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Model Forum / Radio Controlled / Helicopters / June 2007Blade lenght on Lama SA
Hi, next question: Can I put 600mm carbon blades instead of the 550 wooden blades on the 'Lama SA 315' 30 size? That are so only one's I can buy local here. And if yes what would be the different in flying? More difficult or more stable? I like to change the blades because I read this here: http://www.helifreak.com/viewtopic.php?t=16262 Do your guys think that there is realy a need for (to epoxy)? Thanks for help. > Hi, > next question: Can I put 600mm carbon blades instead of the 550 wooden [quoted text clipped - 7 lines] > > Thanks for help. 1. Would 600mm rotor blades fit your 30 size Lama? Maybe! If you still have clearance with your tail rotor you should be Ok. Only way to figure that out is to put one on the rotor head and see if the main and tail rotor disks overlap any at all. If they do, don't fly the 600's. If they don't then go ahead and give them a try. I doubt you'll see much difference in stability. The model will probably feel pretty much the same. Autorotations will probably be easier. What you will need to do is adjust your collective pitch curves. A 30 size engine will have a harder time pulling the larger rotor disk, afterall, these blades are usually run on 50 size birds, and you probably lower your maximum collective setting. Once that's done, it should fly Ok. 2. Do you need to epoxy the root reinforcements on your wood blades? Did you read the first entry on the topic you linked us to? Did you see the picture of the wood blade where the plastic root reinforcement pulled straight out because of centrifugal force? They're not making that up or doctoring up the picture. This can and will happen. I've seen it happen and I know of no faster way to turn a model from a flying dream to a shredded pile of junk. It's not pretty and that doesn't even address the dangers to the pilot and any spectators that may be close by. When that rotor blade departs the hub, it becomes a significant threat to anyone close. So far, the incidents I've witnessed have been lucky! To quote what the first poster said in the link: - Take off the blade ends - Cut off the plastic around the ends (with an exacto knife or razor) so the edges of the plastic will be locked in place when the end is re-installed - Mix a GOOD STRONG epoxy and spread evenly - Make sure to cover the back end of the blade also (keeps them from drying out and cracking) - Re-install the blade ends and screws wiping up any excess epoxy - Let dry COMPLETELY - Balance your blades - Do not run more than 2000 RPM with woodies This is "very" good advise. Ignore it at your own peril!!! Fly Safe, Steve R. >> Hi, >> next question: Can I put 600mm carbon blades instead of the 550 wooden [quoted text clipped - 5 lines] >> http://www.helifreak.com/viewtopic.php?t=16262 >> Do your guys think that there is realy a need for (to epoxy)? >> Thanks for help. > 1. Would 600mm rotor blades fit your 30 size Lama? > Maybe! If you still have clearance with your tail rotor you should be Ok. > Only way to figure that out is to put one on the rotor head and see if the [quoted text clipped - 6 lines] > on 50 size birds, and you probably lower your maximum collective setting. > Once that's done, it should fly Ok. > 2. Do you need to epoxy the root reinforcements on your wood blades? > Did you read the first entry on the topic you linked us to? Did you see the > picture of the wood blade where the plastic root reinforcement pulled [quoted text clipped - 5 lines] > rotor blade departs the hub, it becomes a significant threat to anyone > close. So far, the incidents I've witnessed have been lucky! > To quote what the first poster said in the link: > - Take off the blade ends > - Cut off the plastic around the ends (with an exacto knife or razor) so the [quoted text clipped - 6 lines] > - Balance your blades > - Do not run more than 2000 RPM with woodies > This is "very" good advise. Ignore it at your own peril!!! Hi, and thanks a lot for your followup. Maybe you miss understand me (you sound so upset). I read the advise and like to change the blades more than I like to epoxy (because I than still don't know if I do it the right way and the possibility is still there that the blade(s) f.... of. But thanks to make it now very clear to me. ;) The 600 Blades will come in conflict with the tail-rotor-blades