Sig Kadet Senior engine size

Sig Kadet Senior engine size
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Sig Kadet Senior engine size - 10/17/2007 10:34:00 PM

billym8228

Posts: 31
Joined: 6/26/2007
From: omaha, AR, USA
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Hi everyone,im new here and im going to ask some dumb questions lol.I have been flying for years but never really gotten into r/c the way i am now couldnt afford it lol.I currently have a sig kadet senior when i built this thing about 10 yrs ago i powered it with an os max 40 i think anyway I crashed it on first flight believe it or not all it did was bust the lastin on the windshield and broke the prop,so i took all electronics out including engine and mothballed it,it has been indoors hanging on the wall of my house dusty but still in great shap minus the broken window.anyway this year i got a realflight g3.5 sim man this is awsome i just hope when i put what im learning on this sim to the test i can do it you know.my question is I have 3 4 stroke engines and several 2 cycle glos,if I put a 4 stroke on it what size do I need to put on it and the engine mt seems to me to be setting kinda high on the firewall,i have the orginal plans to the plane that tells all that stuff but its lost somewhere,can someone please help me with this,also need to know what size of prop and pitch.also im scrach building an a-10 warthog from plans I bought from rc modeler mag. it calls for 2 o49 engines in it but those things go wide open or not at all from my experence so what can i use in there place.also im currently putting togather a p-51 mustang arf,how simple can this be ,well it ant and the instructions are crap,I also want to power this with a 4 stroke,never had a 4 stroke till recently and i love em they are wicked,I now have 3 a sato fa50,saitofa65,both new and hemihead design,i know what that means on a chrysler motor but a plane engine im not sure but they sound wicked,anyway i also have a os fs 40 surpass,used but a great little engine it actually idles and raps up better than the saito.looks like ive wrote a book sorry.if you can help let me know.thanks Billy

Post #: 1

RE: Sig Kadet Senior engine size - 10/23/2007 10:36:09 PM

hogflyer

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Joined: 3/23/2005
From: Wichita, KS, USA
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Hi Billy,

For the Kadet Senior, the .40 FP is just not enough power for the plane in todays world. 25 years ago it would have been fine but that's also the power to weight ratio that was flown back then. I'd recommend and OS .46 AX, TT .46 PRO or similar, or the OS .55 AX for a 2-stroke, but the plane will handle a .61 2-stroke with no problems. For a 4-stroke a .61 would be marginal, but an .70 - .82 will work better. For general purposes, a .91 4-stroke will be the equivalent to a .61 2-stroke.

Hogflyer

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Post #: 2

RE: Sig Kadet Senior engine size - 10/24/2007 1:44:24 AM

buzzard bait

Posts: 982
Joined: 1/1/2003
From: Ithaca, NY, USA
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Did the physics of flight change? Your Saito 50 would be perfect on this plane, but if it is not running as well as your OS 40 FS, something is wrong, and it is worth finding out the problem. That is one of the best-loved engines around, and it should have considerably more power than the OS. Jim

(in reply to hogflyer)

Post #: 3

RE: Sig Kadet Senior engine size - 10/24/2007 12:50:17 PM

Tee Bee

Posts: 641
Joined: 2/22/2007
From: Angleton, TX, USA
Status: online

I love my Kadet Senior with it's OS 40LA. Everyone thinks it's too small for this plane but I like it to fly on the wing. Not interested in going vertical. Since my aviation background mostly involves full-scale planes, I like the scale-like performance of this model. Some models really need lots of power but the Senior is happy to loaf around floating on that big fat wing just as happy as it can be. I understand the attraction to the 4 strokes, however. I just installed a .91 in my Four Star 60 and can't wait to fly it.

Here's my Senior:

Attachments

Click to see fullsize image.

Click for fullsize

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Post #: 4

RE: Sig Kadet Senior engine size - 10/24/2007 2:07:28 PM

Gray Beard

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Joined: 4/21/2003
From: Hemderson, NV, USA
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What Tee Bee said, this plane is one of the better floaters on the market. I had A student with one with the OS .46AX and it would loop and roll. The plane is the perfect trainer and fun when you have soloed. Total kick in the wind. The .50 FS would be good on this plane.

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Post #: 5

RE: Sig Kadet Senior engine size - 10/24/2007 5:23:37 PM

JustErik

Posts: 546
Joined: 7/19/2006
From: Charlottesville, VA, USA
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quote:

ORIGINAL: buzzard bait

Did the physics of flight change? Your Saito 50 would be perfect on this plane, but if it is not running as well as your OS 40 FS, something is wrong, and it is worth finding out the problem. That is one of the best-loved engines around, and it should have considerably more power than the OS. Jim

I HATE it when they go and change the laws of physics with no notice!!

Seriously though, I agree on the Saito 50. It would make a great combination.

