90 sized engines
 

Hi Folks
With the increase in popularity in the 90 sized F3a planes. Why arent engine manufacturers responding by making engines for this class of plane.
Other than the OS91 which is not rear exhaust, the MVVS 90 or the YS 110 there is really no choice.

So what do people think should there be more choice. Should the likes of OS build a dedicated F3A 90 sized engine.?

Mike

RE: 90 sized engines
 

Hi Mike,
I'd LOVE to see a .90 sized Hanno Special, but i'm not sure there is enough demand. There are certainly a lot of .90 sized pattern ships out there (kits and ARFs). Webra makes a pumped, rear exhaust .80 with a carb intake muffler. I think they go for about $400. Considering the weight of the YS 110, I'd go with a pumped Webra 1.20 and a wrap around header. MK has two great 90-110 sized pattern kits: the Skystar 90 and the Topstar 110. We just need to let the manufacturersknow what we want!!
-Will B.

RE: 90 sized engines
 

I agree with Will. I'd love to see a rebirth of the Hano in 90-110 size. The best motor evermade in my opinion.

RE: 90 sized engines
 

Maybe I'm in the wrong forum, but I was reading this with interest as I happen to have a Hanno Special with header and pipe...but no model for it. Are there kits available which would suit the Hanno? I was looking at the CA models Widebody 60.
I feel that the Hannno in a suitable model would make a very good Winter Practice model
Eoin

RE: 90 sized engines
 

The Widebody would work and also P. A. C. has several of the 60 size kits. The best flying plane I ever had was a Conquest 7 with the Hano. A Hano with the right prop and pipe is awsome.

RE: 90 sized engines
 

Cast a vote from me as well, would love to see a pumped, rear exhaust 90 size two stroke.

Flywilly...yep, I have seen the Topstar 110 is now out, looks good...may have to add to my kit collection;)


Scott

RE: 90 sized engines
 

Anybody know how the MVVS 91 runs? I had a friend that built a pattern plane using the MVVS 77, it was a little finicky to set up, but turned into a very powerful motor.

RE: 90 sized engines
 

Check out page 31 of the Nationals 2004 issue of Model Aviation.....Kange USA TS .91 AR II for $79.77 An OS Max 90 sized clone for 80 bucks. Folks this is what flying a 90 sized model is all about. Jeff B

RE: 90 sized engines
 

Yeah, a Hanno in a .90 size would ROCK only if they could produce it in the $280 street range. Don't think it would happen.
Maybe this is a place for one of the cheaper producers to step in?

RE: 90 sized engines
 

Hi Eoin,
The Widebody .60 is an excellent airplane (I have one), but my personal preference would be the MK SUper VR-90 or the Skystar 90. MK has stopped kitting the Super VR-90, but there may be kits out there (I'm pretty sure Singapore hobbies still has them). The Skystar .90 would also be a great choice. Build them light and cover with film and they'll fly great with a Hanno.
Tom, I had a Conquest 6 with a Hanno - flew great. I think I had about 650 flights on it! PAC does have some great glass and foam kits, but the box is big and I'd predict that overseas shippikng would be costly.
Happy shopping!
-Will B.

RE: 90 sized engines
 

Will, At that point in time that was as good as it got!
My Epsilon would fly with a Hano and pipe. It is about the same weight as the Conquest was.

RE: 90 sized engines
 

All I have to say is that I am too desperate to have a Hanno special 90 size as I have bought the MK Skystar 90. This machine requires just rear exhaust engine. Singapore Hobbies does have a pumped 61 RFP engine but not the 90.

RE: 90 sized engines
 

The OS 91FX and the (older) SuperTigre g90 are very capable pattern engines, once the modifications are carried out to make them work in a pattern environment.

i.e. pump to allow c.g. mounted fuel tank and a quiet tuned pipe.

I've had first hand experience with both and they're very good.

Having said that, if someone were to offer a piped and pumped motor (as the Hanno was) straight out of the box I'd snap it up.

RE: 90 sized engines
 

has anibody considered jett engines? they have rear exaust and theyare very powerfull

RE: 90 sized engines
 

Webra also have a 91...the Speed 91P5 as far as I know converted from the 91heli version, not rear exhaust [:o]
http://www.webra-austria.at/motor.ph...der=AERO〈=EN
Spec indicate a strong runner.
I am in the marked for a 90pattern plane this winter. My engine choice will most likely be a MVVS91(rear exhaust config) original tuned pipe and header.
My old MVVS 49 has been a strong runner and a trusty friend. If the 91 is as good as the 49 I will be a happy man.
The YS110 is a excellent engine, but I don't like the 20/20 fuel. Nitro is expensive here in Norway The MVVS is happy with 0 or 5% nitro

RE: 90 sized engines
 

Hi Everybody!

