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Home✈️Aircraft🚁HelicopterThunder TigerOther › R-90 with 680 and 60 tailboom
07-20-2006 07:28 PM  14 years ago
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James Yeram

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Oceanside, CA

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R-90 with 680 and 60 tailboom
just wondering if anyone flies this setup.
I wanted to convert mine but don't want to spend a lot.

I was thinking os 91 sz-h
11 tooth pinion
larger clutchbell 3d clutch (hd)

keeping my tt 680's and stock tailboom.

also I have heard that you should put sideframe stiffners on??
is that a needed part??

thanks for all of your help.

also looking for a os 91 with mp2 for the conversion.
i am willing to trade a traxxas revo for those items.
must be in good condition though.
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07-20-2006 07:41 PM  14 years ago
Wa11banger

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Huntsville, Al

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Your idea and configuration will work.. Here are a few of my perceptions tho..

Parts you want to use
Good motor, and the 11 tooth pinion will be required, also great move putting in the HD 90 clutch and clutch bell because you would be doing it again real soon if you hadn't. if you want to go OS especially with an MPII you are going to also need the 91T main gear. to get into the pipe and make the motor happy. You can fly it on 8.45:1 (93T main) but it will not perform as well as 8.27:1 (93T Main)

680 main blades:
I fly 690's and 710's I have seen other fly 680's with no problem you just lose a little of that "pop" in maneuvers is all but it will fly and perform just fine. Might be more noticeable of a snappy loss during really hot weather.

Short tail boom:
You shouldn't have any problems except you will have to keep short tail blades and you might not have as great of holding power as a longer boom.. My only thinking on this is the further out there you stick the Tail Blades the more "leverage" they have to counteract the torque of the engine, and the other side obviously the shorter tail rotor blades won't have as much bite.

Side frame stiffeners:
There are two schools of thought here, Don't use them because they add 3.7oz's to your AUW.. Use them because they stiffen the lower frame set, they keep the engine head from rubbing on the fan shroud and generating noisy interference.. I run them on all of my birds except one. I have not generated a lock out yet but I have worn the finish off of one of my heads.. This leads me to believe that I am not efficiently getting all of my torque to the head because the frame can flex under torque

Trade stuff:
Sorry I can't help ya out there I fly YS engines but I am sure someone here will have just what you need for that awesome RC truck

Rick
Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team
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07-20-2006 07:55 PM  14 years ago
James Yeram

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Oceanside, CA

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Thanks for your quick reply!!
I also have that carbon bottom stiffner on there so i will skip the side frame stiffeners.
I really need to change to the 90 because it is so god awfull hot over here and at 2500 ft above sea level the air is a little thinner.
I moved from north carolina where i loved my 70 but out here i am having trouble getting the power from the motor.
I am not going to lean it out anymore!! really restricts the 3d manuevers i can do while running the motor at safe needle settings.

91 tooth main gear
11 tooth pinion
and os 91 cmp2
sweet deal.
i also got some sab's 690's so i am set.
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07-21-2006 12:49 AM  14 years ago
luc manseau

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New Liskeard,Canada

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i hope that set-up works,I just bought a ys91,ordered heavy duty cluch and bell,11 tooth pinion,93 main, upper and lower bearing blocks.I'll keep the 680 and stock tail blades.only forgot to get 90 size tank,and more fuel
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07-21-2006 05:54 AM  14 years ago
TECO

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WARWICK RI, USA

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i wanr to do the same on my,
How about motor mount? should i use the stock 60 size?
"Never argue with an idiot - he'll drag you down to his level and beat you with experience
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07-21-2006 12:10 PM  14 years ago
SPB

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Athens - Greece

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You'll definetelly need the 90 tank. YS is a very nice engine but thirsty.
Sotiris
myhelis.com Flying Team
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07-21-2006 02:03 PM  14 years ago
TECO

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WARWICK RI, USA

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I GOT THE TANK ALREADY"Never argue with an idiot - he'll drag you down to his level and beat you with experience
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07-21-2006 05:35 PM  14 years ago
kab1sg

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Richland, Missouri

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Richard,

The R90 standard and the R60 use the same engine mount. So the answer on the mount is yes.

Kenneth
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07-21-2006 05:56 PM  14 years ago
Wa11banger

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Huntsville, Al

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James I moved from your area 1yr and 3 days ago I know what you mean about the heat. I was stationed in RC then when I got out of the military I moved to Cal City and worked with NASA there on Edwards AFB. Then the job moved me here the bottom carbon stiffener does not do the same thing as the side frame stiffeners. But here is a bright side.. and something I forgot to mention, if you have the metal frame set and not the CF frame set the stiffeners aren't really required. When I used to use metal frames I also did not have the stiffener. Also what was mentioned above get the R90 tank its a drop in and very required.. Your 90 will be much hungrier than the 70 was.

Rick
Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team
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07-21-2006 08:36 PM  14 years ago
James Yeram

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Oceanside, CA

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cool i got the metal frames so i should be good.
I don't really go for the carbon stuff except blades.
no need to get the rappy any lighter at least not until i am
good enough to go to the 3d masters

thanks for all the advice guys!
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07-22-2006 03:34 AM  14 years ago
Bo993

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Lake Orion, MI, USA

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R-90 with 680 and 60 tailboom
FYI for you. There was a post a while back on a guy that did a $.99 cent fix on his stock 60 clutch. He had gone through quite a few before he did this. Get a Pepsi can cut it open, lay a new cluth liner on the metal can and trace cut it out so it's just a bit smaller that the new liner. Then after you have cleaned the old clutch liner out, fit the can liner in and clutch liner in, use 30 min epoxy and glue in the tin can liner first then the new clutch liner, wipe out remaining epoxy then take your metal clutch and wrap electrical tape around it 3 times then press it in until the epoxy sets up. I just did this to mine last night because before when I ran the TT70 it would rev up like mad before the clutch would engage, hopefully this will take care or the problem. As for upgrades I just trashed my TT70 in my 60 and did the poor mans upgraded. Bought a YS, changed the pinion to an 11 tooth, kept the stock 93 main spur gear which makes it 8.45 and am keeping the stock 680's on it till I get used to it. As for the YS, one of 2 things makes it not run, lack of fuel or a bad glow plug. (gotta love being pumped) Set the needle rich enough where it smokes like crazy but has good power, then run 4 to 5 gallons through it and then start to lean it out. The power ur gonna get will be awesome from there on out. As for the OS, can't help ya. Good luck
I wondered why the Heli kept getting bigger....then it hit me!
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