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Post #: 6

RE: Sig Kadet Senior engine size - 10/24/2007 5:52:40 PM

Bonified Wingnut

Posts: 60
Joined: 8/20/2007
From: Millington, MI, USA
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I saw a video with a Satio FA 65

http://www.rcgroups.com/forums/attachment.php?attachmentid=1315806

Looks like it has plenty of power.

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Post #: 7

RE: Sig Kadet Senior engine size - 10/24/2007 6:01:19 PM

tschuy

Posts: 649
Joined: 7/11/2003
From: Seattle, WA, USA
Status: offline

quote:

ORIGINAL: hogflyer

Hi Billy,

For the Kadet Senior, the .40 FP is just not enough power for the plane in todays world. 25 years ago it would have been fine but that's also the power to weight ratio that was flown back then. I'd recommend and OS .46 AX, TT .46 PRO or similar, or the OS .55 AX for a 2-stroke, but the plane will handle a .61 2-stroke with no problems. For a 4-stroke a .61 would be marginal, but an .70 - .82 will work better. For general purposes, a .91 4-stroke will be the equivalent to a .61 2-stroke.

Hogflyer

I'd have to disagree with this to an extent. The .40 size motor is sufficient for a trainer type model which this is. If you want to throw this thing around and start doing intermediate type aerobatics with a trainer type airplane then yes you'll need a larger engine to pull the vertical maneuvers.

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Post #: 8

RE: Sig Kadet Senior engine size - 10/24/2007 6:31:31 PM

Rcpilot

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Joined: 3/20/2002
From: Arvada, CO, USA
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I put an OS 120 Surpass on a Kadet Senior once. We used it for long distance flying. It held 54oz of fuel and would go non-stop for the 100 mile race with fuel to spare. It was highly modified from stock. Actually, it resembled a Kadet Senior, and thats about it.

The Kadet Senior is a very versatile plane and can be kit bashed into lots of different designs.

I've seen a guy fly the Kadet Senior with a YS 140.

For general training and learning to fly, I'd go with a strong .46 or a .60 size 2-stroke.

If you want to hot dog with it, then go with a .60 size engine for a minimum and up to a 150 4-stroke for unreal power. The airframe is light, but very strong. With some forethought during the building stages, the airframe can be strengthened significantly without much additional weight being added. Thats if you wanted to drastically overpower it.

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Post #: 9

RE: Sig Kadet Senior engine size - 10/24/2007 7:10:00 PM

Al Stein

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Joined: 1/7/2002
From: Johnstown, PA, USA
Status: offline

The manufacturers fly their models before they publish an engine size, and their recommendation aren't usually too bad. SIG manufactured your Kadet and they recommend from a .29 UP TO a .40 size engine.

I've seen many of them fly very well on a mild, plain bearing .40 like the O.S. FP, on the O.S.FS52, nad on the Saito 50 four strokes.

Built well, the airplane will take engines twice as big, but for trainer use you don't need a bigger engine at all.

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Post #: 10

RE: Sig Kadet Senior engine size - 10/25/2007 4:27:44 AM

WMB

Posts: 695
Joined: 10/5/2002
From: Great Falls, MT, USA
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Mine flew great with TT46Pro, 12x4 APC. Tried a Saito 45, 12x5 Zinger for awhile. Flew on the wing, very limited verticle. I have a Saito 65 also and it is the smoooothest engine I've experienced. Works well with 13x6. That is what I would use.
Have fun, MikeB

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Post #: 11

RE: Sig Kadet Senior engine size - 10/25/2007 4:41:22 AM

JCOKEEFE

Posts: 324
Joined: 2/16/2002
From: Fairfield Glade, TN, USA
Status: offline

quote:

ORIGINAL: buzzard bait

Did the physics of flight change? Your Saito 50 would be perfect on this plane, but if it is not running as well as your OS 40 FS, something is wrong, and it is worth finding out the problem. That is one of the best-loved engines around, and it should have considerably more power than the OS. Jim

I agree. Many years ago, the Senior was one of my first builds and I used an OS .48FS for power and it
flew perfectly. Of course, the .48FS has since been replaced by the .52FS, but the point is, that aircraft
doesn't need a larger displacement engine to power it.

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Post #: 12

RE: Sig Kadet Senior engine size - 10/25/2007 5:03:00 AM

vmsguy

Posts: 466
Joined: 4/4/2007
From: Woodville, WI, USA
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I think many have said it already, a .46-ish motor will fly the plane, and for trainer like flying, it will fly it well.

BUT... if you want to get a little more crazy, a .60 will fly it with authority....

At least, that's how I'd sum up the opinions in this thread....

YMMV

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Post #: 13

RE: Sig Kadet Senior engine size - 10/25/2007 11:29:38 AM

bps

Posts: 655
Joined: 10/16/2002
From: Indianapolis, IN, USA
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I have a Saito .82 four stroke on mine I built from a kit and made into a tail dragger. Such a light motor I still had to add nose weight. Plane flies very well and at partial throttle.

Atta