[NSRCA-discussion] Did I make a mistake - engine mount ?
Kelly Regan
kelly.regan2 at verizon.net
Sat Oct 7 16:13:44 AKDT 2006
Yes, I spent a lot of time making sure everything was perfect before I
drilled
the mounting holes, it looked so nice and pretty, perfectly square and
straight.
Then I installed the pipe!!! Sometimes I want to kick myself...
I forgot that the pipe would stick way off the side becouse of the right
thrust
built into the firewall! I had to slot the holes and rotate the motor
mount
so the end of the pipe would be at the the center of the pipe tunnel.
But good news is that even with only 2 of the motor mount bolts tight it is
rock solid. The firwall is cross grain balsa with carbon fiber on each side.
I did notice that even the stiff type A Hyde mount flexed a good bit so I
decided to build a nose ring. After about 20 dry fittings the nose ring
mounting ring is glued into the plane and everything looks good to go.
I did notice that the engine needed a little down thrust to be square to
the
nose of the aircraft. I added some 1/16" aircraft ply to the back of
the motor
mount and sanded it from 0 to 1/16" across the back of the mount. That was
just the right amount.
Lance Van Nostrand wrote:
> Yes, you got it. Anthony's reminder is important too if you have a
> honeycomb firewall or crossgrain balsa. Of course, if you are mounting the
> engine for the first time, it is always best to drill the firewall correctly
> and avoid the "oversized washer", but the washer idea doesn't hurt anything.
> Just be sure to tack it in place with some adhesive. Simple squeeze
> pressure will not stand up to the vibration.
>
> --Lance
>
> ----- Original Message -----
> From: "Kelly Regan" <kelly.regan2 at verizon.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Friday, October 06, 2006 1:55 PM
> Subject: Re: [NSRCA-discussion] Did I make a mistake - engine mount ?
>
>
>
>> Lance,
>> I think we are on the same page...
>>
>> Assuming I have the nose ring installed properly I would:
>>
>> 1) Align the motor mount and drill oversize holes in the firewall.
>> 2) Install blind nuts into a plywood ring that that will act as a large
>> washer.
>> 3) Insert the mounting bolts through the engine mount, through the
>> oversize
>> holes in the firewall and into the plywood ring with the blind nuts
>> attached.
>> 4) Tighten the mounting bolts.
>>
>> This traps the firewall between the engine mount and the plywood ring with
>> the blind nuts in it.
>>
>> The minor thrust angle adjustments can be made by loosening the mounting
>> bolts and sliding the rear of the engine mount around a little.
>>
>> Does that sound correct ?
>>
>> Question: Will this work with the stiffer A type mount?
>>
>> Lance Van Nostrand wrote:
>>
>>> Kelly,
>>> If I'm understanding the suggestion, the idea is to flex the mount a bit
>>> by
>>> purposely misaligning the mount and teh nose ring. Not a good idea for
>>> many
>>> reasons. For brevity, I won't list them. If your nose ring is properly
>>> mounted, it will keep the spinner in the right spot. Moveing the back of
>>> the mount around will give you some thrustline adjustment. Several times
>>> I've had to do this. Just knock out the blind nuts and enlarge the mount
>>> holes in the firewall. Make 1/8" a/c ply hole covers with blind nuts in
>>> them and loose mount the mount to them thru the firewall. When you have
>>> the
>>> new alignment, thin CA tack them in place then folllow with epoxy.
>>> You'll
>>> have perfect alignment.
>>> -Lance
>>>
>>> ----- Original Message -----
>>> From: "Kelly Regan" <kelly.regan2 at verizon.net>
>>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>> Sent: Friday, October 06, 2006 12:06 PM
>>> Subject: Re: [NSRCA-discussion] Did I make a mistake - engine mount ?
>>>
>>>
>>>
>>>
>>>> Thank's for the help...
>>>>
>>>> I guess I will use the Type A mount but I think I will add the nose ring
>>>> also.
>>>>
>>>> Now I have another question... I was told I could adjust thrust angle
>>>> by sliding the back of the motor mount around (motor mount bolts
>>>> through the firewall screwed into blind nuts that are attached to
>>>> a plywood ring) if I used a nose ring.
>>>>
>>>> I am assuming that will only work with the more flexible AR type mounts.
>>>>
>>>> With the type A mount it looks like that option is no longer available.
>>>> How
>>>> do I adjust the thrust angle with a type A mount and a nose ring? Do I
>>>> just shim the back of the mount as needed?
