Shubova

My Feedback: (9)

vince.b
Just a little info. Are you saying that you have a gps system in your plane and how does that work. Can you give the model?
What do you mean by “just over 8000 static…?”
What does “also at 50% throttle it works out to 1 oz a minite.” mean? Did you mean “minute?”[sm=72_72.gif]
Thanks,
Shubova
[8D]

Hobbsy

My Feedback: (102)

http://www.horizonhobby.com/Products...ProdID=HAN4500

Shubova

My Feedback: (9)

vince.b
Oops!
Forgot to ask...how did you calculate that 1 oz a minute?
Shubova
[8D]

sodbuster 1

Hobbsy,
Why all synthetic on the 1.15?
Thought Saito's really needed some Castor?

balsaeater

When I was running in my Saito 180 on bench test
with 20 onz tank on ~half gas the fuel tank lasted ~20 minutes
so I figured half gas = 1 onz per minute

The Instruction book say ~55cc per minute = ~1.9 onz per minute WOT

mine is low nitro 5%

However on the Sundowner due to to the high 30% nitro used with the Heli fuel
I suspect that extrapoatling these figures

WOT for a 180 will be more like ~2.5onz (ball park guestimate)

and a 220 would be closer to ~3 onz per minute (ball park guestimate)

so it would be cheaper to keep high speed runs short and line up for runs on half gas

This is due to the Stomic burn ratio of nitromethane being ~2:1 compared to methanol ~8.1 (means nitro burns ~4 times more volume than methanol and at 30% means nearly ~double the fuel per minute than pure methanol and then factor in oil component )

Balsaeater

Hobbsy

My Feedback: (102)

Sod, a friend had two cases of the stuff and I'd been wanting to try it, so far I've run it in the 1.00, the 1.15 and the 1.25, there is absolutely no difference in the way the engines run compared to the 15% WildCat with the 18% 80/20 synthetic castor blend. If there is a difference it will be in the long run.

sodbuster 1

gotcha. I thought maybe Saito wanted it running on something else.
Yeah I would agree with you the Castor probably is more for long term metal fatigue, not for running efficiency

Hobbsy

My Feedback: (102)

I only have 4 gallons of the all synthetic so it won't be a factor in the life of my current engines. I have a couple of gallons of 5% WildCat/16% syn/castor blend for my Laser, the rest is equally devided between 10% and 15% nitro all with 18% of the 80/20 blend. In the great scheme of things it doesn't make a whole lot of difference which fuel jug you grab the engines pretty much run the same. I know there are lines set in concrete by some concerning the differences in nitro % but in the real world the differences are pretty fuzzy and indistinct.

Michaelh

My Feedback: (4)

You can get GPS's for your plane,you can even have a tach with it and altimeter go home and download the info on your computer and have a 3D map of where you flew.
Heck they even have telementry now so you can keep an eye on your head temp etc. in the air!

How cool is that? [8D]

http://www.eagletreesystems.com/

Mike

TomTreese

My Feedback: (1)

I have a question as to what engine mounts should be used with large, 1.20 to 1.80, 4-stroke engines. Specificaclly Saito 120, 150, 180.


I Just sent a Saito 180 back because the exhaust pipe and manifold keeps coming(vibrating) loose and it finally stripped the threads in the cylinder head. I read on the Saito site,: http://saito-engines.info/engine_mount.html, That alluminum mounts may be better for the 150's and 180's? but those mounts are not the Dubro Dampening type?

I asked the Saito technician today and really didn't get a definite answer.

I just found an article in December 06 Model Airplane News by Chris Chianelli that states: "Fiber filled mounts serve to exacerbate the vibration problems intrinsic to 4-strokes simpley because they flex too much and that's what causing the muffler to come loose".

If that is so, why would you want rubber grommets in the mount like the Dubro #688??? Would they add or subtract from the vibration??

This is Important not only for the Venus II I ordered and installing the Saito 150 but also for the Dave Patrick Ultimate taht I'll be reinstalling the 180 on?

Wher do you get a Hyde Mount and will the fit a Saito or just a YS???

Help!!!

Hobbsy

My Feedback: (102)

Tom, because our fourstrokes are light in weight and very strong power pulses, (not just Saitos), you need to hold it still not let it flop around. The only softmount I've found that actually works with a fourstroke is the Davis Diesel soft mounts and they work because you can adjust how firm or soft you want it. Plus, they are easy to install and asjust.

TomTreese

My Feedback: (1)

Hobbsy,
Are you saying that the Fiber compound mount is as good as the Dubro http://www3.towerhobbies.com/cgi-bin...I=LXD633&P=7,?

Where do you get the Davis Diesel mount?

