Maxam

My Feedback: (62)

Hey Roger, Tom here. If it is a good engine, KEEP it and use it on another plane! A robinhood 99 would be fun. Any largish plane like that Waco from HobbyLobby....

Heli-NuBee

Hey Maxam (Tom) good to hear from you. Yes, the engine is in excellent condition. I am also considering puting it into a plane that does not require retracts such as a Yak, Stinson or other similar aircraft. I have had good luck with my three cylinder Saitos and my HK five cylinder on the GP Stearman but not so much luck with the BH Corsair because of the weak retracts and retract mounts.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

Heli-NuBee

OK, I have decided to keep my UMS Evo- 7-77 engine. I just ordered a new plane that was on sale and cost less than replacement retracts for the Corsair.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

Maxam

My Feedback: (62)

That is good news Roger.

BobH

My Feedback: (2)

Has any one had much success running this engine without the exhaust ring? I'm struggling still to get my engine running and stay running at a decent speed.

cymaz

Yes, though it threw oil everywhere so I went to the exhaust ring. I have the sonic Tronics on board system ...great bit of kit. Really impressive when you can hand start it!

Ted62

My Feedback: (2)

Although I have the ring, I had trouble at first trying to get the engine to rev much about 3000 rpms - it would act like it's starving for fuel. Someone (on this forum I think) suggested enriching the low speed needle valve a little and that worked! I only turned it maybe 1/4 turn counter-clockwise. Give it a try!

BobH

My Feedback: (2)

I'll give that a try on the test stand,
Thank you.

Heli-NuBee

It has been awhile since I have posted anything so I thought it may be time for an update. I purchased a Howard DGA-12 from Kangke and have been slowly assembling the plane for my UMS Evolution 7-77 radial engine. The real Howard was powered by a seven cylinder radial so this build will be close to real scale. As always, there have been some challenges in assembling this plane but it is coming along. One of the issues I still face is if I can somehow get the cowl to fit. Kangke indicated the cowl diameter was 12" but when the plane arrived the cowl only measured 10". I am not sure that I can get to cowl to fit at all but I may be able to split the cowl and make that work. I will post pictures in the near future.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

Maxam

My Feedback: (62)

Bob, I confirm that, richen the low needle. Roger, I looked at that plane at Toledo. Should fly well. How can anyone be off two inches measuring a cowl???? -Tom

Heli-NuBee

Hey Maxam (Tom) it is great to hear from you. Yes, I sent an e-mail before purchasing the Howard asking the cowl diameter and the response was 12". However, the actual diameter is only 10" which is very tight. The cowl mounts with a ring glued to the inside that makes it impossible to get over the engine unless the cowl is split or some other method is used. I may just forget about the cowl though, because that seven cylinder radial sure looks great on the front of the Howard.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

tsnaylor1964

Hey Rodger, I built the Kangke DG- 12 myself and was surprised at the quality of the airplane for an import arf. I put the evo 77 on it and was able to get the cowl on with some retrofitting but it was such a pain to pull the lower plugs for after run draining of the cylinders I chose to leave it off. Besides, it looked really good with the engine exposed. Couldn't use those beautiful wheel pants either because I had to go to much larger wheels and tires to fly off my rough ranch strip. I also had to beef up the landing gear with some home made struts because the weight of that engine was too much for the stock gear. After several attempts to get off my high elevation airstrip I decided I needed more power so I put the evo 99 on it. The good news is it was plenty of power to get off the ground. The bad news is my 68 year old reflexes were not fast enough to counter the torque to the left after lift off and it cartwheeled into the ground completely destroying the airplane. In 40 years of flying rc and full size aircraft it was the most spectacular crash I have ever had. Fortunately, I was able to walk away and the engine was spared to fly in another airplane some day.
Tom N

