 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeDiscussion Groups General ModelsRailroadsRocketsRadio Controlled Air ModelsHelicoptersLand ModelsWater ModelsModelGeeks.com Contact UsLink To UsSearch & Site Map |
Model Forum / Radio Controlled / Air Models / June 2007PT-20 electric conversion...
Building an old PT-20 trainer with my son and decided to convert to electric power so we can fly at the local schoolyard and not annoy the neighbors with the noise of glow power. I've been doing some research and have come up with the following list of motor, ESC etc and was looking for opinions/comments from the more knowledgeable on my "solution": AXI 2820/10 External Rotor Brushless Motor Jeti Advance PLUS 40 Amp Brushless Controller with Program Card 45mm Spinner/Collet Shaft Adapter, 5mm 10x7 APC Prop Radial Mount Set for AXI 2820 and 2826 Series Brushless Motors (Also looking at this motor as it seem to have similar performance specs: PJS 3D 800E Outrunner Brushless Motor) Thunder Power 3S2P 4200 mAh "Pro Lite" 11.1V LiPoly Pack Thunder Power 2-5 Cell LiPo Balancer (Is this necessary? I've got a Triton charger) Or one of the following PQ "Twenty" 3 Cell 11.1V 3700 mAh LiPo Pack PQ 3 Cell 11.1V 4000 mAh LiPo Pack PQ 3 Cell 11.1V 4400 mAh LiPo Pack PQPCM3S PCM GUARD for 3S LiPoly Packs (Again, necessary??) I'm not sold on a particular brand so suggestions for other manufacturers would be appreciated. Thx!! check out www.flyhurricane.com > Building an old PT-20 trainer with my son and decided to convert to > electric power so we can fly at the local schoolyard and not annoy the [quoted text clipped - 36 lines] > > Thx!! >check out www.flyhurricane.com Already did. I'm pretty green when it comes to this electric stuff so the numbers don't tell me a lot. Obviously you're more knowledgeable than I in that you've developed and brought to market those products. Perhaps suggestions of specific Hurricane products that would be good substitutes for the items I listed??? Like I said, I'm not married to any particular brand name.... What kind of warranty (if any) do you offer?? I'd still like to know if I'm on the right track with my choices. I'd hate to spend several hundred dollars and end up with an underpowered model. Conversely, I don't want to bolt on more than I need.. Good point. Give me some data on the airplane also. Wingspan, wing area, flying weight, etc. I'll guide you through it. Jim >>check out www.flyhurricane.com > [quoted text clipped - 9 lines] > hate to spend several hundred dollars and end up with an underpowered > model. Conversely, I don't want to bolt on more than I need.. >Good point. >Give me some data on the airplane also. Wingspan, wing area, flying weight, >etc. I'll guide you through it. >Jim Amazingly, there's no info on the box except for wingpsan and engine size required so I hit up the Great Planes web site for the info: Specifications PT-20 MKII Wingspan: 52.75 in (1340 mm) Wing Area: 515 sq in (33.2 dm2) Weight: 3.5-4.5 lb (1590-2040 g) Wing Loading: 16-20 oz/sq ft (49-61 g/dm2) Fuselage Length: 45.5 in (1160 mm) Rx witll be a Futaba FPR127DF. Elevator & rudder servos will be Futaba FP-S148s. Am going to look at mini servos toactuate each aileron (1 in each wing as I'm not a big fan of the single servo, torque tube method) but those may be the S148s in the end. Again, I'd like to see something in the 11.1v, 4000MAh range for the LiPo battery... I was going to outfit the model with a Magnum XL .25 engine which is probably a lot of power for this model as the box says it'll fly with a .15. The schoolyard where we're fly it does have a decent breeze (5-7mph) pretty much all the time, but it does get stronger some afternoons so power to penetrate the wind would help. (Besides, I don't need to run full out all the time.) Lemme know if ya need more info. Thx! This was my first trainer and it flew great with an FP-15. More than enough power for learning. I would guess that 3000mAh LiPo with a good brushless such as an AXI 2820/10 would be a good starting point.  SignaturePaul McIntosh RC-Bearings.com "when steel just isn't enough" > >>Good point. [quoted text clipped - 34 lines] > > Thx! > This was my first trainer and it flew great with an FP-15. More than enough > power for learning. I would guess that 3000mAh LiPo with a good brushless > such as an AXI 2820/10 would be a good starting point. won't be wrong with that, 3s LIPO 4000 mah as suggested and 11x7 prop.. >This was my first trainer and it flew great with an FP-15. More than enough >power for learning. I would guess that 3000mAh LiPo with a good brushless >such as an AXI 2820/10 would be a good starting point. That's the motor I was looking at after doing some reading and taking some educated guesses at the model's built up weight. Just looking for some more info to reinforce what I found and maybe gain a little more knowledge. >>This was my first trainer and it flew great with an FP-15. More than enough >>power for learning. I would guess that 3000mAh LiPo with a good brushless [quoted text clipped - 4 lines] >for some more info to reinforce what I found and maybe gain a little >more knowledge. Your shopping list looks just fine. The 4 AH LiPo is more than enough, and that's good. Their lifetime is greatly extended by keeping the discharge rate below the vendor's rating, flight time is extended, and the weight difference isn't all that much. The charge guard OR balancer is a good safety measure, but you don't need both. Main difference is the charge guard only detects cell imbalance and shuts down the charge current when 4.2 V is exceeded by any cell, and you have to correct by charging the weaker cells one at a time, while the balancer automatically does this as needed. At this time TP has the proven track record on 3rd generation packs, while the PQ 20's are the new kid on the block, so I'd go with the TP, FWIW. Abel >>>This was my first trainer and it flew great with an FP-15. More than enough >>>power for learning. I would guess that 3000mAh LiPo with a good brushless [quoted text clipped - 17 lines] >while the PQ 20's are the new kid on the block, so I'd go with the TP, >FWIW. I was leaning towards the TP packs as I have yet to read anything bad about 'em. I'd rather spend a few bucks more for a known quality than to skimp and replace more often. Thx for the info.. Think I'll break out the Master Card and start ordering. I've had a PT Electric, original one, that I purchased, and half built back in the 80's, still is intact as if I had purchased it recently The wing was built but not covered, but will do so soon, so I also hav also been looking at ways to mod this electric plane before taking it o its maiden flight. My research so far has not shown much in terms of u to date motor and battery options, but my experience with airplanes o this size tells me that the following equipment should also fly it wit plenty power. Motor: BP 2915-5D Outrunner BL Motor (equiv to a a .30 Glow Eng) Prop: APC 9x7.5E or 10x7E ESC: 45 amp with BEC and LVCO Battery: 3000 - 4000mah 3scell pack 40C (2px3s as option) Eventually I am going to mod the wing for ailerons and go with stearable front wheel, just makes for a nicer controlled model thi way. I'd ike to hear of others that perhaps have modified this electri plane and we just don't know of. Any other options suggestion t equipment, brands, etc, is welcomed. I'm going to continue searchin and see if there is more on the convertion of this electric plane -- Mario 200 |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2012 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.