Thanks

Where is Colonial Beach???

sodbuster 1

Hobbsy,
Is it neccesary to use the Cline Regulator on the 1.15?

This is my first 4 stroke glow, have always flown 2 strokes and gassers. It's new to me.

Also, any reason for the bulging tank?????

Hobbsy

My Feedback: (102)

Tom, I'm about 35 miles east of Frederickburg on Route 3, about 1.5 miles from the intersection of Rt3 and 205.

I have never noticed the black fiber filled mounts being flexible. I just about 30 minutes ago i mounted my Saito 1.15 in a Hangar 9 XT 60 and used the provided black mountes. I''l be back.

Here it is. http://www.davisdieseldevelopment.co...iso_mounts.htm

RC Specialties

Hobbsy,

I too have used the fiber type mounts and have experienced no problems. I have stayed away from the flexible mounts. I prefer a more rigid mounting. My opinion!

Jim

TomTreese

My Feedback: (1)

I have six Saito's. A 72 on a H-9 cub, a 100 on a H-9 Hellcat, a 125 on a Seagull edge, The 150 was on a Aeroworks Yak till it had an argument with the runway and lost last week and the 180 on The DP Ultimate. A 120 from a GP Stearman in a box.

They have all been on the stock filled fiber mounts with out incident except for any engine I put on the Ultimate??? The 150 and 180 muffler wants to come loose on that plane???

Saito service just put a new cylinder head on the 180 because the threads where the exhaust manifold goes were stripped.

I'm just trying to stop the problem??

vince.b

My Feedback: (1)

the plane is a Hanger 9 sundowner, its a scale f1 pylon racer. the winsapn is 80.5"
the gps is just a garmon 60csx handheld.
the fuel flow was a close @ 1 oz a minute. most of my flying is down at half stick or 50% throttle.
my flight timer is 12 min and the tank is 22oz and when i land its almost always half empty.
I have a foam mount in a 2nd canopy for the gps.
just over 8000 static means this is the rpm on the ground... as when the plane is at speed i have no idea what the engine rpm unloads to in the air. I hope to get an onboard rpm reading someday.
saito also recomends 100% syn.

Capt Lou

Tom:

I have used the Dave Brown fiber filled mounts on a Saito FA-65, FA-91, and an FA-100. They are easy to work with, align nicely, are easy to mount with a Saito. I have had no issues with them.

TomTreese

My Feedback: (1)

The small ones , up through the 125 haven't been a problem. It's the 150 and 180. Or it could just be the way it's mounted on the Ultimate??

All the mounts I have are the Nylon reinforced with graphite type.

Shubova

My Feedback: (9)

TomTreese,
I was having the same problem with my muffler vibrating loose...my solution was to use Loctite 242 (threadlocker) and it actually worked. It is the blue medium strength; the red is high strength so I would think it was be even stronger. I have been using Loctite on various parts of my planes like the screws that attach the engine mounts to the firewall and on the nut & screws that hold the engine to the mounts, it has held up with success.
Good Luck,
Shubova
[8D]

Hobbsy

My Feedback: (102)

SB, the 1.15 does not really need the Cline, I just like gadgets and the fact that an engine will run perfect from full tank to empty tank when using the Cline or IronBay. The bulge is from the 2 to 12 psi created by the check valve, I've never had a problem with leaky tanks or lines blowing off on YSs nor any engine using the regulators. I stole the velocity from my .56GK for the 1.15, will test run it today so equipped. I don't expect any change.

Capt Lou

Guys:

Be careful with Locktite it works well but you need to know what you are using. Most RC applications use the blue because you can manually break the seal if you need to remove the bolt or threaded part. The red Locktite I believe requires heat application, like a torch, to break the seal. As an alternative, I have read on this thread that people use plumbers teflon thread tape and that this does well on exhaust manifold/muffler applications.

TomTreese

My Feedback: (1)

Capt Lou,

I have read that on several saito sites. I'll try that as well as retighten after the engine is hot. Thanks.

TomTreese

My Feedback: (1)

I that doesn't work I'm getting a couple of these mufflers. Costs less than replacine a cylinder head and it looks and sounds better.

http://www.rcuniverse.com/market/ite...itemId=411691#

I'm also going to put a Bru Line filter on the 150 and 180. Improves fuel efficiency by up to 30%.

balsaeater

I looked up the Bru line Filter at tower search option
http://www3.towerhobbies.com/cgi-bin...=RF&search3=Go
and other links

Apart from the problem to fit to the Saito trumpet air intake I fail to see where 30% fuel reduction can be made

The muffler link infers some fuel saving ???

maybe I missed something ??

Balasaeater