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Sport Planes (Formerly I/C & Gas Conversion) Discuss I/C or Gas Conversions, Aerobatic Planes and Sport Aircraft

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Old 04-18-2008, 08:01 PM   #1
Henry Sistrunk
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Default Top Flite Contender

Here is my latest conversion.


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Old 04-18-2008, 08:35 PM   #2
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I still have the plans for that downstairs.
Might have to build another one.

What power are you using?

Your Contender looks great.

Paul
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Old 04-19-2008, 01:23 AM   #3
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HENRY -- cool! Was always one of my favorite planes. Check this out:

http://www.rcgroups.com/forums/showthread.php?t=841918

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Old 04-19-2008, 02:11 AM   #4
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Default Top Flite Contender

Paul, The power is an Electrifly 42-50-800 motor with an Electrifly SS60 Esc and an Electrifly 4 cell 3200 battery and an APC 12X6 prop. The system produces 47.56 amps and 668.6 watts. I have not flown the Contender yet but have flown my Falcon 56 with the exact same systen in it.


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Old 04-19-2008, 02:22 AM   #5
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Default Top Flite Contender

btsai. Looks great, Had to look twice to be sure it wasn't a Contender. I built a Contender when they first came out in the 60's and it was powered with a Veco 60 or was it a 61. Anyway it flew great and I wanted to try to convert this one. I did quite a bit of lightening aft of the cg because electric is lighter than glow. Made the top hatch removable for the battery as I hate having to put the battery in from the bottom.
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Old 04-19-2008, 12:30 PM   #6
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Henry, You have great taste in planes.

I just put that Falcon arf together for a friend of mine.
I liked it so much I bought the kit version.
I'm planning on a changing the fuselage construction to be the same as the early Falcon 56.

How's the Falcon fly with that powerplant?

Let us know how the Contender flies as well.
Some air shots would be nice too.

Paul
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Old 04-24-2008, 02:16 PM   #7
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Default TOp Flite Contender

Paul, Both the Contender and the Falcon fly great. Both are overpowered. On the Falcon the wing holddown screws were pulling thru. Washers made out of ply solved this problem. Also see my Voltwatch for keeping tabs on the flight battery.
Henry


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Old 04-25-2008, 11:45 PM   #8
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Default Top Flite Contender.

Changed to a APC 14x7 prop. What a difference. Straight up out of sight, almost. Flies like a 60 or better 2 stroke. No trim required for inverted flight. What a dream ship this conversion has turned out to be.
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Old 04-27-2008, 03:08 PM   #9
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Henry, what did you do to the Cowl on your Contender? No balsa block.

Also, did anyone give any thought to removing the Dihedral <if you can> on the Falcon ARF. Might make it a lot more fun to fly.

Tommy D

P.S. here is my Electric Kaos


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Old 04-27-2008, 03:41 PM   #10
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Default Top Flite Contender

Yours looks good. I never did have one of those. The cowl is made with green floral foam for the mold and panty hose and 30 min epoxy. Really easy to do and is much easier than fiberglas. Since the Falcon is an ARF I can't see removing the dihedral unless gravity does it for me. It flys really good. http://www.rcuniverse.com/community/profile.cfm Check me out here.
Henry
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Old 04-27-2008, 06:44 PM   #11
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What motor do you have in the Kaos?
I have the kit for that as well, just waiting for a good excuse to start it.

Paul
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Old 05-02-2008, 12:36 AM   #12
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Hi Paul

Power 46 on 5S.

1200W

Tommy D

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Old 05-22-2008, 07:22 PM   #13
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Anything further Henry? Being new-ish to the US scene, I don't know much of the background to the Contender, other than it is a really cool looking model and obviously a great flying design - TopFlite are pretty good at this, I understand.

I think I have the hang of basic e-power conversion by now, but I've never had a trike gear'd electric. Come to count up, I've only had three trikes since I got my first radio in 1979, and one of them was in desperation. Main thought - did you use the kit length UC legs, and do they clear your 12" prop okay?

Tommy - your E-Kaos is a beauty too. I've long had the plans to that, and despite whatever I do to it, it still only looks good with the trike UC.

Thank you for some great images - if you have any high-res ones lying around, I know an international e-power model mag column that would really be a good spot for them

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Old 05-23-2008, 01:10 AM   #14
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Default Contender

Dereck, I used the kit supplied landing gear and the recommended dia wheels. I fly out of my backyard and with the 14 inch prop I have to keep the grass mowed close. The 13x10 prop works good and gives slightly more clearance. Just came in from flying it. What a blast. Fast, Quiet,and Clean.
Henry
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Old 05-23-2008, 02:00 AM   #15
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Thank you for the info Henry, you have done a grand old design proud.