>>>>
>>>>
>>>> Joe Lachowski wrote:
>>>>
>>>>
>>>>> I have the Type A in my Brio with a nose ring. My choice. It is a
>>>>> heavier
>>>>> mount than the others, but then again you will need extra weight up
>>>>> front
>>>>> anyway. I have JR 9411's in the rear for elevators. My two cell 2400ma
>>>>> LI-Ion Rx battery is up near the firewall. No need for extra ballast.
>>>>> My
>>>>> plane is the composite version and weighs 10lbs-5ozs AUW with OS 140RX
>>>>> in
>>>>> the nose. I have 172 flights so far on it. I have used the same mount
>>>>> on
>>>>> my
>>>>> Temptations in the past without the nose ring. At this point, I prefer
>>>>> having added the nose ring(Central Hobbies nose ring)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> From: "Mike Darr" <mdarr00 at comcast.net>
>>>>>> Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>>>>>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>>>>> Subject: Re: [NSRCA-discussion] Did I make a mistake - engine mount ?
>>>>>> Date: Wed, 4 Oct 2006 19:31:28 -0400
>>>>>>
>>>>>> A type "A" mount does not require a nose ring. That mount will be
>>>>>> fine
>>>>>> in
>>>>>> the Brio, it will just be a stiffer and offer less vibration
>>>>>> protection
>>>>>> than
>>>>>> an "AR" type mount, or any Hyde mount that requires a nose ring. It
>>>>>> is
>>>>>> up
>>>>>> to you, but I think it will be fine in the Brio. Personally I do not
>>>>>> like
>>>>>> the type "A" mounts because of how stiff they are, but keep in mind
>>>>>> that
>>>>>> I
>>>>>> have all of my mounts custom made by Merle to be very loose. I let
>>>>>> the
>>>>>> engine move around as much as possible without contacting the
>>>>>> airframe.
>>>>>> The
>>>>>> Brio has a large engine bay, which would allow for a lot of engine
>>>>>> movement.
>>>>>> This would allow you to run a very loose engine mount, giving you
>>>>>> maximum
>>>>>> vibration protection.
>>>>>>
>>>>>> A type "A" mount is really designed for a plane with a removable cowl,
>>>>>> which
>>>>>> is an application that you can not install a nose ring. The Type "A"
>>>>>> mount
>>>>>> came out long before Merle came out with the ARI "A" mount which has
>>>>>> the
>>>>>> nose ring incorporated into it. Hope this helps.
>>>>>>
>>>>>> Mike Darr
>>>>>>
>>>>>>
>>>>>>
>>>>>> ----- Original Message -----
>>>>>> From: "Kelly Regan" <kelly.regan2 at verizon.net>
>>>>>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>>>>> Sent: Wednesday, October 04, 2006 6:34 PM
>>>>>> Subject: [NSRCA-discussion] Did I make a mistake - engine mount ?
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> I think I might have made a mistake....
>>>>>>>
>>>>>>> I purchased a slightly used Hyde mount for my OS140 from another
>>>>>>> list member. When it arrived I realized it was a Type A mount...
>>>>>>> For some reason I thought it was a Type AR mount even though the
>>>>>>> seller clearly stated Type A in his email to me. I must be getting
>>>>>>> old!
>>>>>>>
>>>>>>> Anyway is the Type A mount OK for the Brio or should I get the Type
>>>>>>> AR that requires a nose ring?
>>>>>>>
>>>>>>> If it is OK to use the Type A mount should I still use a nose ring
>>>>>>> for
>>>>>>> extra
>>>>>>> support?
>>>>>>>
>>>>>>> Thank's for the help.
>>>>>>>
>>>>>>> ______________________________________________
>>>>>>>
>>>>>>> Kelly Regan
>>>>>>> www.reganbrothers.com
>>>>>>> Home Page: http://mysite.verizon.net/vze6uror/
>>>>>>> ______________________________________________
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> NSRCA-discussion mailing list
>>>>>>> NSRCA-discussion at lists.nsrca.org
>>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>>
>>>>>
>>>>>
>>>> --
>>>> ______________________________________________
>>>>
>>>> Kelly Regan
>>>> www.reganbrothers.com
>>>> Home Page: http://mysite.verizon.net/vze6uror/
>>>> ______________________________________________
>>>>
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>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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>>>>
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>>>
>> --
>> ______________________________________________
>>
>> Kelly Regan
>> www.reganbrothers.com
>> Home Page: http://mysite.verizon.net/vze6uror/
>> ______________________________________________
>>
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>> NSRCA-discussion mailing list
>> NSRCA-discussion at lists.nsrca.org
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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--
______________________________________________
Kelly Regan
www.reganbrothers.com
Home Page: http://mysite.verizon.net/vze6uror/
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