Heli-NuBee

Hey Tom N, thanks for the input. I will keep my fingers crossed that I will have a bit better luck with my Howard. We fly off of a 650' asphalt runway so I hope the 7-77 will have enough power for good take-offs. I may have to beef up the landing gear though because the engine is heavy.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

tsnaylor1964

Hey Rodger I think you will be fine on the asphalt runway and at a lower elevation where I think you are. I live on my horse ranch up in the Sierra mountains for 6 months of the year and the elevation is 5700' so the performance of my airplanes is greatly reduced plus my runway is just a grass pasture so I don't have real smooth surface to take off on.
I had to put a lot of weight in the tail of the Howard to get the cg right so I put my ignition and receiver batteries back there and I still had to add some lead since those evo radials are so heavy. It weighed 25 pounds with the 99.
Tom N

Heli-NuBee

Hey Tom N, sorry to hear that you lost your Howard. We are near sea level here in the California central valley so the 7-77 should do the job. I had the engine in a BH Corsair but landing gear issues caused me to give it up and go to a fixed gear type airplane. I will also have to add weight to the tail even though I have placed as much as possible weight to the rear. I even moved the rudder servo to the back rather than using pull pull on the rudder.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

CzDavec

Hi Guys, Have a quick question regarding glow fuel for the radials . I have the corsair almost finished and am ready to break in the engine. I can purchase methanol , no problem and can buy Klotz techniplate oil. However in the interest of keeping things simpler, would it be possible to just use a gallon of Cool Power 10% (which according to Morgan fuels website has 17% synthetic oil) and mix it with one gallon of straight methanol ? The Omega I typically run has 20% oil content and is a blend of synthetic and caster oil . Also what do you guys recommend as a good prop for the initial running in ? Thanks in advance.

Dave

Ted62

My Feedback: (2)

Hi Dave - You're going to love the radial. Mix your 17% with a gallon of methanol and it'll take it down to around 8% which should be pretty good. My engine's broken-in and am using 7% of homebrew (methanol+Klotz). I used a 24X8 for break-in. I built a power pack out of 6 NiMH cells wired in parallel to supply the 15 amps needed to light the plugs. Good Luck!

cymaz

I buy 16% nitro fuel which has 18% oil content. I cut it with methanol...50/50 mix. Runs great.

CzDavec

Thanks Guys, That was what I figured but wanted to vet it with you guys first. I am not used to an engine that uses such a low oil content . Buying the Cool power and mixing it down with the methanol is an easy way to go . Keeps things simple . I have the Mcdaniels system for the engine but I am hoping it won't need it after break in . It would be nice not to have to carry 2 large battery packs . Tom says his run good without using on board glow but we'll see .
Thanks

Dave

chorner

IMO the closer to 7% oil the better. Less worry about fouling plugs, and less soggy idle/transition etc. all the way up to full throttle. I was running 9% oil for a while, and found 7% much more reliable - if you're looking to run without and glow support, I'd then especially drop the oil content in my opinion

CzDavec

Thanks for the input. I can work the math and blend the fuel down a little bit more to get closer to the optimum 7% . I figure a touch more oil in the mix won't hurt for the initial break in on the test stand but I want to have it running as good as possible for the maiden flight. Nothing like having an unknown plane plus an unknown engine ! I test fly planes for people all the time but this one is going to make me nervous . Funny how that works when it's your plane . :-/


Dave

Heli-NuBee

It is time to post a few teaser pictures of my UMS Evo 7-77 radial engine powered Howard DG-12 airplane. The build is nearing completion and I hope to have the maiden flights on this plane next Wednesday.



Best wishes and good safe flying.

Heli=NuBee (AKA Roger the radial rabbit)

Maxam

My Feedback: (62)

Boy Roger, I have to admit, that plane with that engine un cowled, looks really good. Perfect size match! I look forward to hearing how it flies. -Tom

Heli-NuBee

OK, the maiden flights of my Kangke Howard DGA-12 went very well. The plane flies great and the UMS Evolution 7-77 radial engine ran great. I am quite pleased with this combination. Here are a few pictures of the maiden flights.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)

Heli-NuBee

Here are a few more pictures of the Howard DGA-12 at our field.

Best wishes and good safe flying.

Heli-NuBee (AKA Roger the radial rabbit)