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Noobie needs a little engine advise

Old 04-10-2010, 09:25 PM
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scooterinvegas
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Default Noobie needs a little engine advise

I have a HobbiStar 60 with a OS 65 LA. I stumbled acoss a new TT .91 4-Stroke, and was wondering if it would be worth throwing in the HobbiStar 60. Ive never flown a 4 before, and not know what to expect if I put it in the 60. Im waiting for my 4-Star 60 to get here next week, should I just wait to use the TT .91-4 in that?? The .65 LA runs great, but Im the type that likes to be different..

Thanks for any and all input you guys can give me... Scoot


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Old 04-10-2010, 09:31 PM
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jay2000dakota
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Default RE: Noobie needs a little engine advise

I think the 91 would be enough in the hobby star, a 91 is about the same power as a 60 2 stroke. I would want more in the 4 star, a 150 saito would do the trick. I say it better to have too much power than not enough. If your new to 4 strokes, you need to follow the manual for the break in and remember that running max rpm after the break in is not important, I usually go about a 1000 rpm under the factory max.
Old 04-10-2010, 09:36 PM
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jay2000dakota
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Default RE: Noobie needs a little engine advise

If thats a metal motor mount, I would change it to a fiber-reinforced nylon mount. If you crash it you will break the mount instead of the crankcase
Old 04-10-2010, 09:44 PM
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Default RE: Noobie needs a little engine advise

It's not a bad idea to use the trainer as a break in tune up plane for the four stroke, the four stroke is quite a bit more engine then the LA. The metal mount is something that is recommended for four strokes so they don't flex the mount. If you buy a new four stroke mount from any of the manufactures it will be metal. I have used the Saito 100 in the 4* 60 and it's about the perfect combo, the .91 should be just fine.
Old 04-10-2010, 09:47 PM
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Default RE: Noobie needs a little engine advise


ORIGINAL: jay2000dakota

If thats a metal motor mount, I would change it to a fiber-reinforced nylon mount. If you crash it you will break the mount instead of the crankcase
Good point, never thought of that. All three of my Hobbico's have the same mount, so thats something I will look into. Thanks, Scoot

Old 04-10-2010, 11:56 PM
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JohnBuckner
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Default RE: Noobie needs a little engine advise

Don,t waste your first four stroke in the trainer, its already a great combination with the 65LA. Use the fourstroke in a far more appropriate airplane like your four star. Oh, and go ahead and use the metal mount.

John
Old 04-11-2010, 01:26 AM
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Default RE: Noobie needs a little engine advise


JohnBuckner

Don,t waste your first four stroke in the trainer
Too late. It diffidently wasn't a bolt in deal. LA carb was in front with the linkage on the right. TT .91 carb is in back, and linkage is on the left. Pulled the tank, drilled new holes in the bulkhead, remounted the throttle tube and set the carb/servo throws, balanced the 11X10 prop and fired her up. Even at 4500 rpm, it feels like it has more than enough thrust. Sounds cool too.. Will run a couple of more tanks through it tomorrow morning after I get to the dry lake. Scott

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Old 04-11-2010, 02:31 AM
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scooterinvegas
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Default RE: Noobie needs a little engine advise

ok............ I decided running one more tank was more important than my neighbors getting sleep! :-)
Old 04-11-2010, 07:08 AM
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Default RE: Noobie needs a little engine advise

Well that will work fine in that airplane also. Sometime using and old beater for an engine hack to familiarize yourself with new types of engines does have some merit. Have great maiden this morning.

Are you flying at Eldorado lake?

John
Old 04-11-2010, 08:50 AM
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Default RE: Noobie needs a little engine advise

Scooter, pick up a Dubro flex-cable .if your going to install the.91 in your 4 Star, it might come with one, I can not remember for sure. But a flex cable really helpswhen installing the 4 stroke linkages.
Old 04-11-2010, 01:39 PM
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Default RE: Noobie needs a little engine advise


JohnBuckner

Well that will work fine in that airplane also. Sometime using and old beater for an engine hack to familiarize yourself with new types of engines does have some merit. Have great maiden this morning.

Are you flying at Eldorado lake?

John
No maiden this morning...... Left the house, with 0.00 mph wind. Got out to the dry lake around 8am, and it was blowing 15 mph. With in 15 min, the wind was up to 20-25 mph!! I left the dry lake disappointed and disgruntled....