I too think that there are alot of airplanes in the market asking for a .90 size engine and the main option for power is the YS 1.10, but i think that YS or OS should develop a two stroke 90 size engine with pump. In my personal opinion i think that there would be alot of market for this engine. I don´t know why YS doesn´t make there helicopters engines for using it for airplanes too!!!!.

I hope OS or YS soon they would make a 90 size engine with pump and maybe rear exhaust!!!!

RE: 90 sized engines
 

Hi Everybody!

I too think that there are alot of airplanes in the market asking for a .90 size engine and the main option for power is the YS 1.10, but i think that YS or OS should develop a two stroke 90 size engine with pump. In my personal opinion i think that there would be alot of market for this engine. I don´t know why YS doesn´t make there helicopters engines for using it for airplanes too!!!!.

I hope OS or YS soon they would make a 90 size engine with pump and maybe rear exhaust!!!!

RE: 90 sized engines
 

Just saw the jett engine webside.They look very crudely made engines. No pump. Looks heavy .I would prefer a OS or a YS in 90 Size.

RE: 90 sized engines
 

Dubb Jett makes one of the finest motors that you can buy. However, they are mainly designed for pylon racing. Their barstock engines are very, very powerful and light.

RE: 90 sized engines
 

Hi Folks
When I started this thread I didnt think I would get such a postitive responce.

Keep the comments coming and who knows maybe the big engine guys might just take note.

Mike

RE: 90 sized engines
 

It is a very good size to manage, both money wise and size wise.

RE: 90 sized engines
 

I think this post to be reffered to the big engine guys then only its possible.

RE: 90 sized engines
 

For this size range I really don´t think you can go wrong with a piped OS 91FX, with a Perry pump if necessary. I have been using one in a Desire 60 as a practice Pattern plane, with pipe pressure off a wrap around header. I am about to put in a Perry, to get a better mid range.
There is a trend in 2m F3A, headed by Bob Pastorelo and others (Aerobob on RCU), towards the OS160FX, with a Perry and pipe, which seems to be getting very good results. So the 91FX is a sort of mini version, if you will.
I have been using the OS140FX with great success for tha past 5 years and am trying out the Mintor 170 at the moment, so I am looking to replicate the power curve of these engines on the 91FX, as far as possible.
Sure, the YS 110 is a good motor, but heavier than the OS 91FX which on a good pipe setup gives the same power, at lower cost.

RE: 90 sized engines
 

How about the Webra P5-91? Is this engine a good choice for the 91 size plane?

RE: 90 sized engines
 

We need a "longstroke" 91 to swing a big prop at a little lower rpm similar to the 4 bangers.

RE: 90 sized engines
 

MVVS .91 - rear or side exhaust , longstroke , develops max horsepower at around
10,000 RPM - lots of low end pull !!!

tommy s

PS: the newest version comes with an updated carburetor which is easier to adjust
and has a very quick and smooth transition from idle to full open.

RE: 90 sized engines
 

that's a good call Tommy. Are there any available yet? Last time I emailed them they were out and didn't know when they would get any. I had to get an OS for my Epsilon.
Tom

RE: 90 sized engines
 

I'm not sure , I noticed Morris Hobbies doesn't even show them on their
web site anymore and they are the US distributor located here in Houston.
I drove out to their location in the Woodlands and picked up one of the new .91's directly
from the owner but that was about 5 months ago. I also picked up a very sweet looking
custom rear exhaust header from him while I was there too. They have a lot of
equipment there that is not on their web site so I would suggest e-mailing them or
calling. They are very nice people to deal with.

tommy s

PS: I still have the new in box .91 with the custom header and the stock MVVS
header and short pipe. I might be talked out of it if you were interested.
Also have a new in box ES Composites carbon fiber tuned pipe for same engine.

RE: 90 sized engines
 

I've seen the OS91FX piped to the proper length turning a 15.25X12APC 4blade at 7800-8000. Yes it isside exhaust and requires the wrap-around header and Yes I'd love to see a rear exhaust "hanno" with the built -in pump BUT it wouldn't be for $199 for sure.

