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HomeAircraftHelicopterHelicopter Main Discussion › Anyone had an OS105 in a Stratus?
09-19-2018 11:43 PM  31 days agoPost 1
derekandjennys

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Cedar Rapids, IA

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So my Stratus upgraded from a Tempest and upgraded through the years now has a Whiplash head. I mounted the Maryland Machine fan to a 105 i have had in an N9 for a couple years and was about to bolt it to the bottom plate and they are using smaller 3mm screw on the 105 backplate. So the holes are a little large and I am not sure those 3mm screws are enough. I can't find any pics or mention of a 105 in any Stratus. The 105 also does not have a key for the MM heatshrink fan. And I am noticing most of the the parts still not being available locally.

Air Thunder Lipo

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09-19-2018 11:44 PM  31 days agoPost 2
derekandjennys

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Cedar Rapids, IA

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Also is this forum change the reason I can't find any old info?

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09-20-2018 12:01 AM  31 days agoPost 3
jbjones

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Columbus, Mississippi

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Let us know how this works out. Personally, I believe the key is required for the MM fan. It's "heat shrink", pretty much in name only. The nut is only supposed to be snug, not torqued. So you can't count on that to keep the fan from turning.

I'm pretty sure wjvail machined a key-slot into his 1.05 shaft for his MM fan / Tempest install. This might be an option for you to consider.

I have a YS SR with the MM fan on my Stratus, so I can't comment on the 1.05 install. As always, post some pics man!

Good luck.

Edit: Also, how far down did you put the new hole in your shaft for the Whiplash head? I'm in the midst of doing that conversion to my Stratus also.

J. B. Jones

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09-20-2018 12:07 AM  31 days agoPost 4
helitom

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Pine Grove, Calif, USA

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I just did a search of the Miniature Aircraft section. Try this 4 year old post as a starting point:

https://rc.runryder.com/t754437p1/

The older I get, the fewer things seem worth waiting in line for.

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09-20-2018 04:40 PM  30 days agoPost 5
wjvail

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Meridian, Mississippi

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derekandjennys... I flew a Stratus for a while but I did not care for the model and converted to a Tempest. I found the Stratus to be similar to a Tempest but with a very fussy engine mounting system. I think that is some of what you are going through. I sold the Stratus frame set here on RR to go back to the Tempest.

My Stratus had an OS .91 installed. I never flew it with a 1.05. If I were set on installing a 1.05 w/3mm backblate screws, I might be tempted to re-tap the 1.05 to accept m4 screws. I guess I never noticed OS change the spec on the backplate screws when going from the .91 to 1.05.

I now own two Tempests, both with Maryland Machine fans and both with OS 1.05s.

About the MM fan. There are a few thing MA failed to address for the decades I flew them. The fan mounting was one of them. It was a fussy, error prone and time consuming job. Good news is the MM fan eliminated all that. I have 3 of them installed and all of them are very well balanced and go on perfectly without having to be dial indicated. Unfortunately the MM fan came on the scene just about the time OS stopped including a Woodruff key. You MUST find a way to index the MM fan to the OS crank. I chose to mill a slot in the crank. Rather than install the traditional 1/2 round Woodruff key, I installed a YS key. It was easier for me to machine.

About the FBL head. I converted my Stratus, now Tempest, to FBL. I used a MA122-205 head. I found that after eliminating the washout unit, I was able to re-drill the main mast and lower the head 10mm.

https://www.miniatureaircraftusa.co...-fbl-rotor-head

Like Joey said, let us know how it goes!

"Well, Nothing bad can happen now."

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09-20-2018 05:40 PM  30 days agoPost 6
Dr.Ben

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Richmond, VA, USA

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I would not recommend that engine for that frame. Too many potential vibration issues from the model's engine mounting system. NOT the engine's fault.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-21-2018 02:15 PM  29 days agoPost 7
wjvail

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Meridian, Mississippi

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derekandjennys... I wonder. You said "Stratus upgraded from a Tempest" in post number one. Do you have the ability to go back to the Tempest? Do you still have the Tempest frame set?

"Well, Nothing bad can happen now."

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09-21-2018 03:48 PM  29 days agoPost 8
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

I understand that conversion was on rotor type... Not frame...

He changed stratus rotor assembly by tempest rotor assembly.

/

Saludos cordiales,

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09-21-2018 04:24 PM  29 days agoPost 9
jbjones

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Columbus, Mississippi

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Rojoalfa
I understand that conversion was on rotor type... Not frame...

He changed stratus rotor assembly by tempest rotor assembly.
No, if he's backplate-mounting then it was an entire frame conversion. The Tempest and Stratus frames are very different.

The Rotor head he is using is from the Whiplash (2 blade FBL).

J. B. Jones

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09-22-2018 01:58 AM  28 days agoPost 10
John Benario

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Las Vegas

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Very nice work on the keyway machining.

Team highest quality
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Cool Power fuel
John's Ultimate building school

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09-22-2018 02:14 AM  28 days agoPost 11
wjvail

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Meridian, Mississippi

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John Benario
Very nice work on the keyway machining.
Thanks John. The pictures I posted in post #5 were done on a friends mill that included a very nice DRO. It made the job easy. It was made particularly easy because he mostly did it and I mostly drank beer and added support. Out of the blue, and without consulting me, he sold the mill.

Now I have a very small Taig micro lathe with a milling attachment. I've been able to do a few more cranks using it. It will do the job but it's nothing like having a proper knee mill.

"Well, Nothing bad can happen now."

