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  1. #151
    Dash7ATP's Avatar
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    RE: Balsa USA enforcer

    Hi guys,


    Let me make a few comments on the fuel line size with the OS .91 VRDF engine. I have been flying ducted fans with this engine for over ten years and have listened to a lot of opinions as well as seen a few results. My first comment is to use as large a fuel line as possible. I realize you can blow or suck a reasonable amount of fuel through a standard fuel line. However, the most critical time in the life of a model is when the engine is at idle, or throttling up from a long idle. It was suggested a long time ago to use nothing but 1/8" I.d. fuel line on the OS.91. This gives minimum resistance to flow at all settings. I have gone to 1/8" I.D. brass tubing in the tanks and drill out the clunks to fit them. Also, I/8" silicon tubing on everything else. For what it's worth, BVM recommends a hard, large ID, tubing for the pressure line for the reasons listed below.

    The other concern is the size of the pressure line from the pipe. It should also be large ID for the same reasons. The other concern with the pressure line is how quickly the carb sees the pressure change due to a throttle change. If you throttle up quickly and the pressure line is too small, it takes time to pressurize a nearly empty tank due to the large air volume. It will also not allow the same tank to vent back into the pipe in a sudden power reduction, so all of the tank pressure is still forcing fuel into the carb even though you are now at idle. Think about it.

    One thing is for sure. If you can't get the engine to go rich at full throttle, the fuel line/s is too small.

    Joe
    "When you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

    AMA # 8870, Member since 1978.
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  2. #152

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    RE: Balsa USA enforcer

    Here is a plane that I built that is simular to the Enforcer

    Its called a Clymax Delta, RCM plan 1142

    I am now working on another Laddie M design called the Arrow RCM plan 1335, check out the progress at

    http://www.rcuniverse.com/forum/m_15...tm.htm#1553735

    SGG
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  3. #153

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    RE: Balsa USA enforcer

    Well Work continues, almost everything is fitted. working on the pipe tunnel.
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  4. #154

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    RE: Balsa USA enforcer

    Hey how about those leading edges!! ya cant leave em forever ya know

  5. #155

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    RE: Balsa USA enforcer

    Air brakes!!

    I do the shaping durring the final sanding, if I were to have shaped the leading edges they would be dinged and dented and I'd have to fix them. Anything that gets messed up now will be gone with the final sanding.

  6. #156

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    RE: Balsa USA enforcer

    What i am looking forward to is a break down of the covering especialy over the wing with piccys (any takers guys) Im dreading the propellor slot. And as the body has so many curves ill spray mine after some kind of sealant is applied and sanded back. The problem here is of course is finding paint that matches the film colour.

    I just aint gonna try n wrap film round that fuzz []

  7. #157

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    RE: Balsa USA enforcer

    I didn't have too much trouble covering the slot. Just start with the smallet pieces of covering first, specifically fold some 1/4 inch strips longways and iron them on along the inside corners. You want a good seal there because that is where all the engine oil collects.

    Speaking of the slot, don't use it as a handy place to pick up your plane when you do a power check. I lost an inch of my pinky a couple of months ago with that stupid move.
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  8. #158

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    RE: Balsa USA enforcer

    I once saw a dog put its nose in the prop of a trainer and cut it clean off and was lying on the ground as the dog bolted while yelping. As to the prop slot ill make sure its well fuel proofed inside before any film is put on.

  9. #159

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    RE: Balsa USA enforcer

    Are there plans for the A-4???

  10. #160

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    RE: Balsa USA enforcer

    The A-4 is a byron fiberglass airframe with built up wings, it was mostly built when I picked it up and no I don't have any plans or instructions for it.

    WE don't need any stickin instructions

    I'll go to work on it one day if I ever get a work bench cleared of.

