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Hey Bud,
The biggest issue is airframe speeds. The Ripper being a "flattie" can only go so fast and my findings on these seems to limit out at about 80 mph. An airfoil changes all that! The Ripper can do 82 mph with the 5.5x4.5, the 5x5, 4.75x4.75, and the 4.75x5.5, but the perception from the pilot or the ground spectator will see the quicker acceleration of the larger diameter props. Because of the higher thrust of the larger diameter, the plane reaches it's "terminal speed" much quicker, but in reality they all have the same top speed just one looks faster When your speed is airframe limited, go for the lesser pitch props and larger diameter for a more impressive airshow style performance. Throwing all the additional pichspeed at it is just burning amps for the sake of doing it. I think the ideal prop for this plane is the 5.5x4.5. Itjust about reaches it's unloaded state at the top speed of the airframes capability. Best match for best motor and battery performace. If you put a 6x5.5 on there, it wouldn't go any faster, just use more battery |
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Those that don't have a watt meter, get one! They are great tools to help you select the right prop for your plane and motor combo. |
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well, i got 2 more flights in on the mini skyray, this time at 600 ft elevation! yeah, the only way i can describe this thing, is that is just a rush. slow, flast, rediculusly fast, most manuvers are done vertically...huge, HUGE loops, big ol' honkin VERTICAL cuban 8's..sweet diving split S's, inverted, high alfa, just about anything you want to do with it. 70mph loops that go 1,000ft up, top speed is around 110 flat out. dosnt seem to go any faster than that....i guess i need to build another with a air foil, or modify this one sometime. i also flew my "big" super PJ powered ray, and it seemed like a mac truck compared to the small version. the mini ray is insane!
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I have a wattmeter, it peaked out at 18A with the 6x4 so I figure it will be fine with the measurements you guys report. Maybe I'm just not used to a motor this hot.
Thank you for repairing my two previous ones I sent Bob. Anyway, still waiting Scott... please don't make me sacrifice a poor chicken to the Littlescreamer gods in order to get some quick service here. It seems only my PP's have been top notch... but these PJ's are cursed for me. -Chris |
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Chris, you must not be seeing rvincent's replies...he's the LittleScreamer's repair guy (at least for now) and he has been reporting back on your issues and has finished the repairs according to a couple posts ago... RAFster David |
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Chris,
What PJ's did you have? Early lexan I'm guessing? No worries no one will be left out Please just understand huge amounts of stuff on our plates! Like I said all along, If it's thrust you need, the PP with a 6x5.5 is your motor!! If it's pitchspeed you need, then the PJ is your Bullet Again, most of these Park Jets are flatties and will only go so fast. If you intend to fly WOT the whole flight and need a 6" prop, buy the PP. If you want a faster jet, and can use a smaller prop, the PJ is perfect. Airflow is KEY! My 2 cell mini wing uses 22 amps static and I fly it WOT almost the entire time, but it always lands cooler than ambient. Micro jets and Fun Jets have a "dead air" zone in the rear. If you don't insure ducted air to the motor, it's gonna get hot. |
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Chris,
Also on your motor that cooked so fast. I expect the shaft hub cracked and the magnets hit the stator. This is what I usually find, and it means instant toast! We have said many times there was a batch of lexan that went out that was WAY to brittle. The PJ spins up so fast that the knurls were ripping out of the end bell hubs, causing a crack, then an offset which allowed the magets to hit the stator heads. This lead to a HUGE amp spike and cooked windings within a heartbeat! It would go from smooth running hauling butt motor, molten goo in about 5 seconds. |
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?? David, You know something I don't Sounds like I will be out of a job soon |
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Gee Bob, with the manufacturing abroad or maybe here, I just figured you wouldn't be the only waranty support guy forever... moving up to better things, you know...
