[NSRCA-discussion] Quick Integral Hacker install question

[Anthony Abdullah]

Thanks Verne, that is tremendously helpful!

I have started tightening down that drive washer and the back of the split bushing (that goes into the drive washer) is solidly against the snap ring, however there is about a 1/8 inch gap between the snap ring and the back of the drive washer (but no gap between the split bushing that fits in the drive washer and the snap ring), is that correct? It would seem like the bushing in the drive washer can not go any further back without pushing through and protruding out the front of the drive washer. But that would also mean that all the force of having everthing tightened down on the prop shaft is only pressed against the bushing and the snap ring via the drive washer. I would think that the drive washer would fit flush against the snap wring witht he split bushing flush against the back and not sticking out the front.

Is that bushing too long? will it fit flush front and back? How much more force will it take to get it all to press together properly? I have already been very persuasive in how much I have torqued it down, I hope I never have to take it off of that shaft!




________________________________
From: Verne Koester <verne at twmi.rr.com>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, July 28, 2009 11:56:43 PM
Subject: Re: [NSRCA-discussion] Quick Integral Hacker install question


Anthony,
First, the easy answer. The drive washer goes up against the snap ring. The ring is in a groove ground into the shaft that prevents it from being pushed back into the bearing. 
 
I use the rear former provided with the Integral which fits perfect if you line the hole with a piece of split fuel tubing. It’s tight so you’ll have to put some spit or a drop of oil to get the motor to slide through. Tight is what you want so don’t make the hole any bigger (ahem).
 
I have no idea how they expect you to use the front pieces. If you mount them to the ply nose ring, the front of the motor will stick out too far. OTOH, they’re WAY too flimsy to use as is. I made a firewall out of 1/8” carbon/end grain balsa that gets mounted about 5/16” behind the ply ring. The motor itself is mounted to .089” carbon plate. The plate is screwed with 3 or 4 4-40’s to the firewall thru aluminum bushed rubber grommets (similar to servo mounting, only bigger) which greatly reduces the sound level. I basically copied Tony Frackowiak’s setup he detailed in the Electric Partner build he wrote up in RC Universe about 5 years ago. Here’s the link: http://www.rcuniverse.com/forum/m_1425422/mpage_1/key_partner/tm.htm  Tony’s write-up and photos explain the method far better than I could explain here.
 
Good Luck!
 
Verne
 
 
 
From:nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Anthony Abdullah
Sent: Tuesday, July 28, 2009 9:47 PM
To: General pattern discussion
Subject: [NSRCA-discussion] Quick Integral Hacker install question
 
I am trying to install a Hacker C50 14XL Comp in an Integral and have a couple of quick questions.
 
1. The Integral kit comes with a number of carbon fiber type mounts designed to be used with the Hacker or similar motor setups. The design is for the front and the rear of the motor to be supported by these formers. The rear one is shaped like a half circle and goes around the back of the Hacker for rear support. There are a couple different ones that could potentially be used up front, one is a circle like a nose ring that could be used and the other is shaped like a diamond and also fits the front of the gearbox and would mount to the hardwood ring on the front of the fuse.
 
The question: Is either of those a "better" option for mounting the front of the motor? It is one or the other correct? Are they made to be doubled up and work together? I only ask because they are extremely light and I want to make sure I have the strength up front that I need.
 
2. There is a C clip on the front of the gear box just in front of the front bearing, Does the press fit drive washer torque down directly on that C clip or is there something that is supposed to go between that clip and the drive washer? I want to make sure before I get to cranking on the drive washer and little split bushing thing and forever press it onto that clip and bind the bearing up so it doesn't spin.
 
 
TIA for any help you can give me concerning installing the Hacker in the Integral.
Anthony
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