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09-22-2018 04:07 AM  28 days agoPost 12
John Benario

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Las Vegas

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Get the Taig or Sherline mill!!! I had my Sherline lathe for 10 years before I got the Sherline mill and from day one with the mill I was kicking myself for not getting it 10 years earlier. As much as you love the lathe you will love the mill even more. But you are right, since I got my Clausing 8520 I don't use the Sherline mill much. I use the Sherline lathe constantly even with a South Bend 9 and a South Bend 10, but the Clausing mill is perfect for what we do.

(I have a Tormach CNC mill and it is nice too! But one still needs the manual mill)

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09-22-2018 09:35 PM  28 days agoPost 13
derekandjennys

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Cedar Rapids, IA

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Air Thunder Lipo

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09-22-2018 09:59 PM  28 days agoPost 14
derekandjennys

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Cedar Rapids, IA

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Still have the original fan and most of the Tempest stuff but not the frames, probably sold them. It does have the added frame stiffeners but not using the additional brackets to the motor.
I had a C Spec, Cline, Viper in it that was very strong and preferred over the SR but a cheap bearing I am assuming blew apart in it, but the SR just will not die, it pops and backfires while starting like you would not believe, think gun shots, but after a decade now I can finally tune it.

I have been wanting to upgrade to HV servos and the FBL on the glow helis and also really like the idea of a belt on the motor of the Goblin, just not sure if I love it on the tail yet. Have a Goblin 700 Competition on 14S and other electrics all on NEO. I was liking the N9 on the 105 and VTX blades but lost a small part of a tooth on the crown and I think it is about done unless someone has one. So I though put the 105 and VTX on the Stratus, it does have a better control system for the flybarless, because I never did the Bobby Watts it is 1 to 1 ratio and I really like the 140 CCPM. Down side to the Stratus is the parts, the uniball, and now the motor issues. Had a chance to buy the Goblin Nitro at 719 but decided to upgrade the Stratus.

Upgrading either one of them is not really an option as to run the new stuff I would pretty much need to replace everything, go HV or regulator on the tail and throttle so replace the servos, FBL and go to DMSS receiver. These 2 glow and a QQ 100cc Yak are the last 2 things I have to change out the module for. The 7200 allows me to go switchless and HV on the swash.

May have to wait for Black Friday and get a Goblin Nitro, OS105, Protune pipe, VTX blades, rail tail, ProModeler servos, Ikon HD. Unless anyone can think of anything better.

Air Thunder Lipo

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09-22-2018 10:03 PM  28 days agoPost 15
derekandjennys

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Cedar Rapids, IA

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Oh and 10mm sounds exactly right on lowering the Whiplash head, it was years ago, immediately when the parts were available, I just lowered till the levers were level and its perfect, and added Lunsford titanium links.

Air Thunder Lipo

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09-22-2018 10:18 PM  28 days agoPost 16
derekandjennys

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Cedar Rapids, IA

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And this gear was in the box of parts that came with the N9.

Air Thunder Lipo

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09-22-2018 10:35 PM  28 days agoPost 17
John Benario

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Las Vegas

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If you aren't going to use the crown gear I would like to look at it. I want to see if I can make a crown gear that would be useable, using my gear cutters and an indexer. It won't be a "bevel" gear for the reasons I have described in many previous posts, but I may be able to duplicate it to a useable extent.

Team highest quality
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Cool Power fuel
John's Ultimate building school

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09-24-2018 02:44 AM  26 days agoPost 18
Dr.Ben

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Richmond, VA, USA

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Be careful with the MM fans for those of you that might have them. The hub area was machined at a sharp angle and with way less "meat" than MA used at the center where it transitioned to the body of fan. There was at least one instance of one MM fan exploding while running, blowing a hole right through the cooling shroud. I contacted the mfg and politely asked what he knew about the problem. He instantaneously got very defensive, almost rude, and refunded my money before I even said anything about that, which was pretty much admission of guilt or at least acknowledgement that he knew there was potentially a serious issue. Shortly thereafter the were no longer mfg'd. Pity, they worked very well and a minor mod to design would have made them safer at high rpm.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-25-2018 01:06 AM  25 days agoPost 19
wjvail

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Meridian, Mississippi

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Dr.Ben
Be careful with the MM fans for those of you that might have them. The hub area was machined at a sharp angle and with way less "meat" than MA used at the center where it transitioned to the body of fan.
Ben... I remember some time ago you mentioning that either you personally had a failure, or knew of a Maryland Machine fan failure. I have continued to use my MM fans but cautiously.

My Tempest are now "legacy" helicopters. That is, they are difficult to fly hard expect to repair easily. I still fly them when and as much as I care to but just not as hard or recklessly as I might if they were still in production. For that reason I've "softened" them up a bit. One of those steps has been to limit the head speed to 1,800. With 8.18 gearing and reduced head speed I'm now under 15,000 rpm at the fan.

As an aside, it is educational to go from working on a modern TSA or Align 700 back to a then state-of-the-art X-Cell. Everything on the Tempest looks so fragile and undersized by today's standards. Everything on the X-Cell
from gears, to shafts, to booms and boom braces looks oddly undersized by 2018 standards. I can't help but wonder if any part of them was ever fully comfortable growing into the OS 1.05s they now use.

"Well, Nothing bad can happen now."

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09-25-2018 03:46 AM  25 days agoPost 20
RM3

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Killeen, Texas - USA

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I had a cute blonde in a 2006 Dodge Stratus once... does that count?

showing a preference will only get you into trouble, 90% of everything is crap...

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HomeAircraftHelicopterHelicopter Main Discussion › Anyone had an OS105 in a Stratus?
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