Wish I had a backyard that big!

No - let's be realistic. I don't even want a backyard, unless someone invents grass that stops at 3/4". In the meantime, I'll go to my club - that site's got a tarmac strip

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Old 06-05-2008, 03:36 PM   #16
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The Contender is a real beauty! Just the inspiration I need to get back to working on my current conversion project..

Matt

Down with Gravity!
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Old 06-05-2008, 07:07 PM   #17
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Makes me wish my Contender was still around...

I know they make them again - I really should pick one up...

Mike
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Old 06-08-2008, 03:26 AM   #18
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One has to wonder.... will they ever ARF the Contender?

Tommy D

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Old 06-08-2008, 04:27 AM   #19
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I wish they would make it 10% smaller and 25% lighter so that it is more of a natural e-powered plane! (I e-mailed them to suggest this months ago. I haven't heard back... Not that I was expecting a reply! LOL)

Ben
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Old 06-08-2008, 02:04 PM   #20
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Originally Posted by btsai View Post
I wish they would make it 10% smaller and 25% lighter so that it is more of a natural e-powered plane! (I e-mailed them to suggest this months ago. I haven't heard back... Not that I was expecting a reply! LOL)

Ben

Why don't you scale the plans down and do it.
Do a build thread too.
Staples can do it in minutes.

I scaled a set of Taurus plans to 70% lightened the structure and I have a nice flying 2 pound Taurus.

Doing that with the Contender is a good idea, maybe I'll put that on the list of things to do too.
I already have the original plans.

Paul
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Old 06-08-2008, 02:51 PM   #21
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Where can I get the plans?
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Old 06-08-2008, 04:54 PM   #22
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Originally Posted by btsai View Post
Where can I get the plans?

PM sent.
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Old 06-10-2008, 07:38 PM   #23
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'IMAA legal' 70% scale is good fun. I once 'designed' a 9/14ths full size Smog Hog, by hand-drafting a plan from the 1/7 scale reproduction of the full size plan in the UK's dear old "Aeromodeller" mag. Arrived at 9/14 by scaling up the plan from its one page size reduction - they always gave the reduction scale and showed the whole plan back then - by 4.5 times. It was a great flier at around 54" span and flew on variously, an OS20 FS, OS 25FP (Weee!!!) and a PAW 19D RC diesel. The latter was its ruin, as burnt diesel fuel rots everything in its path. Poor thing fell apart before I could get to electrocuting it.

The Contender, with its big, low AR wing, would be a good candidate for a large scale model. Also, most glow ships of its era were massively over-built, so a little structural re-shuffle inside the outlines would be good for improving flying performance.

After all, a lighter model is still the cheapest performance upgrade

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Old 06-10-2008, 08:31 PM   #24
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Default Contender

I wish that I had taken some pictures before covering. I did extreme lightening from the CG aft. There was very little I could remove from the fin and stab. Also completely eleminated the balsa blocks up front in favor of a cowling made from panty hose and epoxy. I am sure it flys much better than the 60 powered one I had when they first came on the market.
Henry


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Old 06-11-2008, 04:31 PM   #25
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Weight reduction is fast becoming a long-lost science!

After I reviewed Great Planes' CAP 232 kit as a conversion for EFI over in England, I effectively built another! Ended up, I propped the cowl and rudder over the plan and put my own structure between them, using GP's shape - it was a great flying model, BTW.

It's a while back, but I do recall reducing the main spar weight alone by 50%, from the kit's 4oz for the four 'hardwood' 5/16" square spars to 2oz for the 1/4 x 1/8 spruce, doubled to 1/4" sq. out to 1/3rd span.

Must have done something right - the model's still airworthy and fast approaching its tenth birthday, though not in my hangar any more.

I took some six ounces off the primary fuselage sides too, going from Liteply to spruce / balsa stripwood side with 1/64" ply doublers.

Am presently working on a 50" span "KEos" - bet you can figure out what's the inspiration there - for a high performance aerobatic ship back of an AXI 2826/10 on 4S. Target weight is 4lb. For a full scale Contender on LiPo, would be looking at 4.5lb - the trike gear would add some weight over my usual taildragger setup.

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