Eddie

RE: 90 sized engines
 

Eddie,

A few days ago, Nat posted on NSRCA list (directed to me and Randy) about the 15.5 x 12 with 25" pipe length. Are you talking about that?
Nat changed to 4-blade? How is the speed with that prop?

Why don't we all get a list of signature and submit to manufacturers for a .91 ~ 1.00 rear exhaust? :D
By the way, OS seems to have problem getting their pumps working (70 Ultamate causes lots of headache for people w/ higher than YS63 price).
I don't care if the manufacturer add pump (costs way too much compared to non pumped engine), but a rear exhaust is good. We can all get a Perry VP 30.:)

IP

RE: 90 sized engines
 

Eddie you're right, the beauty part of the 91FX is that it's a cheap strong motor.

But look at it this way, how much would you pay to have a factory installed pump, header and pipe and rear exhaust?

That's what it comes down to for me.

RE: 90 sized engines
 

Seems to me I read on one of the websites (maybe this one) that the MVVS engines can be configured SE or RE
as long as you do it before you run it in
WW
:D

RE: 90 sized engines
 

Yes, the cylinder bolts onto the crankcase, so can be moved round. But as suggested do this before running in!

RE: 90 sized engines
 

IP
Yes that's what I'm talking about. I remembered it to be a 15.25x12 but if Nat posted it's a 15.5X12 then I stand corrected.

It flies his 2-m VooDoo Express through the entire FAI pattern with authority. Including the humpty with a pos snap on the upline.

Better downline braking and more constant speed overall. Much less tip-noise and with his properly piped setup the sound is amazing. It's quieter than anything else flying (even electric)

Renegade
I think we said the same thing. I'd too love a OS91fx RE but it won't be for $199 (we all know that).
My point was that even though the OS91 is side exhaust, it's still a viable choice AND proped/piped correctly it is a much stronger engine than a lot of people think. Definetely stronger than YS110
Eddie

RE: 90 sized engines
 

Ah, Oh, now you've done it. I'm not sure your allowed to say an OS91 is stronger than a YS 110. That'll get you in trouble.

:D

RE: 90 sized engines
 

How does the MVVS 91 compare with the OS91FX?? I probably should just get the OS, however, I like to try different brands sometimes. Give someone else a shot at my money so to speak. Probably depends a lot on how it is piped. I was thinking of using one of the Jett in-cowl mufflers instead of the stock muffler. Would require less hacking of the cowl and front of the fuse.

RE: 90 sized engines
 

Hi
I have an MVVS 91 but have yet to run it.
It is a very well made engine as it reputed to be an animal if run in carefully.
It is a longer stroke engine than the OS so it should throw a bigger prop.
I am told it is more powerful than the OS .
Do a search and you will find no end of threads on the MVVS and no of them had a bad word to say about the engine.
earlier version had carb problems but this seems to have been addressed.
Bare in mind the MVVS is not some cheap eastern European paper weight they have been in business since the 50s and have won alot of speed titles so they know how to put an engine together.

Mike

ps i am running mine on a pipe and a perry.

RE: 90 sized engines
 

I'm not going to compare the MVVS and the OS but If you haven't run your
MVVS .91 yet you will be amazed at the power this engine has. The earlier ones
did have carb problems but this has been cured on the newer versions. They are
a little hard to start the first time because they are ABC engines and are set up
pretty tight. DO NOT run too much nitro ! They are designed to run great on FAI
fuel which has no nitro and you should never use over 5%. Be extra careful to
keep your fuel filtered as you should on any engine but especially with ABC engines
as dirty fuel plays havoc with compression. These are great engines. I think you would
see more of them except for the fact they are a little hard to get and are not cheap.
I have an Illusion pattern ship which weighs over 9 1/2 lbs and a MVVS .77 pulls it
straight up with no strain , unlimited vertical for as long as you keep the nose pointed up.
In my opinion these are the best 2 strokes I have ever seen.

tommy s

RE: 90 sized engines
 

Thanks for the MVVS info. They are not cheap, however, they cost no more than the OS91FX. (If you don't include Tower's discount coupons.) I think I will give one a try. It's only money...

RE: 90 sized engines
 

If you can't find one let me know. I have one NIB with 3 different headers and
two different pipes.

tommy s