What DLE Gasser for 25% Cub J3
01-10-2016, 08:44 PM
#1
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What DLE Gasser for 25% PA-18 Super Cub
Hi Guys,
I just picked up 1/4 scale Cub airframe, not sure of the mfg. It had a brick of a motor mounted on it (US Engines 41cc) that I did not buy. After some searching I like the DLE engines, would love to mount a 40cc twin but, I'm thinking this might be overkill. The second thought is a 35RA. Both would fit without issue.
So what DLE would you choose for this Cub?
Edit - it's a Dynaflite PA-18 Super Cub.
I just picked up 1/4 scale Cub airframe, not sure of the mfg. It had a brick of a motor mounted on it (US Engines 41cc) that I did not buy. After some searching I like the DLE engines, would love to mount a 40cc twin but, I'm thinking this might be overkill. The second thought is a 35RA. Both would fit without issue.
So what DLE would you choose for this Cub?
Edit - it's a Dynaflite PA-18 Super Cub.
Last edited by Capt Crunch; 01-11-2016 at 07:50 PM. Reason: Wrong info
01-11-2016, 07:47 PM
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Maybe for a lighter Hanger 9 but, 20cc seems small for this Cub. Just found the specs and its actually a PA-18 Super Cub. Dynaflite says it's a 15-17 lbs plane when finished.
I have a couple YS1.40 (22 cc) nitro engines and I think they are too small for this plane. I do like to over power things though. This is just my opinion but, I think it doesn't make sense to go much bigger than 1.40 on nitro or smaller than 25 - 30 cc on gas. With the possible exception of CDI converted nitro engine running nitro fuel. My opinion is based on the power to weight ratio and fuel consumption. Again this is just an opinion and I could be wrong.
I have a couple YS1.40 (22 cc) nitro engines and I think they are too small for this plane. I do like to over power things though. This is just my opinion but, I think it doesn't make sense to go much bigger than 1.40 on nitro or smaller than 25 - 30 cc on gas. With the possible exception of CDI converted nitro engine running nitro fuel. My opinion is based on the power to weight ratio and fuel consumption. Again this is just an opinion and I could be wrong.
01-12-2016, 04:00 AM
#8
I think the Dynaflite PA18 is a few pounds heavier than a Sig or BUSA 1/4 scale and if I recall it was designed around the US 35 engine so I would use at least the DLE 35ra although you my need a bit of nose weight to get the c.g right
01-12-2016, 07:53 AM
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CK1 - It's good to hear from you, sounds like you are familiar with this bird. I'd be willing to bet that it has twice the wood of a modern kit. I really don't like adding non functional weight for balance so I would opt for a larger engine, a bigger battery, etc. That's why I'm trying to plan ahead by seeking the experience of my peers. So what do you think about the DLE 40 twin? It's still a half pound or so lighter than a US 35.
01-12-2016, 08:18 AM
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I own a DLE 40. I have it mounted on a Great Planes Giant Stick. It is a powerhouse. For a quarter scale cub I think it would be to much. Also I am not sure how well that would fit in the cowl. I think Cubs look better flying in a scale appearance than a rocket ship. That is why I suggested the 30cc RCGF. Take a good look at that engine as I think it's a better match for that Cub.
01-12-2016, 10:13 AM
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Superfli - I checked the RCGF site and see a 32cc single and a 30cc twin. Which one were you thinking of? My initial thought is that RCGF doesn't "appear" to have the same level of engineering and quality as DLE. They look more utilitarian I guess is way to put it. Your points on the DLE 40 are valid but this Cub is also 3 - 4 pounds heavier than your Giant Stick and about a two foot longer wingspan. If I went with the 40 twin the heads would extend about a inch outside the cowl. While that's not scale, it's sort of Cub-ish looking. Although, it might be a rocket as you stated with the twin. The 35RA will fit under the cowl without issue.
The VVRC 40 has my interest perked but, it's also out of stock. It about the same size as DLE-40 and a lot lighter. Their 20cc stuff is too small for this plane in my opinion.
The VVRC 40 has my interest perked but, it's also out of stock. It about the same size as DLE-40 and a lot lighter. Their 20cc stuff is too small for this plane in my opinion.
01-12-2016, 10:32 AM
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A DLE 30 or 35 is hard to beat in a CUB. They fit well and have plenty of power, yet throttle well for those who want scale flight performance. About the only negative might be their light weight if the plane is a bit tail heavy. If the plane is quite tail heavy, I'd probably go with something like a Zenoah G26 or even G38 for the extra weight.
01-12-2016, 11:47 AM
#16
The DLE 40 twin is a good engine although I'm not sure of the width issue of fitting it within the cowl. I feel the vvrc in cm6 or 1/4 -32 plug versions will be more narrow than the dle
01-12-2016, 12:16 PM
#17
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Keep in mind, with any gas engine that uses an electronic ignition, you'll have to find a place to locate the ignition box. CUB / Super CUB cowls don't lend themselves well to locating the box on the engine side of the firewall so it usually has to go behind the firewall with the plug lead(s) running through a hole(s) to the plug locations. This is relatively easy to accomplish on a single cylinder engine but will require a bit more thought on a twin. Not a problem, just a consideration you may need to address. I've attached a photo of a SIG CUB with a DLE 35.
01-12-2016, 02:17 PM
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In this link there is a lot of discussion of engine choices. This page down to post #1853 is the one I like.
http://www.rcuniverse.com/forum/arf-...er-cub-75.html
In the ARF RTF forum page 75 post #1853 is the VV 40 installed in a H9 1/4 Scale Super Cub. The twin lets you keep the oil cooler and air opening. Sweet...................
Although your cowl looks pre-butchered.
http://www.rcuniverse.com/forum/arf-...er-cub-75.html
In the ARF RTF forum page 75 post #1853 is the VV 40 installed in a H9 1/4 Scale Super Cub. The twin lets you keep the oil cooler and air opening. Sweet...................
Although your cowl looks pre-butchered.
Last edited by kmeyers; 01-12-2016 at 02:20 PM.
01-12-2016, 02:44 PM
#19
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I believe the cowl on the old Dynaflite kit is a bit smaller and narrower than the Hanger 9 Super Cub. At least if my memory still serves me correctly. It might be worth getting actual dimensions before making a final engine decision. If it would fit, a twin would certainly be nice. The cowl on the plane on the first post doesn't look much like any Super Cub I've seen. The air openings (still closed) are not close to the right shape. Maybe the Hanger 9 ARF cowl could be adapted to the plane then you know the VV twin would fit as its been done before and documented in various threads.
01-12-2016, 09:52 PM
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Think I'll go with the DLE-35. The 40 twin is cool but maybe I'll save that for another plane on another day. I've had some Ugly Sticks in my day and I'm sure that Superfi's Giant Stick with the DLE-40 is insane. However, I would turn it into a low wing Giant Sweet Stik. Back to the PA-18 the 35 seems more than adequate and it fits well in the cowl so it should be a sleeper with scale appearance. Thank you all for the suggestions and advise.
