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Oh...and don't cheep out on your switches...the vibration can kill even a good switch. Good luck... |
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Wow, that's a ton of info and tips I didn't know! Thanks alot guys, this is awesome. What switches do you recommend? And do you all paint/epoxy the motor mount/area inside the cowl, or is that not necessary?
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I read that you're supposed to coat the motor mount area, but also read somewhere on here I think that EF does that in the factory. Is that true or false?
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Boomarc.com has some interesting switches for our brothers that don't or can't use the Powersafe receivers. The wireless key fob switch is very cool! |
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Ok, well I have a Futaba 14sg on the way, I've always flown with Futaba and had good success with them, but was time to upgrade from the 72 mHz. I will look it up, but does futaba have the powersafe receiver, or not?
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They had a 7018 but it was discontinued. |
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You can coat the firewall with thinned epoxy, balsarite, etc. I use automotive engine primer. The newer style planes with CF motor boxes don't need it though.
I fly Futaba too. I'd recommend some kind of battery sharing switch, or a power expander. Powerbox, Smartfly, BoomRC, XPS all make great power expanders. On a 70cc I do like a power expander, but its very hotly debated. The simple solution would be a Wolverine switch from Fromeco https://fromeco-scale-avionics-llc.m...lverine-switch or a AR Multi Switch from Booma http://www.boomarc.com/sw/multi-switch Use two LiPo batteries (2S with 2000-3000mah each) into the battery sharing switch or power expander. Either system will offer a switch that fails to the on position and will isolate the batteries so if one fails it will not drain the other one. You can use a 3rd battery and switch for the ignition if you want to. Powerbox spark switch will allow you to control it from the receiver. The more popular option, and the one I recommend, is to use a Tech Aero IBEC which will allow you to power the ignition from the receiver as well as turn it on and off via the transmitter all without the use of an extra battery. Your 14SG with the included 7008 receiver will do a great job on the Laser! |
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Thanks again for the tons of info guys, y’all have been a huge help already! I was thinking about one of the Smartfly power expanders, one of my buddies likes his. What is the debate on these, are there any negatives on running power expanders? |
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Probably don't need an expander, but if you decide to ..I have one Nib ...also have a NIB Fiber optic ign kill . Holler at me if your interested. I'm not gonna use it... together they cost me $179.00 + shipping.....I'll make you a good deal on it....but like I said , you really could go without it.
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Power expanders...
Group A says they are not needed. They add weight and complexity to a system. They solve a problem that doesn't exsist Group B says they are needed once a plane reaches a certain size. This is typically 50cc+. They provide the power needed by large power servos. Standard servo connectors are limited to 5amps and this is not enough to drive multiple large servos. They provide features and safety required for large models. I'm in group B but many people with years of experience who I greatly respect are in group A. (hi Judge!) |
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Thanks alot for your input everyone! It seems both sides have valid points. I will keep reading and thinking about it. Generally I tend to err on the side of caution, which would say put the power expander in, but on the other hand, if it really is not needed, it's a waste of money. I'll keep dwelling on that ![]() Either way I go, I'm definitely running two batteries. |
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