Really I am the club President!!!

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03-15-2010 04:28 AM  8 years agoPost 88
BOB WHO?

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Downey, Ca.

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I measured the new 'Hoffman Magnetics' 490 motor I put in the T-28. It is 36x34mm and has 1140 rpm/v. I flew it today with no battery problems. 5 min flights and there are at least 3.75 volts per cell left in the batteries. I tried a 9x9, 8x8, and a 9x6 props and liked the 9x9 the best. This motor will pull that plane straight up in a vertical climb until it is difficult for me to see. I would guess that a climb like that will use up lots of mAh. Mostly flew it around 1/2 throttle though. I think the motor is a little too strong for those 450 batteries that I'm using (2250mAh 25+30C) even though they are very good batteries. Remember only 5 min flights. I also got a couple of other motors that are considered a 470 size. One of them is about a 36x25 and 1750 rpm/v. What do you think that higher rpm motor would do in a Trojan and what prop would you recommend tryan?

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03-15-2010 11:59 PM  8 years agoPost 89
tryan02

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Canton, Missouri

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I wouldn't go any bigger KV on the Trojan 1250 is too much thats what I am using. I get 5-7 minutes on a battery at full power also. Seems we are comparable in power.

I have the servos at full throw and when I torque roll it the wings just shutter the plane wants to come apart its not built for twice the power. I have my wings glued and taped on with 3M fiber packing tape and they are still a bit loose from torque rolls.

Want more speed and aerobatic ability? I took the gear off mine many moons ago for performance reasons wheels are unnecessary weight. Made a world of difference.

I have the only trojan at the club that can be launched vertical at 3/4 throttle at full throttle I can climb vertical while rolling. I take it up till I loose orientation kill the throttle then just put it in a downward spin I pull out at the bottom its moving so fast it whistles by you!!!!!
One of them is about a 36x25 and 1750 rpm/v. What do you think that higher rpm motor would do in a Trojan and what prop would you recommend tryan?
That seems to be a smaller motor? with more RPM Dont think I would like that one. I like power over speed hence 3/4 throttle endless vertical. And I wouldnt want to guess what prop to use I would rather get that info from the manufacturer. They have plenty of motors they can try a range of props on a test stand and measure the current to get a range of props.

No Really I am the club President!!!

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03-16-2010 12:16 AM  8 years agoPost 90
92ARedOne

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Cheeseland, WI.-USA

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I glued the wing to the fuse in my T-28. The foam compresses and the screw won't hold anything. Also glued the fuse halves towards the back, where the foam joint line zig zags.

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03-16-2010 02:17 AM  8 years agoPost 91
BOB WHO?

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Downey, Ca.

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There's almost no end to how you can repair and support the wings and fuse on a T-28.

Where I fly the T-28 there is no grass just dirt and asphalt so I need the landing gear. The correct motor/prop combination is still kind of a mystery to me. So with comparable size motors, the lower the KV rating the more torque the motor has? What would the outcome be to install a higher KV motor like say 1500 or 1750 and put a smaller prop?

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03-16-2010 02:40 AM  8 years agoPost 92
tryan02

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Canton, Missouri

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So with comparable size motors, the lower the KV rating the more torque the motor has?
Somewhat yes, lower KV on the same size motor will have more power. Size is everything!
What would the outcome be to install a higher KV motor like say 1500 or 1750 and put a smaller prop?
That would make it a little faster with lower current draw but I dont think you want that on a trojan unless you really know how to use the elevator and bleed off airspeed when landing.

Speed doesnt impress me much I take my trojan up with a 5mph headwind and kill the throttle and get it down doing a harrier landing to about 6ft off the ground completely stalled and can go wide open throttle vertical back up now thats impressive!!!! even if I do say so myself.
There's almost no end to how you can repair and support the wings and fuse on a T-28.
Thats not totally true my fuse (where I hand launch) and wing saddles are ruined soft as a sponge!!!

No Really I am the club President!!!

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03-16-2010 05:26 AM  8 years agoPost 93
BOB WHO?