If the quality is there and people aren't doing things that void the waranty then your work load will go up, with a .5% defect rate on 1000/motors a month you will be seeing 5 motors a month. A 1% defect rate makes that 10 motors/month. So if you sell 3000-4000 motors a month you would see quite a bit of work for one person doing it in his spare time. I didn't know if the factory was doing waranty work or how it is arranged... I hope your job isn't outsourced to China. I had a job in software and it was outsourced to Poland, they tried to do it with India and that attempt failed. Over 2/3rd of that product's development effort is now in Poland and many of my former co-workers are working for someone else now, just like me. When I wrote that, I just knew someone would be picking on that phrase. Sorry about that. RAFster David |
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David, I sent in two other LS motors for repair a while ago. This PJ issue is another motor I had bought directly from Scott back in May. It was supposed to be my one "surefire" as far as obtaining a "cream-of-the-crop" PJ. But, it failed before it could even really begin. Again, this is not related to the motors Bob already repaired. I know you guys have a lot on your plates Bob and Scott, but it just bugs me that this was a brand new PJ from Scott that I payed top dollar for. In addition, I asked him specifically about the brittle batch of Lexan (which I was aware of) and he said the motors in that sale were not affected samples... so I deployed it with confidence. And here I am, with HL order recalled, a defective out of the bag PJ, and a broken rare FunJet that shouldn't have crashed, but did because of this "NIP" motor. I apologize for being the broken record, but I feel like I've been dooped. The visual inspection and smelling preliminarily indicates the motor did not fry... just mechanically failed out of package while safely running completely in manufacturer specs. 3s TP1320 PL 30A ESC 6x4E APC -Chris |
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Video on plane
Bob saw your onboard video flight !!! As Tony the Tiger would say was "GREAT!!!!
Which video cam were you using? Thanks, BLINDFLIGHT |
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Chris,
I'm sorry you feel dooped?? Yes something happened to the PJ that you got from Scott, but dooped would imply you were cheated or lied to?? That is not what you are meaning I hope?? ALL your questions and concerns have been answered and met. The recall has NOTHING to do with you yet as you have not ordered one? The recall at best means a 1 week delay in the recieving of your motor. As for a "RARE" Fun Jet?? There are dozens of them on the shelves of the 2 local hobby shops around here? If you feel the plane was damaged because of the motor failure. Send me pictures and I will replace it. Simple enough. A flame out should not cause a crash unless you are flying in too small an area and there is no room for recovery on an aborted launch. I hope you don't think this is being negative, but I have tried really hard to answer all your concerns and questions only to by asked the same ones over in a different tone and manner. Your motors that I changed for you are not from defects, but specific changes you asked for and I said yes. These are not warranty items just changes you requested. I did this free and not even asked you to pay shipping? This is not a complaint from me, but come on Chris, I/We are working to deliver your goods. We started the recall just for guys like you that want to spin the max sized prop at WOT for the duration of the flight. I want you to be satisfied. Are you going to allow me to do that? Your motors will be on their way home tomorrow. Both 100% as you requested, both 100% accurate in every detail of the winds specified. I only recieved them a week ago and said I would turn around as fast as I could and did. So now I guess I feel dooped?? I did what you asked and requested, but feel I will be killed for doing it? Please be patient through this process of this short time delay in the recall. Most are keeping them anyway. I had the same thing that happened to your PJ from Scott happen the other day at the field with Old Fart. An almost new motor seized in my hand just before I tossed his MJ. Like yours, not fried, just slipping bell and rubbing magnets. If it had happened in the air and we not heard the motor to shut it off, it would have fried. That baby seized tighter than a frog's Butt at 29 phathoms I know these happen and also why Scott and I are working through the issues to insure you guys get the best we can deliver. A few weird issues will appear, but most will have an enjoyable experience. Soon you will enough PJ's that a motor in the repair hangar won't matter Thanks Chris for your patience |
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What Bob doesn't say in his above post, probably because he's the consumate professional (as well as a good friend, and a helluva nice guy) is that he rebuilt the motor in the front seat of his truck!
I've seen Bob spend most of a good "flying day" helping other people rather than fly himself, way too many times.... |
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