Oh ya, no on Eldorado, went to Apex dry lake, NE of town..

Old 04-11-2010, 03:04 PM
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Default RE: Noobie needs a little engine advise

Yes the whole region is having only a very short morning window with exceptionaly high noon winds. I have a Stinson Tri Motor down here waiting for a maiden now also.

It looks like the region may get back to normal patterns by the middle of next week, I hope.

So Apex is the name, thats what I was looking for and never know the name. Thats the one northeast of town close to the interstate and just the other side of the AF base. I,ve flown at Eldorado, Jean and flown some cross country that terminated at Apex and there seems to be a large more or less permanent line of motorhomes always there on the weekends, even a portable frequency board. Has been a few years since I,ve been there though.

John[8D]
Old 04-11-2010, 08:16 PM
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Default RE: Noobie needs a little engine advise

Not to get off topic , but John, you got a pic of the Tri Motor?
Old 04-11-2010, 08:57 PM
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Default RE: Noobie needs a little engine advise

Hi

3 25AX's, 83" span and 9lb 13oz.
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Old 04-11-2010, 09:06 PM
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Stunning plane!
Old 04-11-2010, 09:23 PM
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Default RE: Noobie needs a little engine advise

Friday was a perfect day at Eldorado!! no wind to speak of and it was 84 in the late afternoon when we left. Could have been out there until dark it was so perfect!! NOw we are back to our normal spring winds. Good time to be working on planes. I needed to run up a couple of planes to do an RF and engine test but it was too windy to be out there in the street fooling around. Went shopping yesterday and it was hard to walk cross wind!!!
Old 04-11-2010, 09:39 PM
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Default RE: Noobie needs a little engine advise

Thanks OKA

GB we tend to be morning people down here and can usually count on good flying wx most days every spring early in the morning. We start trickleing in about sunup and most are gone by 10:00 AM.


Got good news today, Red Lake which is about half way between Las Vegas and Kingman just south of meadview is dry now and flyable. Been waiting to make some flights there from Kingman.

John
Old 04-11-2010, 10:59 PM
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Default RE: Noobie needs a little engine advise

ORIGINAL: jay2000dakota
I would want more in the 4 star, a 150 saito would do the trick.
You recommend a 1.50 for a 4*60? Why?
Old 04-11-2010, 11:08 PM
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Default RE: Noobie needs a little engine advise

The 11x10 may not be enough prop load for the .91 four stroke.
My favorite .91 prop is a 14x6.
You want to keep the rpms around 9,500 to 10,000 (on the ground) at wide open throttle.
Old 04-12-2010, 12:21 AM
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Default RE: Noobie needs a little engine advise


ORIGINAL: JohnBuckner

Thanks OKA

GB we tend to be morning people down here and can usually count on good flying wx most days every spring early in the morning. We start trickleing in about sunup and most are gone by 10:00 AM.


Got good news today, Red Lake which is about half way between Las Vegas and Kingman just south of meadview is dry now and flyable. Been waiting to make some flights there from Kingman.

John
This time of year we start flying about 8 and fly as much as we can unless/until the wind blows us off. Some of us do anyway, my partner and I seem to always be the last to leave for some reason? Summer when it gets hot we are there to watch the sun come up and stay as long as we can take it, most the time we are the last ones there at about 11:30 or so. I have been able to catch the really good days the last couple of times out and that heavy wind they were talking about never came up. Wind got stronger today as the sun went down, it's really ripping right now!!
Old 04-12-2010, 06:12 AM
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Default RE: Noobie needs a little engine advise

Thanks for posting the pics John, once again , nice job !
Old 04-12-2010, 08:11 AM
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Default RE: Noobie needs a little engine advise


ORIGINAL: carrellh

The 11x10 may not be enough prop load for the .91 four stroke.
My favorite .91 prop is a 14x6.
You want to keep the rpms around 9,500 to 10,000 (on the ground) at wide open throttle.
I was thinking the same thing. 11X10 would make for a pretty speedy trainer anyway. I use 13x4's on my Saito 91 for 3D flying, lots of pull and nice, slow landings. You probably want a bit more speed than that, so I think Carrellh's recommendation of a 14x6 is right on.

Good luck
Old 04-12-2010, 08:08 PM
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Default RE: Noobie needs a little engine advise

U got to try a 14x4 on the la 65 sometime.  It will pull 7.5 Lbs.  17mph. vertical.

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