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Downey, Ca.

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I think your T-28 is probably a little more agile and stronger than mine tryan but I like trying out different combinations. I got about five other motors that I want to try. I also got an mini ultra stick that I haven't built yet and am trying to figure out which motor to use. It is recommended to use a 400 to 450 motor I think. I have these motors that I am considering using. Why don't you put that heavy duty clear 3m tape over the soft spots on the fuse? That'll beef it up.

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03-17-2010 02:13 AM  8 years agoPost 94
tryan02

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Canton, Missouri

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Why don't you put that heavy duty clear 3m tape over the soft spots on the fuse?
the weak spot is right behind the wings where my fingers squeeze the plane. Tape would make it stronger but its not really hurting anything. Just a little hard to hold onto when you go full throttle for hand launch. Oh and dont want any slick surfaces on it landing in wet grass makes the plane slippery and hard to hold on to.

No Really I am the club President!!!

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03-17-2010 06:57 AM  8 years agoPost 95
BOB WHO?

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Downey, Ca.

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Yea but if it were as soft as a sponge I'd pick the lesser of two evils and use the tape. I haven't flown a plane made of balsa wood and covered with plastic only foam planes like a T-28. What are some of the differences?

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03-17-2010 09:51 AM  8 years agoPost 96
Spitfire1

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Perth Australia

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Does anyone have any ideas what I could use a 70mm metal ducted fan system out of an RC lander F16 in thats easy to fly?, it has to use a 3700mah 4s pack and puts out about 1.5 - 1.7 kg of thrust.

I was thinking about a flying wing, but its a quite a large heavy unit specialy with the 3700mah 4s pack.

Ive found the F16 is beyond my skill level, I cant even make it fly in a straight line or turn corners, flown it 3 times and 3 times crashed into the ground, I dont understand as I can fly my f35 joint strike fighter OK and thats also very fast and twitchy, I find once the wings start rolling from left to right with my f16 its all over as I can not regain control, it just spins rapidly.

I dont know what to do with the expensive electronics, trying again with the f16 seems pointless.

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03-17-2010 03:35 PM  8 years agoPost 97
tryan02

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Canton, Missouri

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I haven't flown a plane made of balsa wood and covered with plastic only foam planes like a T-28. What are some of the differences?
The trojan is the only foam plane I have flown. They are tough as nails thats why I am not worried about the soft spots in the foam. All the 3D planes like my Exra 260 are built very light. There are no places you can squeeze it without cracking balsa or running a finger through the covering. You pick up a stick built plane by the wing leading edge (usually strongest part) and support it underneath by the tail. Oh and if you get a stick built nitro or gas plane prepare for a whole different kind of flying. I think foamies are like flying a kite more than a plane. Mainly due to the power to weight ratio you can get by with a lot more crazy stuff than a heavier fuel burner.

Oh and BTW I just built my first engine GF40i from the ground up it was super easy and a lot of fun.

http://www.valleyviewrc.com/CRRC%20...as%20engine.htm

No Really I am the club President!!!

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03-18-2010 12:01 AM  8 years agoPost 98
jwhitacre

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Tarentum,PA- US

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Bought a Magnum 52 4-stroke for my bigger Cub Bee today It won't be a powerhouse by any means but that wasn't the purpose of this build. I will install it tonight and start the break in tomorrow.

Depleting the world of parts, one crash at a time!!

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03-19-2010 12:11 AM  8 years agoPost 99
jwhitacre

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Tarentum,PA- US

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Breaking in the Magnum this evening I'm waiting for it to cool down right now to do another run, and another, and another

Depleting the world of parts, one crash at a time!!

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03-19-2010 01:25 AM  8 years agoPost 100
tryan02

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Canton, Missouri

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OH YEAH!!!!!!

I am waiting till Saturday to break in my 40CC Kit engine I built myself. And I flew my Hangar9 P-47 with Saito 100 that thing is a beauty going through the air!!!!

No Really I am the club President!!!

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HomeAircraftFixed-WingMain Discussion › The official plank thread.
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