  11. #161
    CARS II's Avatar
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    RE: Balsa USA enforcer

    Hey guys here is my progress so far, kind of slow on the building but is getting there.
    I have the fan positioned at the location where it will go I'm trying to keep it closed to the CG to get a good balance at the end, also you can see the shape of the fuse. in front of the fan for better air flow and the fuse. has moved forward about two inches it will be glued to the wing after the wing gets sheeted, the retracts will come soon.

    CARS II
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    Carlos R
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  12. #162
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    RE: Balsa USA enforcer

    Here you get to see the fan mount and the vibration isolators just and added convenience to keep the vibration down.


    CARS II
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    Carlos R
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  13. #163
    CARS II's Avatar
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    RE: Balsa USA enforcer

    Livinabox, What time is it in the UK.

    CARS II
    Carlos R
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  14. #164
    CARS II's Avatar
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    RE: Balsa USA enforcer

    mobileraptor your up, how about those leading edges? I was thinking of adding another leading edge in front of the first one to get a sharper leading edge and may be this will give me more speed.

    What do you think?


    CARS II
    Carlos R
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  15. #165

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    RE: Balsa USA enforcer

    just caught the message as my sound is off ..its 7:53 am ..and im back off night shift

  16. #166
    CARS II's Avatar
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    RE: Balsa USA enforcer

    Well have a good day/night, I'm off to bed too. 12:00 AM here.

    CARS II
    Carlos R
    Citabria/Decathlon Brotherhood # 1
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  17. #167

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    RE: Balsa USA enforcer

    And now its 8AM .....hey do i get some wages here for being the speaking clock.

    OOps off topic sorry guys.

  18. #168

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    RE: Balsa USA enforcer

    Ok forget the wages ...jus send all ya spair nitro here as its £60 a gallon.

  19. #169
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    RE: Balsa USA enforcer

    Don't forget. !!!!and its all clear.!!!!!!
    Carlos R
    Citabria/Decathlon Brotherhood # 1
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  20. #170
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    RE: Balsa USA enforcer

    60.00 a gallon, that will definitly kill us as it is we are crying our longs out because the gallon of gasoline is over $2:00 here in CA
    Carlos R
    Citabria/Decathlon Brotherhood # 1
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  21. #171

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    RE: Balsa USA enforcer

    You folks in the US have it easy ....gallon of gas here is nearly £4.80 ..thas around 3 to 4 times the price.

    Ill never own a dragster []

  22. #172
    Dash7ATP's Avatar
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    RE: Balsa USA enforcer

    Cars II,

    What fan is that? It looks like a JHH fan. And what engine? This is the first post I have seen on this particular plane.

    I would highly recommend that you add light ply doublers to the wing ribs where the fan mounts attach. At least on the opposite side of the ribs, full height and for about four inches past the ends of the fan mount. You will be seeing a lot of stress on the mount as you start the engine, as well as some pretty good loads on the mounting ribs if the airframe ever comes to a sudden stop ( and sooner or later, that will probably happen-not neccessarly in a crash).

    Good luck.

    Joe
    "When you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

    AMA # 8870, Member since 1978.
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  23. #173
    CARS II's Avatar
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    RE: Balsa USA enforcer

    Dash, You are right it is a JHH Turbax/K&B 7.5 combo, this engine will be hard to find now days, I have a new one as a back up engine.
    I totally agree with you on the reinforcement, that is what I will be doing this weekend, I will be adding two half light ply ribs, 1/4'' bass wood rails and will doubling ribs #2.

    I have some experience with a Balsa nova that I did some time ago.

    I will be posting pictures of it after it is done, any subjestions will be apreciated


    CARS II
    Carlos R
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  24. #174
    Dash7ATP's Avatar
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    RE: Balsa USA enforcer

    "any subjestions will be apreciated"

    More POWER!


    Joe
    "When you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

    AMA # 8870, Member since 1978.
    Waco Brotherhood # 219.
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  25. #175
    CARS II's Avatar
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    RE: Balsa USA enforcer

    Copy and willco on the power I have two OS 91s and one K&B 82 for later use on this airplane but for now the K&B 7.5 is it.


    CARS II
    Carlos R
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