if the main's bend down 6cm, so I guess I can't do it. I don't run a 30size engine, I power the Lama with a electric motor and 6s Lipo. And here we come to the next topic: Today I try to fly the first time (is my first heli I build, so sorry for stupid questions). Everything go well 30cm over the ground with training-gear ;) but after 3 min the Jazz 80-6-18 in heli-mode and Lipo-mode shut down. Tried the next 6s 4000mAh Lipo and the same 3min than Lipo protection of the Jazz powered down. I check and lipo are warm but not hot but the motor pretty hot can't touch. Check the volt on the lipos, first has 23.1V and second 23.3V charger put back on first 1687 mAh and on second 1734 mAh. The Lipos are 'ef-power Lipo 4000 6s 22.2V good for 50A and 70A Brust (I don't know Brust in English) charge up to 4.0A (1C) I only charged with 0.5C tucked about 50min to charge back to 100% 25.200V. So, 3min is much to short flight time, it should 8-10min. First I was thinking friction but I check and it seems all OK and I can't anyhow not adjust the motor to the main-gear and the-main gear to the tail-gear. Can you or anybody give me tip what to do. Maybe reprogram the Jazz (non Lipo-mode) but than I may over-discharge the battery's? > Fly Safe, Yes I will try, thanks and CU Uwe. > Hi, and thanks a lot for your followup. > Maybe you miss understand me (you sound so upset). I read the advise [quoted text clipped - 4 lines] > The 600 Blades will come in conflict with the tail-rotor-blades if the > main's bend down 6cm, so I guess I can't do it. If there's any chance at all that the main blades can hit the tail blades, believe me, they will! I found that out myself a long time ago! :-) Uwe, I'm sorry if I came across to like I was upset. I didn't mean it that way. I've seen several people through the years loose a perfectly good model helicopter because they didn't epoxy the reinforcements to the wood rotor blade like they should. Then the pilot tried to blame the manufacturer for the problem when it was the person who built the model that was a fault. > Can you or anybody give me tip what to do. Maybe reprogram the Jazz > (non Lipo-mode) but than I may over-discharge the battery's? [quoted text clipped - 6 lines] > > Uwe. I'm afraid that I am not familiar with the model you're talking about. Also, I'm just starting to fly electrics and have a LOT to learn about them myself so I will not try to advise you on that point. I hope you can find someone here that can help you with it. Good luck, Steve R. [...] >> The 600 Blades will come in conflict with the tail-rotor-blades if the >> main's bend down 6cm, so I guess I can't do it. > If there's any chance at all that the main blades can hit the tail blades, > believe me, they will! I found that out myself a long time ago! :-) Yes OK, so I have to look for a Internet shop who sale carbon-blades for the Lama. Anybody know a good shop what also have spear-parts (Hirobo Lama SA 315 B 30size) > Uwe, I'm sorry if I came across to like I was upset. I didn't mean it that > way. No worries mate. >I've seen several people through the years loose a perfectly good > model helicopter because they didn't epoxy the reinforcements to the wood > rotor blade like they should. Then the pilot tried to blame the > manufacturer for the problem when it was the person who built the model that > was a fault. I actually was (before I read your comment) tending also to think that. Why the manufactures sale blades that are not OK or were the chances pretty high that some bad happen? I' mean it is not like that the blades and the grips come separate and that there is a advise in the box to better epoxy it. The blades come like this (ready to fly) in the box and only that newbie that have access to Internet and find the right site read about that. >> Can you or anybody give me tip what to do. Maybe reprogram the Jazz >> (non Lipo-mode) but than I may over-discharge the battery's? [...] > I'm afraid that I am not familiar with the model you're talking about. > Also, I'm just starting to fly electrics and have a LOT to learn about them > myself so I will not try to advise you on that point. I hope you can find > someone here that can help you with it. OK, no problem and thanks anyway for answer me. I hope some other can give me a tip for what to look or what to do. > Good luck, same same Uwe  Signatureeverybody crash |
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